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Posted at 05:00 AM ET, 09/01/2012

D.C. area forecast: Meteorological fall starts toasty and humid, and an increasing rain risk lurks

11:30 a.m. update: A few light showers rolled by this morning, though they are generally falling apart heading toward afternoon. Clouds have also been slightly more numerous than planned thus far. We should still see breaks this afternoon though. Additional isolated showers or t’showers are possible this afternoon as noted below. Highs could end up on the low side of the range for today given the extra clouds.

EXPRESS FORECAST

Today: Partly sunny. Shower or t’shower? Near 90 to Mid-90s. | Tonight: Partly to mostly cloudy, muggy. Showers possible. Near 70 to mid-70s. | Sunday: Mostly cloudy. Showers and t’showers likely. 80s. | A Look Ahead | Get Express Forecast by E-mail

TODAY'S DAILY DIGIT

A somewhat subjective rating of the day’s weather, on a scale of 0 to 10


September feelin’ more like July. But, this might be the sunniest and driest day of the holiday weekend... Get the Digit on Twitter| Discuss on Facebook

FORECAST IN DETAIL


50 days of 90 degrees or higher, 28 of which were 95 or higher... it’s nice to finally put meteorological summer (Jun-Aug) behind us! Now we say another unofficial good-bye to summer this weekend, and while temperatures will “cool” thanks to more clouds and rain chances, there’s no major hint of fall in the forecast just yet. Today is maybe the pick of the next three for doing things outdoors, simply because rain chances are relatively low. It’s not going to be the most pleasant time during the day though.

Today (Saturday): It feels a bit more like July than September when taking high humidity and mixing it with above average temperatures. On the plus side for those taking in the unofficial end of summer, skies are partly sunny, with perhaps periods of clouds more dominant. There’s a 20% chance of a passing shower early as a warm front meanders through, and clouds may bubble a bit more late, resulting in a 30% chance of a shower or t’shower during the afternoon. Highs make it to near 90 or into the mid-90s. Confidence: Medium-High

Tonight: High humidity makes itself at home, and clouds tend to thicken as well. That means we’re looking at a muggy night with lows near 70 in the suburbs to the low-or-mid 70s downtown. Any showers should be isolated to scattered, so a general 30% chance should suffice. Confidence: Medium-High

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast into next week...

Tomorrow (Sunday): Let’s start with the good news: temperatures are down, with highs mainly in the mid-80s. Of course, that also means clouds are plentiful, thanks to a front in the area plus moisture spilling from Isaac’s remnant circulation. Showers and t’showers become more likely as the day goes (60% chance by afternoon), with some batches of heavy rainfall activity possible, and perhaps eventually some flash flooding as well. Confidence: Medium

Tomorrow night: Shower and t’shower activity may tend to wane after dark, but there’s still a 50% chance through the night of a few, possibly still heavy, here and there. Otherwise, plan on mostly cloudy skies and continued muggy temperatures reaching lows near 70 to the low 70s. Confidence: Medium

A LOOK AHEAD

Labor Day (Monday) brings more rain risks to the area, with showers and t’showers becoming a good bet (60% chance) by afternoon yet again. Exact timing and location will be difficult to pinpoint ahead of time as throughout this unsettled period, but any rainfall could be heavy with possible flash flood threats. Highs should make the low-to-mid 80s again. Confidence: Medium

After scattered showers and t’showers dwindle Monday night, Tuesday may catch us a quick break. However, another front approaching from the west could serve as a focus late, and there’s a risk of general scattered pop-ups during much of the day in this soupy air mass. Since it’s pretty far off, I’ll go with a 50% chance of rain for now. Highs reach the low-to-mid 80s. Confidence: Low-Medium

By  |  05:00 AM ET, 09/01/2012

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