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Capital Weather Gang: September, 2011

Posted at 03:57 PM ET, 09/30/2011

PM Update: Rush of cool autumn air arriving; showery weekend

The cloudy, moldy month of September is thankfully about history, but October’s opening isn’t exactly promising. Cold air piles in tonight. Then an energetic disturbance aloft follows and stalls over the region for the weekend. That means a blustery, unsettled Saturday and perhaps more of the same Sunday.

By Jason Samenow  |  03:57 PM ET, 09/30/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:40 PM ET, 09/30/2011

Typhoon Nalgae (Quiel) bears down on northern Philippines reeling from Nesat

Just four days after Typhoon Nesat (locally known as Pedring) ripped across the northern Philippines, a second dangerous typhoon threatens the same region. Intensifying Typhoon Nalgae (locally known as Quiel) is poised to tear through the northern part of Luzon island tonight (Saturday morning and afternoon local time).

By Jason Samenow  |  02:40 PM ET, 09/30/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather, International Weather

Posted at 11:58 AM ET, 09/30/2011

Ophelia becomes major hurricane; update on Atlantic season

Hurricane Ophelia, a mere remnant wave early this week, has made a remarkable recovery, reaching the major category 3 level today. About 620 miles south southeast of Bermuda, its maximum winds are 115 mph. Short term fluctuations in intensity are likely over the next day before a gradual weakening. Its western periphery could just clip Bermuda Saturday, and a tropical storm watch is in effect. Ophelia is one of the 16 named storms (and one additional tropical depression) in this Atlantic hurricane season, the second busiest (to 2005) on record at this point. But in this season’s batch of 16 named storms, there have been only 4 hurricanes, three of which (including Ophelia) have reached major status (category 3 or higher). And Colorado State researcher Brian McNoldy notes this is a record low number of hurricanes for such a larger number of total storms.

By Greg Postel  |  11:58 AM ET, 09/30/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather

Posted at 10:15 AM ET, 09/30/2011

Mold hits highest September level in ten year record Thursday

On Thursday, the count for mold spores in Washington, D.C. rose to 47,483 spores per cubic meter of air. That concentration was the highest in the U.S. Army Centralized Allergen Extract Lab’s ten year record for September according to Susan Kosisky, a microbiologist at the Walter Reed Army Medical Center lab.

By Jason Samenow  |  10:15 AM ET, 09/30/2011 |  Permalink  |  Comments ( 0)
Categories:  Health, Latest, Local Climate

Posted at 05:00 AM ET, 09/30/2011

Forecast: Decent Friday then much cooler with showers and an autumnal feel

Enjoy today’s prevalent sunshine and warm temperatures before weekend clouds—and even showers—return to make it feel fully like fall. Next week really could produce some gems though! Just hold out. And go looking for or start unpacking those autumn jackets so that you can dress in layers Saturday and Sunday until we get some sun and warmth back for our workweek!

By A. Camden Walker  |  05:00 AM ET, 09/30/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:49 PM ET, 09/29/2011

PM Update: Dry, refreshing air streams in and SOME SUN!

After day after day of mostly cloudy skies, high humidity, mold, and a whole host of other unsavory elements, we can now say: SEE YA! A dry wind from the west has overtaken the tropical southerly flow, showers are fizzling and the air is cooling. A pleasant evening and fine Friday are in the pipeline.

By Jason Samenow  |  03:49 PM ET, 09/29/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:13 PM ET, 09/29/2011

Snowflakes possible in nearby mountains Saturday

A major fall cold front will send temperatures tumbling Friday night. And as a cold pool of air aloft flows across the elevated terrain to our west, yes, some snowflakes may fly between late Friday night and Sunday morning.

By Jason Samenow  |  02:13 PM ET, 09/29/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Winter Storms

Posted at 12:15 PM ET, 09/29/2011

Fall is here, but for gardens, time to think about next summer...

If you feel like our climate has shifted to rain forest, you are not alone. The damp mild weather is not a novelty here but the persistence has been. However, for those of us close to D.C., would you believe that over the past two weeks (prior to last night), our rainfall has been nearly an inch below normal? There is probably no need to run for the sprinkler as temperatures have been mild and humidity levels high. Last time we spoke it was to prepare for spring bulb planting. Today, we go even farther into the future and think about summer bulbs.

By David Streit  |  12:15 PM ET, 09/29/2011 |  Permalink  |  Comments ( 0)
Categories:  Environment, Local Climate, Latest, Gardening

Posted at 10:13 AM ET, 09/29/2011

Jefferson’s lightning!

It rained hard for about 15 minutes. When the storm was over, I almost decided to drive home. It appeared the thunderstorm had fizzled, I did not see any lightning.

Then, I noticed a flash of lightning on the eastern horizon. There was no thunder, it was distant lightning.

I walked down to the Tidal Basin and setup my tripod. The visibility was good. The next lightning bolt appeared clearly in the sky over the Jefferson Memorial and I captured it with my digital camera, a Sony A580. I am always happy if I can photograph one lightning bolt. Just one.

By Kevin Ambrose  |  10:13 AM ET, 09/29/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Photography, Thunderstorms

Posted at 05:00 AM ET, 09/29/2011

Forecast: Showers still possible today, much cooler weekend

Everyone brace yourself: drier air is on the way. In fact, by this evening it will start to be quite noticeable. Before the drier air arrives, some day time showers are possible so don’t give up the umbrella yet. Then it’s downright chilly this weekend.

By David Streit  |  05:00 AM ET, 09/29/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:15 PM ET, 09/28/2011

PM Update: After sun’s rare appearance, a shower and storm risk

Following what might be the sunniest day area wide in about two weeks, we’re waiting on any showers and t’storms that might cap the day. While sun can help destabilize the atmosphere, we also need an atmospheric “trigger” to fire up storms and so far it seems there is no large-scale one. Temperatures responded to the sun by reaching highs near and above 80 most spots.

By Ian Livingston  |  04:15 PM ET, 09/28/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:40 PM ET, 09/28/2011

Weather forecast for pivotal Major League Baseball wild card race games

Four key major league baseball games tonight have big playoff implications. Will weather be a factor? Well, not in Tampa, where the Rays-Yankees game will be played under a dome. But in nearby Baltimore as well as Houston and Atlanta, the games are in the open air, so let’s look at what to expect...

By Jason Samenow  |  03:40 PM ET, 09/28/2011 |  Permalink  |  Comments ( 0)
Categories:  U.S. Weather

Posted at 02:52 PM ET, 09/28/2011

Solar storm smashes into Earth, stunning aurora at high latitudes

Did you know the high latitudes experienced a severe geomagnetic storm Monday which still lingers? At the mid-latitudes, the storm was moderate, but powerful enough for aurora to be seen as far south as New York state.

By Jason Samenow  |  02:52 PM ET, 09/28/2011 |  Permalink  |  Comments ( 0)
Categories:  Astronomy, Latest, Space

Posted at 01:40 PM ET, 09/28/2011

The magical side of the big, pesky upper low

For all of the misery and various plagues (mushrooms, slugs, mosquitoes, etc) brought about by our cloudy, volatile weather pattern, occasionally beauty can be found. Capital Weather Gang Facebook follower Jason Breakiron was in the right place at the right time yesterday evening to capture some amazing cloud forms in the dusk light.

By Jason Samenow  |  01:40 PM ET, 09/28/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Photography, Thunderstorms

Posted at 11:17 AM ET, 09/28/2011

Tropical storm Ophelia regenerates, could clip Bermuda

Once in a great while, a tropical system rises from the dead. Count tropical storm Ophelia among the resurrected as of this morning. Located 215 miles east of the northern Leeward islands, its maximum sustained winds have grown to 50 mph. It’s currently drifting north-northwest at 3 mph but an increase in forward speed is forecast.

By Jason Samenow  |  11:17 AM ET, 09/28/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather, International Weather

Posted at 05:00 AM ET, 09/28/2011

Forecast: Seattle-like September dials up yet another cloudy day; more rain, too

Thank goodness we’re in the homestretch of what’s gotta be one of the gloomiest Septembers of all time. Mother Nature doesn’t seem to be in any hurry to clear out the clouds. We’re not done with those pesky shower/storm chances, either. Can we at least get some sun in here for the weekend?

By Dan Stillman  |  05:00 AM ET, 09/28/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:46 PM ET, 09/27/2011

PM Update: Scattered showers and storms staying alive

The cold front associated with lumbering upper level low near Chicago mo ves little over the next day. Out ahead of it over the mid-Atlantic, a stream of moisture from the south keeps flowing, meaning more clouds, tropical humidity, warm temperatures and periodic showers and storms.

By Jason Samenow  |  03:46 PM ET, 09/27/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:01 PM ET, 09/27/2011

Washington D.C.’s wettest stretches: how do August and September compare?

With deluge after deluge over the past one to two months, just how wet has it been in Washington compared to past rainy periods?

By Jason Samenow  |  03:01 PM ET, 09/27/2011 |  Permalink  |  Comments ( 0)
Categories:  Local Climate, Latest

Posted at 01:05 PM ET, 09/27/2011

Typhoon Nesat pounds Philippines, heads for south China

Typhoon Nesat crashed ashore the northern Philippines last night with peak sustained winds between105-120 mph. The powerful storm killed at least seven people according to reports. The storm made landfall at 4 a.m. local time in the northern provinces of Aurora and Isabela on Luzon Island.

By Jason Samenow  |  01:05 PM ET, 09/27/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather, International Weather

Posted at 10:48 AM ET, 09/27/2011

An immaculate mid-latitude cyclone and its decay

Behold one of the most beautiful satellite views of a mid-latitude cyclone you will ever see.

By Jason Samenow  |  10:48 AM ET, 09/27/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Science, Photography

Posted at 05:00 AM ET, 09/27/2011

Forecast: Swampy showers today; chilly weekend weather ahead

Our heavy humidity atmosphere will only worsen today with showers and thunderstorms throughout the area. Showers continue into tonight with yet more shower chances through the balance of the week. Temperatures range from the upper 70s to low 80s during the day, but a stronger cool push arrives by Friday (70s) and the weekend (60s for highs).

By Matt Rogers  |  05:00 AM ET, 09/27/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:15 PM ET, 09/26/2011

PM Update: Still lots of clouds around, and more rain showers on the way

Today’s highs near 80 were accompanied by lots of clouds (what’s new there, right?). Overnight we see more clouds and possible fog forming by morning along with muggy readings mainly in the 60s. Rain odds go back up tomorrow, but it should not be an all-day rain.

By Ian Livingston  |  04:15 PM ET, 09/26/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:36 PM ET, 09/26/2011

“Gray-tember” 2011: Your chance to complain

If you’re missing the blue skies, that’s because the last truly sunny day occurred September 13, almost two weeks ago.

By Jason Samenow  |  03:36 PM ET, 09/26/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Latest, Local Climate

Posted at 01:47 PM ET, 09/26/2011

Tropical storm Ophelia fades; Philippe for the fish; Typhoon Nesat to nail Philippines; Hurricane Hilary to weaken

The globe is alive with tropical activity. Around the world, we find three active named storms (Philippe, Hilary, and Nesat), one tropical depression (Haiting), and two remnant systems (Ophelia and Roke). But with the exception of Typhoon Nesat in the northern Philippines and the remnants of Roke in the Pacific Northwest, none represent an immediate threat to land. Let’s take a quick tour around the world...

By Jason Samenow  |  01:47 PM ET, 09/26/2011 |  Permalink  |  Comments ( 0)

Posted at 11:00 AM ET, 09/26/2011

Newsflash: Climate scientists are different than the general public

A new study examines a fundamental barrier to effective climate science communication: differences in the leading personality types of climate scientists compared to the public. The paper identifies personality type differences between Ph.D. climate researchers and the general public. Researchers hope to use this insight to improve the effectiveness of climate change communication.

By Andrew Freedman  |  11:00 AM ET, 09/26/2011 |  Permalink  |  Comments ( 0)
Categories:  Climate Change, Freedman, Latest

Posted at 05:00 AM ET, 09/26/2011

Forecast: Warm and humid, tough to shake the clouds

Has Washington, D.C. transformed into a tropical rain forest? We’ve gone almost two weeks since the last sunny day, the mosquitoes are thick and mold is fluorishing. Making matters worse, we expect more clouds, showers, and mugginess for the first part of the week. Late in the week, a cold front clears us out leaving sunny, crisp air for the weekend.

By Jason Samenow  |  05:00 AM ET, 09/26/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 05:00 AM ET, 09/25/2011

Forecast: Just a garden of gray

How sick are you of cloudy skies? We’ll get plenty more clouds through the early part of our week and shower chances too, thanks to a pesky, stagnant upper-level low pressure over the Midwest. On the bright side, once a cold front works through the area late Monday into Tuesday, we’re likely looking at much improved conditions for the latter half of the week.

By Brian Jackson  |  05:00 AM ET, 09/25/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/25/2011

NatCast: Mostly cloudy for the home finale

As the Nats try to play spoiler against the Braves, we’ll have to keep an eye on radar to see if a potential area of steadier showers manages to develop or not.

By Brian Jackson  |  04:55 AM ET, 09/25/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 05:00 AM ET, 09/24/2011

Forecast: Clouds remain rather stubborn as rain odds decrease a bit

The heaviest of yesterday’s rain managed to miss parts of the area, but it was not far off. At this point, any rain falling within a few hundred miles might be too close for some! Happily, we might begin to see less rain in the forecast, though it refuses to leave entirely. With a big low pressure still spinning to the west, the coming period continues to be rather constant in its clouds, moderate humidity and chances of intermittent rain.

By Ian Livingston  |  05:00 AM ET, 09/24/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:56 AM ET, 09/24/2011

NatCast: The end is near

The Nats are pretty good at dodging rain considering how often it rains lately. If that doesn’t continue today, whatever falls should not be a washout. It’s also warm, and pretty muggy still.

By Ian Livingston  |  04:56 AM ET, 09/24/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 04:55 AM ET, 09/24/2011

UnitedCast: Mostly pleasant evening?

If you’ve read CWG you know one thing: clouds are our buddies. If that doesn’t bother you, or that plus a slight risk of rain, this should be a pretty solid evening for a game. Comfortable temperatures and moderate humidity meet up with a very light breeze.

By Ian Livingston  |  04:55 AM ET, 09/24/2011 |  Permalink  |  Comments ( 0)
Categories:  UnitedCast, Latest

Posted at 05:02 PM ET, 09/23/2011

PM Update: Heavy rain to taper off tonight; few showers this weekend

Although Baltimore, counties near the Chesapeake Bay, and parts of Frederick county got socked with heavy rain today, amounts tended to be more moderate elsewhere. Along and east of I-95, areas of heavy rain continue this evening but taper off to the west. By late tonight, everyone dries out. Over the weekend, we can’t totally shake the shower chances, but they’re far less numerous than today.

By Jason Samenow  |  05:02 PM ET, 09/23/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 12:44 PM ET, 09/23/2011

Heavy rain and flooding in D.C. metro region: Live updates

A Flash Flood Watch is in effect through this evening as a plume of heavy rain flows through the region from southwest to northeast. A general 2-3” of rain is possible with locally higher amounts. Flash flood warnings are in effect for selected areas. Follow this post for the latest updates.

By Jason Samenow  |  12:44 PM ET, 09/23/2011 |  Permalink  |  Comments ( 0)
Categories:  Floods, Latest

Posted at 11:00 AM ET, 09/23/2011

Rumblings within Indonesia’s Mount Tambora volcano: could eruption bring year without summer?

The eruption of the Mt. Tambora volcano in April 1815 was the largest and most deadly volcanic eruption in recorded history. Its sunlight dimming particles caused a major cooling in the global climate that led to1816’s “Year Without a Summer”. Experts are now saying that Mount Tambora is ready to erupt again as a sequence of earthquakes has been shaking the island at increasing frequency since April. Columns of ash are already venting as high as 4,600 feet.

By Steve Tracton  |  11:00 AM ET, 09/23/2011 |  Permalink  |  Comments ( 0)
Categories:  International Weather, Science, Latest, History

Posted at 05:00 AM ET, 09/23/2011

Forecast: Periods of heavy rain could lead to flash flooding

Please be mindful today, especially if you notice an extended period of heavy rain. With soil still pretty saturated, flooding is again possible, unfortunately. But, even looking past today’s rain which should be the heaviest of the period, the weekend still looks dank and dreary. Yeah, we are all sick of this, right? Same ol’ same ol’. Hang in there. Watch the radar with us and take that umbrella with you.

By A. Camden Walker  |  05:00 AM ET, 09/23/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/23/2011

NatCast: Bravely trying to squeeze in the last evening game of the season

By A. Camden Walker  |  04:55 AM ET, 09/23/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 03:45 PM ET, 09/22/2011

PM Update: Risk of heavy rain, flash flooding Friday

Friday morning brings the beginning of autumn, but we’ll sure be missing the cool, crisp, clear autumn air. Instead, humid, tropical air from the south primes the atmosphere for periods of heavy rain. Given the soaked ground from recent rains, it won’t take that much water to cause flooding and flash flood watch is in effect everywhere but the far southwest suburbs Friday.

By Jason Samenow  |  03:45 PM ET, 09/22/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:45 PM ET, 09/22/2011

Autumnal equinox marks the official start of fall Friday morning

While meteorological fall already began three weeks ago, the autumnal equinox occurs Friday at 5:04 a.m. (EDT), signaling the official start of fall in the Northern Hemisphere. Besides ushering in a new season, the fall equinox marks the time at which the sun shines directly overhead at the equator, which results in nearly equal periods of daylight and darkness at all latitudes. Until the winter solstice in December, the sun will continue its southward migration towards the Tropic of Capricorn, bringing us increasingly shorter days and a lower sun angle in the months ahead.

By Justin Grieser  |  02:45 PM ET, 09/22/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Local Climate, Astronomy

Posted at 01:59 PM ET, 09/22/2011

Farmers’ Almanac: Prepare for “wet, wild winter”

Get ready for a winter of “clime and punishment” says the Farmer’s Almanac. From frigid conditions in the northern tier of the U.S. to very wet and stormy conditions in the East, it predicts the upcoming winter will be an “unusually” tough one. But should we put much stock in this outlook? I’d say just a very little, and will explain.

By Jason Samenow  |  01:59 PM ET, 09/22/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Winter Storms

Posted at 12:00 PM ET, 09/22/2011

Arrowheads emerge from tropical storm Lee’s heavy rain

After Lee’s heavy rain, I made a trip to one of my favorite arrowhead hunting grounds, located on a small creek that flows into the Potomac River near Dumfries, Va. I was thinking that the erosion from Lee might uncover some arrowheads. My assumption was correct. The video in this post shows the hunt.

By Kevin Ambrose  |  12:00 PM ET, 09/22/2011 |  Permalink  |  Comments ( 0)
Categories:  Photography, Floods, Latest

Posted at 10:18 AM ET, 09/22/2011

Video: Awesome aurora Australis from International Space Station

Thanks to NASA and the crew of Expedition 29 on the International Space Station, we’re treated to this surreal video of the southern lights, known as Aurora Australis.

By Jason Samenow  |  10:18 AM ET, 09/22/2011 |  Permalink  |  Comments ( 0)
Categories:  Astronomy, Latest, Photography, Space

Posted at 05:00 AM ET, 09/22/2011

Forecast: Scattered showers feed through area today, heavier rains tomorrow

We need some new alerts for this weather: frizzy hair advisory, mold watch, dripping tree warning. Once again we find ourselves on the wrong side of an upper level low pressure system going nowhere. This is no tropical storm Lee but with a steady flow from the south there will be no moisture deficit.

By David Streit  |  05:00 AM ET, 09/22/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:00 PM ET, 09/21/2011

PM Update: Clouds in no hurry to go anywhere and rain chances headed up

It feels like it’s been cloudy all month. No break in that idea seems to be ahead right away as a storm system continues to spin to our west and push moisture into the area. The next day or so could be wetter than recently as well, too. At least it won’t be cold.

By Ian Livingston  |  04:00 PM ET, 09/21/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:40 PM ET, 09/21/2011

Worst D.C. September weather in memory?

”Wake me up when September ends”: Although that Green Day lyric is so 2005, it probably has entered more than a few minds during this depressingly dim September. So far this month, we’ve had at least a trace of precipitation on 12 out of 20 days. And dismally, we’ve had only four days with more than 50% sunshine.

By Jason Samenow  |  02:40 PM ET, 09/21/2011 |  Permalink  |  Comments ( 0)
Categories:  Local Climate, Latest

Posted at 01:24 PM ET, 09/21/2011

Tropical storm Ophelia forms but forecast to weaken

Tropical storm Ophelia, the Atlantic’s 15th named storm of 2011, formed last night and has slowly intensified over the last 12 hours. Positioned 1245 miles east of the Leeward islands, its maximum sustained winds are 60 mph. Its westward forward speed of 16 mph is forecast to continue for another day before a slight turn to the north.

By Jason Samenow  |  01:24 PM ET, 09/21/2011 |  Permalink  |  Comments ( 0)
Categories:  Tropical Weather, Latest

Posted at 11:05 AM ET, 09/21/2011

Typhoon Roke crashes into Japan

Packing sustained winds of 100 mph,equivalent to a Category 2 hurricane, Typhoon Roke made landfall at 1 a.m. EDT or 2 p.m. local time today in Honshu (south central mainland Japan), between the cities of Toyohashi and Hamamatsu, south of Tokyo. Tokyo experienced sustained tropical storm force winds with gusts reaching 83 mph.

By Jason Samenow  |  11:05 AM ET, 09/21/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather, International Weather

Posted at 05:00 AM ET, 09/21/2011

Forecast: Clouds and shower threat not ready to leave town; a brighter weekend?

Ever since Labor Day came and passed, it seems cloudy days have outnumbered sunny ones. This is, actually, quite common for September, when cold fronts just don’t have enough umph to kick out the clouds. The partly to mostly cloudy and sometimes rainy trend continues the next few days, but the weekend may show improvement.

By Dan Stillman  |  05:00 AM ET, 09/21/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/21/2011

UnitedCast: Plenty of clouds, possibly showers

Rather muggy with a legitimate (about 50/50) chance of showers, maybe a rumble of thunder early, and temps dropping back toward 70.

By Dan Stillman  |  04:55 AM ET, 09/21/2011 |  Permalink  |  Comments ( 0)
Categories:  UnitedCast, Latest

Posted at 05:00 PM ET, 09/20/2011

PM Update: Dry tonight, more shower chances Wednesday

Gosh is the sun hard to come by this September. Even after the morning and midday rains, clouds stuck around along and east of I-95. Some of our lucky western suburbs caught some afternoon rays, but they’ll be fleeting. Wednesday looks like another day with considerable clouds and showers.

By Jason Samenow  |  05:00 PM ET, 09/20/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:58 PM ET, 09/20/2011

Will tropical storm Ophelia form? An Atlantic hurricane season revival?

For the most part, the skies over the Caribbean and Atlantic Basins are remarkably clear. This is not typical, given that we are still near the most active part of the hurricane season historically (which, according to the chart below, was just over a week ago). There is, however, one notable exception to the current –almost thunderstorm free- quiescence over this sector of the tropical atmosphere. The National Hurricane Center (NHC) is keeping an eye on a collection of clouds, identified as AL98, way out in the Atlantic.

By Greg Postel  |  03:58 PM ET, 09/20/2011 |  Permalink  |  Comments ( 0)
Categories:  Tropical Weather, Latest

Posted at 02:50 PM ET, 09/20/2011

Hurricane Irene, tropical storm Lee swamp pumpkins, spawn mosquitoes

Hurricane Irene and the remnants of tropical storm Lee are long gone. Power is restored and flood waters have receded. But unwelcome post storm impacts are emerging. Pumpkin production has been smashed particularly north of the D.C. metro region, and mosquitoes are swarming.

By Jason Samenow  |  02:50 PM ET, 09/20/2011 |  Permalink  |  Comments ( 0)
Categories:  Floods, Latest

Posted at 12:53 PM ET, 09/20/2011

Dangerous Typhoon Roke rapidly strengthens, to rake Japan

Since yesterday, Typhoon Roke has undergone rapid intensification and presents a clear and present danger to large parts of Japan. Maximum sustained winds have increased from 80 to 130 miles per hour in just the last 24 hours. Roke is equivalent to a strong category 3 hurricane.

By Jason Samenow  |  12:53 PM ET, 09/20/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather, International Weather

Posted at 11:00 AM ET, 09/20/2011

Crashing NASA satellite: Are you more likely to be struck by lightning?

Joel Achenbach today wrote that “a 12,500-pound NASA satellite the size of a school bus” will plummet to Earth Friday, give or take a day. He said NASA calculated the odds of the Upper Atmosphere Research Satellite (UARS) hitting a person is 1-in-3,200. Multiply that by the human population of about 7 billion of your odds are about 1-in-22.4 trillion. How does that compare to the odds of being struck by lightning?

By Jason Samenow  |  11:00 AM ET, 09/20/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Space, Astronomy

Posted at 05:00 AM ET, 09/20/2011

Forecast: Warmer out with showers about; weekend weather trending worse

A wind shift today brings in warmth and higher humidity from the south, but the added impact will be more clouds along with likely showers and storms. The warmer weather theme continues into midweek with 80s likely by tomorrow along with more shower/storm chances.

By Matt Rogers  |  05:00 AM ET, 09/20/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:45 PM ET, 09/19/2011

PM Update: Gray skies remain and threaten to spit out some rain

We can’t seem to kick the clouds stuck in the area. The news on that front is not so bright into the near future, as gray skies seem to be enjoying their stay. At least these temperatures are ideal for keeping energy costs lower! Watch out for some increased risk of rain later tonight and then a more general chance tomorrow.

By Ian Livingston  |  03:45 PM ET, 09/19/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:39 PM ET, 09/19/2011

Typhoon Roke charging towards Japan

Less than two weeks after Typhoon Talas claimed at least 54 lives in Japan, the natural disaster ravaged country braces for Typhoon Roke, about 630 nautical miles southwest of Yokosuka.

By Jason Samenow  |  02:39 PM ET, 09/19/2011 |  Permalink  |  Comments ( 0)
Categories:  Tropical Weather, Latest

Posted at 12:06 PM ET, 09/19/2011

Seeking better answers to climate change, extreme weather questions

The United States has suffered from a record number of billion dollar natural disasters this year, from the Mississippi and Missouri River flooding to Hurricane Irene and the Texas drought. With each of these events, many have wondered - did climate change have anything to do with this? Now, climate scientists are considering the launch of an ambitious project to push “extreme event attribution” studies forward.

By Andrew Freedman  |  12:06 PM ET, 09/19/2011 |  Permalink  |  Comments ( 0)
Categories:  Climate Change, Freedman, Latest

Posted at 10:21 AM ET, 09/19/2011

International Space Station time lapse of Earth flyover: clouds, city lights, lightning

Watch this magical time lapse of the International Space Station orbiting Earth, and be dazzled...

By Jason Samenow  |  10:21 AM ET, 09/19/2011 |  Permalink  |  Comments ( 0)
Categories:  Astronomy, Latest, Space, Photography

Posted at 05:00 AM ET, 09/19/2011

Forecast: Gradual warming trend into midweek; unsettled at times

Fall-like weather gradually fades during the first part of the week as the air turns warmer and more humid. With the muggier, summer-like conditions, we add the chance of showers and thunderstorms, particularly Tuesday and Thursday. Fittingly, a cold front passes by just prior to Friday’s fall equinox, when cooler, crisper air starts to arrive.

By Jason Samenow  |  05:00 AM ET, 09/19/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 05:00 AM ET, 09/18/2011

Forecast: Our early fall preview continues

Anyone else not quite ready to say good-bye to summer? If you answered yes, you’ll be happy to know that temperatures are on the rise, though it’s a gradual process with fall still in full effect today as highs struggle toward 70. By midweek we may climb to 80 again, but the price of such warmth could be some showers and storms.

By Brian Jackson  |  05:00 AM ET, 09/18/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/18/2011

NatCast: Fall feel in the air

It’s a cool day at Nats park as our fall preview continues with temps mainly in the 60s. With a little luck we’ll see some sun from time to time, but the cloud forecast is too uncertain to make any guarantees

By Brian Jackson  |  04:55 AM ET, 09/18/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 11:30 PM ET, 09/17/2011

SkinsCast: Cool, but just right for fall football

Pretty ideal football weather: Cool (60s), but not cold mid-September temps and not much wind.

By Jason Samenow  |  11:30 PM ET, 09/17/2011 |  Permalink  |  Comments ( 0)
Categories:  SkinsCast, Latest

Posted at 05:00 AM ET, 09/17/2011

Forecast: Cool temperatures and plenty of clouds through the weekend

We don’t have any big storms to worry about and no summertime heat either. As long as you don’t mind clouds, this weekend should be pretty decent. Expect temperatures to hover below 70 for much of the time during the day to compliment cool nights. Some warmer air may creep back in by the beginning of the week.

By Ian Livingston  |  05:00 AM ET, 09/17/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/17/2011

NatCast: Another cool night under the lights

The weather is reminding us there’s only about a week left of regular season action. It might be a bit warmer than last night’s game, but you’ll probably still want some layers. Expect mostly cloudy skies and maybe an increasing breeze.

By Ian Livingston  |  04:55 AM ET, 09/17/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 03:42 PM ET, 09/16/2011

PM Update: Fall air settles in for weekend

Where did summer go? That was my thought during a brisk lunch time walk today. Through the weekend, the autumn-like weather persists with generally sub-70 temperatures, a chilly easterly breeze and, at times, considerable cloud cover.

By Jason Samenow  |  03:42 PM ET, 09/16/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:18 PM ET, 09/16/2011

Are you ready for fall? Is there any summer weather left?

The onset of fall weather came abruptly last night. After more than 90 days when lows failed to even reach the 50s in D.C., we plummeted all the way into the 40s. And this afternoon’s temperatures are stuggling to reach the mid-60s, the coolest since early May.

By Jason Samenow  |  02:18 PM ET, 09/16/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Local Climate

Posted at 12:15 PM ET, 09/16/2011

Fall is here, but for gardens, time to think about Spring!

Hopefully everyone’s garden survived the deluge from tropical storm Lee’s remnants. We were stuck between a rock and a hard place with all of Lee’s voluminous moisture funneling up from the south and Hurricane Katia offshore, blocking it from progressing out of the area. While the onslaught of rain was one way to break a drought for good, it was probably not the best way. Fortunately, we are drying out nicely now as it is about time for one of my favorite garden endeavors, bulb planting.

By David Streit  |  12:15 PM ET, 09/16/2011 |  Permalink  |  Comments ( 0)
Categories:  Environment, Local Climate, Latest, Gardening

Posted at 10:54 AM ET, 09/16/2011

Stunning September sunset in Washington, D.C.

Following the passage of Thursday evening’s cold front, the setting sun intercepted streams of wavy stratocumulus clouds. The fiery oranges and smoky reds that glowed in the dusk sky fittingly forshadow those same shades to soon emerge in the foliage. These stellar photos submitted by Capital Weather Gang readers across the region have beautifully documented one of the finest Washington, D.C. sunsets in recent memory....

By Jason Samenow  |  10:54 AM ET, 09/16/2011 |  Permalink  |  Comments ( 0)
Categories:  Photography, Latest

Posted at 05:00 AM ET, 09/16/2011

Forecast: Brisk with sun and clouds. Hello autumn?

Shock and awe! Cool temperatures may shock our summer-complacent bodies but we see the awe-some yellow orb in the sky once again. We have a colder airmass at the surface and aloft, which means that any sunshine we see over the next few days could itself cover up the sky with midday and afternoon clouds unfortunately. 60s and 70s for temperatures aren’t too bad, right? Just keep that jacket handy, and check back with us this weekend to make sure a spotty (very isolated) shower isn’t headed your way. Welcome to a full-fledged fall preview!

By A. Camden Walker  |  05:00 AM ET, 09/16/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/16/2011

NatCast: Chilliest since early season

It’s been a while since we have needed to dress in layers – but now is the time! Our bodies won’t be used to the cool breeze and temperatures by game’s end perhaps as cool as upper 50s! With the sun setting earlier, it won’t help keep you warm either!

By A. Camden Walker  |  04:55 AM ET, 09/16/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 05:51 PM ET, 09/15/2011

Tornado or waterspout spotted in Ocean City, Maryland

A waterspout, or possibly a tornado, was spotted by numerous people in Ocean City, Maryland around 4 p.m. this afternoon. Photographs posted to Twitter are inconclusive as to whether the funnel touched down on land, which would classify as it as tornado, or remained over water. The National Weather Service in Wakefield, Va. would only confirm that there were waterspout sightings.

By Jason Samenow  |  05:51 PM ET, 09/15/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Thunderstorms

Posted at 04:27 PM ET, 09/15/2011

PM Update: Here comes fall weather

After midday highs in the mid-70s, temperatures declined this afternoon in the wake of a strong early season cold front. The accompanying showers will gradually subside this evening and temperatures will plunge to their lowest levels since early May. Fall weather is firmly entrenched over the region Friday.

By Jason Samenow  |  04:27 PM ET, 09/15/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:30 PM ET, 09/15/2011

NSIDC: Arctic sea ice extent second lowest; NOAA: 8th warmest August globally

NOAA announced today that August was globally the eighth warmest on record, about one degree above the 20th century average. It also reported the June through August period was 7th warmest on record. June through August temperatures have been warmer than average across the globe for 35 straight years (since 1976). Meanwhile, the National Snow and Ice Data Center (NSIDC) made the preliminary announcement that Arctic ice “appears to have reached its lowest extent for the year.” On September 9, Arctic sea ice extent fell to 4.33 million square kilometers, about 2 million square kilometers below average, second only in minimum extent to 2007 in the satellite record (1979 to present).

By Jason Samenow  |  03:30 PM ET, 09/15/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Climate Change

Posted at 01:00 PM ET, 09/15/2011

Cold front sweeps across country; new record lows set in Minnesota

A powerful early fall (or late summer) cold front has plowed across the U.S., resulting in widespread frost and freezes in the Upper Midwest and northern Great Lakes while bringing welcome relief from record heat in the south central U.S.

By Jason Samenow  |  01:00 PM ET, 09/15/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, U.S. Weather

Posted at 12:00 PM ET, 09/15/2011

Getting to the bottom of Reston’s sinkhole

If you travel east on Sunrise Valley Drive between the Fairfax County Parkway and the Reston Parkway you will notice the lanes are closed near Glade Drive. The closure is caused by a sinkhole in the eastbound lanes that was created by the flooding rains of Tropical Storm Lee. Capital Weather Gang decided to do some investigative reporting, to get to the bottom of Reston’s sinkhole.

By Kevin Ambrose  |  12:00 PM ET, 09/15/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Floods, Photography

Posted at 10:10 AM ET, 09/15/2011

What is Washington, D.C.’s weather like in September? Breaking down norms and extremes

September may often be cited as the beginning of the “nice weather season” in Washington, D.C. Summertime heat and humidity are on the wane, and glorious sunny days are only sometimes stopped in their tracks by (often tropical and sometimes significant) rain events. As the month progresses, those overnight lows start getting back into the light jacket type of territory. Can talk of snow be far off?

By Ian Livingston  |  10:10 AM ET, 09/15/2011 |  Permalink  |  Comments ( 0)
Categories:  Local Climate, Latest, History

Posted at 05:00 AM ET, 09/15/2011

Forecast: Strong cold front brings showers; crisp weekend ahead

After last week, the showers today shouldn’t raise an eyebrow. However, they are just the opening act as strong winds and much cooler conditions surge into the area. Lows should reach levels that haven’t been seen in these parts since early May. Starting searching for that jacket now because you will need it Friday morning.

By David Streit  |  05:00 AM ET, 09/15/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 08:25 PM ET, 09/14/2011

PM Update: Saying goodbye to summer? Some showers and storms help usher in cooldown

It’s probably at least slightly premature to say we’re done with heat, but we very well may be after today. One thing for sure: there is no real warmth on the immediate horizon and we’re running out of time for such. A series of cold fronts pass through late tonight and then tomorrow, and behind the second our first real taste of fall appears. But first, we may see some drops of rain into Thursday.

By Ian Livingston  |  08:25 PM ET, 09/14/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:07 PM ET, 09/14/2011

Arctic sea ice volume reaches record low for second straight year

Arctic sea ice continues a long-term melting trend, setting new record lows for both volume and extent.

By Jason Samenow  |  02:07 PM ET, 09/14/2011 |  Permalink  |  Comments ( 0)
Categories:  Climate Change, Latest

Posted at 11:46 AM ET, 09/14/2011

Is the Atlantic hurricane season winding down?

The Atlantic hurricane season is not over by a long shot. In fact, we’re in the middle of the most active few weeks of the season historically. However, the tropics seem poised to enter a temporary quiet period once tropical storm Maria becomes part of an extratropical rainstorm over the North Atlantic in a couple days. A spell of inhospitable conditions that will shut down storm development is beginning to temporarily settle over Africa and the Atlantic Basin.

By Greg Postel  |  11:46 AM ET, 09/14/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather

Posted at 10:30 AM ET, 09/14/2011

Hurricane Irene and tropical storm Lee bruise the Chesapeake Bay

Thanks to the onslaught of tropical downpours from hurricane Irene and the remnants of tropical storm Lee, portions of the Chesapeake Bay watershed have received in excess of 32” of rain over the last two weeks according to NOAA. This rain and associated runoff have all made its way into the Bay.

By Jason Samenow  |  10:30 AM ET, 09/14/2011 |  Permalink  |  Comments ( 0)
Categories:  Environment, Floods, Latest

Posted at 05:00 AM ET, 09/14/2011

Forecast: Summer’s here today, gone by Friday

As meteorologists, we tend to use the term cold front liberally, like earlier this summer when a “cold” front dropped highs from the 100s one day to the still excessively hot upper 90s the next. Our next cold front, however, is the real deal - on track to knock highs down to the 60s by Friday after approaching 90 today.

By Dan Stillman  |  05:00 AM ET, 09/14/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 06:00 PM ET, 09/13/2011

Play UK Met Office weather game and contribute to science of communicating uncertainty in forecasting

The United Kingdom (UK) Met Office has launched an online weather game to assess the most effective and useful presentations to communicate information to the public on the inevitable uncertainties in weather predictions. Players of the game will help a fictitious ice cream man, Brad, run his business – and maximize his profit - by deciding where and when to sell his ice cream treats. These decisions will depend on players’ interpretation of weather forecasts with varying levels of uncertainty (confidence) expressed in differing frameworks using probabilities.

By Steve Tracton  |  06:00 PM ET, 09/13/2011 |  Permalink  |  Comments ( 0)
Categories:  Education, Tracton, Latest

Posted at 03:50 PM ET, 09/13/2011

PM Update: One more summery evening and day ahead

Even if slightly humid, today was rather pleasant, with highs managing only the low-to-mid 80s - a bit cooler than the upper 80s forecast. A nice evening awaits to be followed by our last day with highs in the 80s of the week. More fall-like weather arrives during the day on Thursday.

By Jason Samenow  |  03:50 PM ET, 09/13/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:00 PM ET, 09/13/2011

Second hottest summer on record in U.S.; Texas continues sizzling

As much of the country awaits its first real taste of autumn air, the news from NOAA is that the summer was the second hottest on record in the U.S. The average summertime temperature was 74.5 degrees F, 2.4 degrees above average.

By Jason Samenow  |  02:00 PM ET, 09/13/2011 |  Permalink  |  Comments ( 0)
Categories:  U.S. Weather, Latest

Posted at 11:45 AM ET, 09/13/2011

Join the Capital Weather Watchers program; free Skywarn Spotter training

Do you love weather? Now you can learn more about weather and share what’s happening in your neighborhood by joining Capital Weather Gang’s new Capital Weather Watchers program. We’re signing up people in every corner of every neighborhood in the D.C. region to help us tell our readers about weather events. And we’re offering a chance to get some facts and training from National Weather Service (Sterling, Va.) warning coordination meteorologist Chris Strong at a special two-hour class on Tuesday, October 11 at the Washington Post.

By Capital Weather Gang  |  11:45 AM ET, 09/13/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Capital Weather Gang

Posted at 10:20 AM ET, 09/13/2011

Dissecting the daily digit: Forecaster averages, nice days, and best commentary (Part II)

The torrential rains that flooded many parts of the D.C. area last week are a good reminder that our daily weather can range anywhere from pleasant to uncomfortable, calm to disruptive, and benevolent to life-threatening. Moreover, weather evokes different responses from different people: some like the heat; others prefer it cold (or somewhere in between). And in the precipitation department, rain and snow both have their enthusiasts and detractors. In my last post I analyzed the history of CWG’s daily digit: the subjective rating of Washington’s day-to-day weather on a 0-10 scale. Today we’ll take a look at forecaster averages, our awarding of ‘Nice Day’ badges, and our forecasters’ most memorable daily digit comments.

By Justin Grieser  |  10:20 AM ET, 09/13/2011 |  Permalink  |  Comments ( 0)
Categories:  Capital Weather Gang, Latest

Posted at 05:00 AM ET, 09/13/2011

Forecast: Warm today and tomorrow; “jacket” weather by late week

Dominant sunshine rules the day as temperatures inch up a bit warmer than yesterday. Combined with a slight humidity increase, the afternoon temperatures could feel a bit closer to 90 degrees even. More 80s along with more clouds tomorrow before a massive early-season cold front delivers the coolest weather to our area since May for late this week.

By Matt Rogers  |  05:00 AM ET, 09/13/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:15 PM ET, 09/12/2011

PM Update: Mild temperatures continue and any rain risk disappears for Tuesday

We’ve eked out another pretty decent day around here, though there’s still a slight chance of a shower heading into evening. After that, we’ve got a delightful overnight with temperatures dipping as far as the upper 50s in spots. Tuesday may end up fairly warm for September, but at least it’s looking totally dry before another cold front brings more rain risks and, ultimately, significantly cooler air later in the week.

By Ian Livingston  |  04:15 PM ET, 09/12/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:15 PM ET, 09/12/2011

National Weather Service: Ft. Belvoir rain was more than 1 in 1,000 year event, “off the charts”

On Thursday, September 8, Ft. Belvoir received an astounding 7.03” of rain in three hours. According to the National Weather Service (NWS), that amount of rain in that amount of time was an “off the charts above a 1000-year rainfall (based on precip frequency from Quantico).”

By Jason Samenow  |  03:15 PM ET, 09/12/2011 |  Permalink  |  Comments ( 0)
Categories:  Floods, Local Climate, Latest, Climate Change

Posted at 02:15 PM ET, 09/12/2011

Historic flooding recedes in Pennsylvania, New York; at least 15 dead

Residents of hard-hit communities in northeastern Pennsylvania and areas of neighboring New York State began the long recovery process following devastating flooding from the remnants of Tropical Storm Lee. The Susquehanna River continued receding after setting new all-time records in Binghamton, New York and Wilkes-Barre, Pennsylvania. The storm is being blamed for seven deaths in Pennsylvania, where rainfall amounts reached more than 15 inches in Lancaster County.

By Andrew Freedman  |  02:15 PM ET, 09/12/2011 |  Permalink  |  Comments ( 0)
Categories:  Climate Change, Floods, Freedman, U.S. Weather, Latest

Posted at 12:20 PM ET, 09/12/2011

The flood of the Reston North Park and Ride

A man with an umbrella is chest-deep in water searching for his car at the Reston North Park & Ride lot last Thursday. The commuter lot was submerged in water from the heavy rain related to the remnants of Tropical Storm Lee.

By Kevin Ambrose  |  12:20 PM ET, 09/12/2011 |  Permalink  |  Comments ( 0)
Categories:  Floods, Photography, Latest

Posted at 11:00 AM ET, 09/12/2011

Atlantic storm, once hurricane Katia, slams Scotland, northern Ireland

Late last week, hurricane Katia split the gap between the U.S. East Coast and Bermuda, sparing them high winds and rain, merely pushing ashore high surf. But over the weekend, Katia transitioned from a hurricane into a large, mid-latitude cyclone as it charged across the northern Atlantic. Yesterday and today, it is battering the northern portion of the United Kingdom with damaging winds and flooding rain.

By Jason Samenow  |  11:00 AM ET, 09/12/2011 |  Permalink  |  Comments ( 0)
Categories:  Tropical Weather, International Weather, Latest

Posted at 05:00 AM ET, 09/12/2011

Forecast: Warm through Wednesday, then big blast of autumn air

The week begins with a trio of summery days but then we abruptly shift to an entirely different weather regime. Fall takes hold as highs drop from the 80s to mostly the 60s Thursday through the weekend. Unlike last week, we won’t have historic rains, but showers are a possibility today, Wednesday and cannot be ruled out late in the week into the weekend either.

By Jason Samenow  |  05:00 AM ET, 09/12/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 05:00 AM ET, 09/11/2011

Forecast: Showers threaten, but shouldn’t wash out a busy Sunday

It’s a super-busy day around town including Sept. 11 remembrance activities, the Redskins regular season home opener, and a game at Nats Park. But will the weather cooperate? For much of the day it should, though scattered showers and storms may develop later in the day into the evening. A Flash Flood Watch is in effect noon through this evening, since with all the rain we’ve had, we can’t rule out some more flooding if any downpours occur.

By Brian Jackson  |  05:00 AM ET, 09/11/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/11/2011

SkinsCast: Kicking off with a shower/storm chance

A new season of fall football kicks off with a lingering summery feel, including the potential for a couple showers or a t’storm - likely not enough to dampen the spirit of the Burgundy and Gold faithful.

By Brian Jackson  |  04:55 AM ET, 09/11/2011 |  Permalink  |  Comments ( 0)
Categories:  SkinsCast, Latest

Posted at 04:55 AM ET, 09/11/2011

NatCast: Shower chance, but game should go on

A pretty decent day for a ballgame. A few light showers are possible. Shouldn’t be enough to halt play, though maybe pack an umbrella with your mitt.

By Brian Jackson  |  04:55 AM ET, 09/11/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 05:00 AM ET, 09/10/2011

Forecast: More sun and less drippy, but maybe not rain free until Tuesday

The flood risk is waning as we begin the drying out process across the area. Unfortunately it’s hard to fully dry out when rain continues to threaten, though it should not be nearly as heavy or widespread as earlier in the week. In fact, if you work it right, you may end up with a pretty decent weekend to get some things done in that soggy world out there. Highs near or top 80 pretty much everywhere through Sunday.

By Ian Livingston  |  05:00 AM ET, 09/10/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/10/2011

NatCast: Shower chances low but not zero

Any showers around should not be too widespread. Humidity is down a bit compared to recently, but still noticeable. Hard to argue with this as a viable Saturday night outing!

By Ian Livingston  |  04:55 AM ET, 09/10/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 04:15 PM ET, 09/09/2011

PM Update: Sun glorious sun; shower chances this weekend small

Dry air wrapped into the region this afternoon, cutting off the rain train and delivering some of the most welcome sunshine in recent memory. The swirling remnants of tropical storm Lee, however, still linger to our west and could spin up showers over the weekend, mainly in the afternoon. Temperatures will be seasonably warm each day.

By Jason Samenow  |  04:15 PM ET, 09/09/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 01:30 PM ET, 09/09/2011

Flood photos from Northern Virginia

Rainfall rates Thursday were incredible at times, as high as 2-4” per hour, leading to widespread flooding in northern Virginia, particularly Fairfax county. This post contains a sampling of photos from throughout the region, submitted by Capital Weather Gang blog readers, Facebook fans, and Twitter followers.

By Jason Samenow  |  01:30 PM ET, 09/09/2011 |  Permalink  |  Comments ( 0)
Categories:  Photography, Floods, Latest

Posted at 10:15 AM ET, 09/09/2011

How does the early September 2011 East Coast flood event rank in the Washington D.C. area?

There are certain weather events that get etched into our memories because of their impact. This week’s flooding rains are sure to end up in that category for many in the Washington region. While the rain event is not completely over, some early comparisons can be made by taking a look at the historical record in the area.

By Ian Livingston  |  10:15 AM ET, 09/09/2011 |  Permalink  |  Comments ( 0)
Categories:  Floods, Local Climate, Latest

Posted at 05:00 AM ET, 09/09/2011

Forecast: Wickedly wet conditions slowly wane through the weekend

Slowly, ever so gradually, these tropical rains are going to end. After another showery day today, we have a less-wet weekend ahead. We can look toward next week when, by Monday or Tuesday, we actually may have a sunny precipitation-free day. For the time-being, please stay on-guard for flash flooding and river flooding in our area. Our last commutes of the workweek could be challenging, but at least next week’s commuting looks to be much less so!

By A. Camden Walker  |  05:00 AM ET, 09/09/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/09/2011

NatCast: Damp seats, but rain chances down

Assuming you make the still-soggy trek out, be wary of rain issues. We’re hoping that rain odds are finally on the way down but you never know around here these days.

By A. Camden Walker  |  04:55 AM ET, 09/09/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 12:00 AM ET, 09/09/2011

Dangerous flooding continues to plague portions of metro region

Steadily today, the axis of heavy rain shifted from D.C.’s eastern suburbs to the western suburbs. A difficult evening commute is likely throughout the region as heavy rain redevelops over the District and eastern suburbs. Flash flooding has already closed many roads. Heavy showers capable of flash flooding continue overnight with more rain Friday, but less widespread than today.

By Jason Samenow  |  12:00 AM ET, 09/09/2011 |  Permalink  |  Comments ( 0)

Posted at 02:30 PM ET, 09/08/2011

The latest on Hurricane Katia and tropical storms Maria and Nate

While the remnants of tropical storm Lee have been flooding the mid-Atlantic and northeast, the tropical Atlantic and Gulf of Mexico remain very active with three named storms, tropical storm Maria, hurricane Katia, and tropical storm Nate swirling about.

By Jason Samenow  |  02:30 PM ET, 09/08/2011 |  Permalink  |  Comments ( 0)
Categories:  Tropical Weather, Latest

Posted at 01:10 PM ET, 09/08/2011

Flood videos and photos: ignore “turn around, don’t drown” at your own peril

Driving through flood water is a bad idea. In fact, it’s downright dangerous. That didn’t stop many from trying to do exactly that yesterday as these photos and videos clearly demonstrate.

By Jason Samenow  |  01:10 PM ET, 09/08/2011 |  Permalink  |  Comments ( 0)
Categories:  Floods, Latest

Posted at 10:40 AM ET, 09/08/2011

Washington, D.C. flooding: What’s behind the rain train?

Relentless and punishing: words used to describe the heat in June and July can now describe the onslaught of torrential showers and thunderstorms since late Sunday. East of D.C., 6-10 inches of rain over the last four days has been common and widespread flooding has occurred. An uncommon combination of moisture streams has converged to make this prolific rain-producer possible.

By Jason Samenow  |  10:40 AM ET, 09/08/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Floods, Local Climate

Posted at 05:00 AM ET, 09/08/2011

Forecast: Flood risk to slowly wane but umbrella weather continues; weekend improvement

In the first week of September, we have already received more than our month’s worth of rain. More showers are likely today. At least today’s rain should not be as heavy and persistent as yesterday’s. But with saturated soils, just a little rain may cause additional flooding in some areas. Rain chances linger into the weekend but decrease.

By David Streit  |  05:00 AM ET, 09/08/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/08/2011

NatCast: Showers possible for doubleheader, but should get games in

The chance of a shower delay is a decent bet but a rain-out is low for either game.

By David Streit  |  04:55 AM ET, 09/08/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 11:15 PM ET, 09/07/2011

PM Update: More heavy rain, flooding possible overnight

Flash Flood Warnings continue this evening for large portions of the area as more heavy rain moves through. Meanwhile, Tornado Warnings have been issued in parts of Southern Maryland.

By Ian Livingston and Dan Stillman  |  11:15 PM ET, 09/07/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 10:58 AM ET, 09/07/2011

Dangerous flooding in parts of region; flash flood warnings end this afternoon/evening

A flash flood warning has been issued until 1:45 p.m. for the District, eastern Fairfax county, Arlington, Alexandria, east Falls Church city, western Prince George’s county, and central Charles county as a long, narrow slug of torrential rain moves over the region. Rainfall of 2” in just an hour or two is possible. Remember never try to drive through flooded roadways, turn around, don’t drown.

By Jason Samenow  |  10:58 AM ET, 09/07/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Floods

Posted at 05:00 AM ET, 09/07/2011

Forecast: More rain, some storms, high flood risk

For summer lovers, yesterday was a tough back-to-reality kind of day. Dramatically cooler temperatures prompted some to wear a jacket for the first time in a long time. While warmer air returns today, rain chances remain on the high side into tomorrow and linger into the weekend. Flash flooding remains a significant risk as well, especially today when torrential rain is likely.

By Dan Stillman  |  05:00 AM ET, 09/07/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/07/2011

NatCast: Shower threat looms again

It’s just really hard to predict the timing and location of rain in this pattern. Showers are likely at some point. Might they be few enough or timed such that they get this game in or at least a good chunk of it? Maybe yes, maybe no.

By Dan Stillman  |  04:55 AM ET, 09/07/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 04:15 PM ET, 09/06/2011

PM Update: Periods of rain continue, sometimes heavy; warmer Wednesday

For the first time since mid-May, the high temperature in D.C. failed to reach 70 degrees. While a northerly wind made it feel like fall, rain remains the big story. Moderate to heavy rain showers are likely overnight and continue into tomorrow. The steadiest rain and greatest risk of flooding will generally be west of I-95.

By Jason Samenow  |  04:15 PM ET, 09/06/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 02:33 PM ET, 09/06/2011

Hurricane Katia to pass between East Coast and Bermuda; new areas of tropical concern brewing

Category 1 Hurricane Katia has begun the long road to recurvature out to sea. Currently moving northwest at 9 mph roughly 900 miles off of Florida’s east coast, this 115 mph storm should cut between Bermuda and the United States with relatively modest impacts.

By Greg Postel  |  02:33 PM ET, 09/06/2011 |  Permalink  |  Comments ( 0)
Categories:  Tropical Weather, Latest

Posted at 12:30 PM ET, 09/06/2011

Drought-fueled wildfires burn out of control in Texas

Swift-moving wildfires killed two in Texas this weekend and burned thousands of acres, as the impacts of the worst one-year drought in state history continue to escalate. The drought is expected to cost several billion dollars, mainly from agricultural impacts. Texas Governor Rick Perry, a leading contendor for the Republican presidential nomination, left the campaign trail this weekend to help coordinate response efforts in his home state.

By Andrew Freedman  |  12:30 PM ET, 09/06/2011 |  Permalink  |  Comments ( 0)
Categories:  U.S. Weather, Freedman, Climate Change, Latest

Posted at 11:00 AM ET, 09/06/2011

Rainy week: what’s the cause and how much?

The rain poured down fast and furiously last night producing 1-2” of rain across the immediate metro region, and up to 2-4” to the west and southwest. The rain, which prompted several flash flood warnings, was just the first of several waves of rainfall likely over the next few days. By the end of the work week, cumulative rainfall totals may reach 3-6” in the immediate metro region, with 4-8” towards the mountains. With in both of these areas, locally higher amounts cannot be ruled out.

By Jason Samenow  |  11:00 AM ET, 09/06/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Floods, Local Climate, Tropical Weather

Posted at 05:00 AM ET, 09/06/2011

Forecast: Frequent rain chances, sometimes heavy; flood risk persists

Remnants of former Tropical Storm Lee get caught up over our area for the balance of this short work week. Rains could be heaviest in the mountains, but the entire area runs the risk of flash flooding, especially today into this evening. The situation should wind down a bit by this weekend to allow for some improved conditions, but showers/storms could still linger a bit.

By Matt Rogers  |  05:00 AM ET, 09/06/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/06/2011

NatCast: Dodging frequent showers and storms for Strasburg’s big return

Frequent showers and storms around the metro area make a challenging effort for the game tonight. The game might get in with the heaviest precipitation west of the city, but it is more likely to see some rain delays or even postponement.

By Matt Rogers  |  04:55 AM ET, 09/06/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 05:00 AM ET, 09/05/2011

Forecast: Frequent rains for September’s first full week; risk of flooding

A stalled front draped over the area captures a stream of rich moisture surging northward, including the remnants of tropical storm Lee. Several inches of rain may drench the region and a flash flood watch is in effect tonight through Tuesday night. With persistent cloud cover, temperatures run cooler than average - generally in the 70s.

By Jason Samenow  |  05:00 AM ET, 09/05/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/05/2011

NatCast: A chance to dodge the rain

The best chance of showers and storms arrives after the game, but cannot rule out a rain delay or even postponement.

By Jason Samenow  |  04:55 AM ET, 09/05/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 05:00 AM ET, 09/04/2011

Forecast: Salvageable Sunday, less-than-perfect Labor Day

While today should be mostly pleasant, the threat of showers and storms increases tonight and tomorrow as a cold front gets closer. Rain isn’t a sure bet tomorrow, but I’d advise at least having a sheltered backup plan for any Labor Day outdoor activities. More significant periods of rain may develop Monday night into Wednesday as the tropical remnants of Tropical Storm Lee head toward our area.

By Brian Jackson  |  05:00 AM ET, 09/04/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/04/2011

NatCast: Warm and humid; shower late?

A summery day at the park with warm and humid conditions. Rain chance should hold off until later in game, and even then it’s not terribly high.

By Brian Jackson  |  04:55 AM ET, 09/04/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 05:00 AM ET, 09/03/2011

Forecast: A few storms, but overall decent start to holiday weekend

We start off Labor Day weekend with a few Saturday morning storms, mainly in the north and west suburbs, but after that it’s a mainly dry but increasingly muggy day with highs in the 80s, before potentially striking 90 -- or even a hair above -- on Sunday. Rain risks increase Sunday, and by Monday we could be into the start of a multi-day rainy period. Still lots to be answered on that front though.

By Ian Livingston  |  05:00 AM ET, 09/03/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/03/2011

NatCast: Still feelin’ summertime humidity

This should be a pretty nice night for a game. Humidity is up though, so prepare for that. It hopefully stays dry but we can’t totally rule out a shower encroaching from the west during the game.

By Ian Livingston  |  04:55 AM ET, 09/03/2011 |  Permalink  |  Comments ( 0)
Categories:  NatCast, Latest

Posted at 04:40 PM ET, 09/02/2011

PM Update: Humid weekend, storm chances grow by Labor Day

Considerable cloud cover today held temperatures in check, mostly below 80 degrees. But a warm, humid airmass is in place so more sunshine this weekend should give temps a boost, pushing us well into the 80s to even near 90 by Sunday. A front very slowly edges into the region, offering a chance of storms Sunday and especially as Labor Day progresses.

By Jason Samenow  |  04:40 PM ET, 09/02/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:30 PM ET, 09/02/2011

The Southern Plain’s stunning summer heat

September cannot progress quickly enough in the Southern Plains after a summer of unprecendented and punishing heat.

By Jason Samenow  |  03:30 PM ET, 09/02/2011 |  Permalink  |  Comments ( 0)
Categories:  U.S. Weather, Latest

Posted at 12:45 PM ET, 09/02/2011

Hurricane Katia: East Coast not out of the woods

After weakening last night to a 70 mph tropical storm, Katia has regained hurricane intensity today with maximum winds of 75 mph. It is moving west-northwest at about 14 mph, and is still roughly 2000 miles from North America. Although it remains likely to turn out to sea late next week, some models are starting to bring Katia a little close to the East Coast for comfort.

By Greg Postel  |  12:45 PM ET, 09/02/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather

Posted at 11:15 AM ET, 09/02/2011

Tropical storm Lee poses significant flooding risk for New Orleans, central Gulf Coast

Tropical depression 13 has strengthened and been given the name tropical storm Lee. Positioned 200 miles southwest of Cameron, La., it has maximum sustained winds of 40 mph. Tropical storm warnings stretch from Pascaguola, Ms. to Sabine Tx, including New Orleans. The National Hurricane Center warns of “extensive flooding, especially in urban areas.”

By Jason Samenow and Greg Postel  |  11:15 AM ET, 09/02/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, Tropical Weather

Posted at 05:00 AM ET, 09/02/2011

Forecast: Summer makes somewhat of a comeback

We crescendo from highs in the 80s today toward or into the 90s on Saturday and Sunday. Shower and storm chances see a general increase heading through the holiday weekend, but we can still fit in some time at the pool and a bbq or two. We do look set for a string of nice days after the holiday, though that depends on the eventual fate of the tropical system currently in the Gulf of Mexico.

By Camden Walker  |  05:00 AM ET, 09/02/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 04:55 AM ET, 09/02/2011

NatCast: Nice night for new homestand

Even if it’s a tad humid, you’ll have a slight breeze mitigating it. A few clouds and essentially no chance of rain means not much to worry about in the weather department.

By Camden Walker  |  04:55 AM ET, 09/02/2011 |  Permalink  |  Comments ( 0)
Categories:  Latest, NatCast

Posted at 04:00 PM ET, 09/01/2011

PM Update: Partly cloudy this evening, a fine Friday, somewhat humid

The surprise showers in a few spots this afternoon arose from a weak warm front passing through the region. Said front has turned our winds out of a southerly direction which means increasing humidity from now into the holiday weekend. While moderately humid Friday, it should be mainly dry.

By Jason Samenow  |  04:00 PM ET, 09/01/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

Posted at 03:00 PM ET, 09/01/2011

Cleaning up the garden after sloppy hurricane Irene!

I hope everyone is recovering from the wrath of Irene. Looking at some of those pictures of flooding in wetter areas up north, I would say our drought was our salvation. Having dry soils helped to keep most trees well rooted and safe from toppling, which would not have been the case if the ground had already been soaked. So I guess we can count our blessings in many ways.

By David Streit  |  03:00 PM ET, 09/01/2011 |  Permalink  |  Comments ( 0)
Categories:  Environment, Local Climate, Latest, Gardening

Posted at 12:15 PM ET, 09/01/2011

Hurricane Katia continues westbound; Gulf system poses major flooding risk

Still more than a thousand miles east of the Leeward islands, Hurricane Katia continues a steady march towards the western Atlantic. Of more immediate concern, perhaps, is an area of disturbed weather in the east central Gulf of Mexico which could be a massive rainmaker for portions of the U.S. Gulf coast.

By Jason Samenow  |  12:15 PM ET, 09/01/2011 |  Permalink  |  Comments ( 0)
Categories:  Tropical Weather, Latest

Posted at 10:15 AM ET, 09/01/2011

After manageably warm August, second hottest summer on record in Washington, D.C.

After our all-time hottest month on record in July, it was certainly a relief to see a change in the jet stream pattern over the mid-Atlantic by mid-to-late August. The big hot heat dome that dominated June and July resided primarily over the South Central U.S. in August (consider Houston’s pain- only one day of the entire month saw a high temperature below 100 degrees!). However, a cooler August did not allow us to escape the status as the second hottest summer on record- behind only last year (2010).

By Matt Rogers  |  10:15 AM ET, 09/01/2011 |  Permalink  |  Comments ( 0)
Categories:  Local Climate, Latest

Posted at 05:00 AM ET, 09/01/2011

Forecast: A lone shower today, more raindrops possible for the holiday weekend

Ah, the last hurrah of summer. This weekend should be a piece of cake compared to last week’s tropical deluge. Unfortunately, there will be a few showers to deal with today and Saturday, but the main interruption should be reserved for Sunday afternon/evening in an otherwise lovely long weekend.

By David Streit  |  05:00 AM ET, 09/01/2011 |  Permalink  |  Comments ( 0)
Categories:  Forecasts

 

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