* Washington region hammered by heavy rain, flash floods | Flood warning until 6 p.m. *

11:25 a.m. - Heavy rain exiting region in Southern Maryland, but a mess left behind

Rain has eased in much of the immediate area, but dozens of roads remain closed after a historic rush hour deluge that unloaded up to 4 inches of rain in an hour. Waters should slowly recede over the next several hours (a flood warning remains in effect until 6 p.m.) but expect delays and avoid traveling near creeks and streams where water levels are still high.

We’ll still have some showery conditions into the mid-afternoon before we should begin to gradually dry out. Scroll down for the detailed forecast through the week. This is the last update in this post. We’ll post a recap and explainer of what happened this afternoon.

Here are a few more photos of the flood aftermath and earlier flooding...

10:30 a.m. - Torrential rain moves south of Beltway, but many closed roads, residual impacts. Flash flood warnings continue and have been extended south.

The torrents continue sliding southeast, spanning from near Clinton in Prince George’s County to St. Charles in Charles County. Flash flood warnings have been expanded south into northern St. Mary’s County through noon.

But even as the worst of the rain pushes south of the Beltway, residual flooding continues a flash flood warning for the immediate area has been extended until until 1:45 p.m. Today is a good day to work from home as many roads remain closed due to flooding and it will take until early afternoon for some waters to recede.

The intensity of this morning’s rain event ranks among the more extreme summer rain events on record. The 3.53 inches at Reagan National, most of which fell in an hour (between 9 and 10 a.m.), ranks among the top 25 heaviest single day rainfall events on record (since 1871) between June and August and in the top 0.15 percent of summer days, according to Capital Weather Gang’s Ian Livingston.

Here are some more photos of the flooding and residual impacts:

9:55 a.m. - Worst of rain hitting areas south of Interstate 66 and Rt. 50 but dangerous flooding continues throughout region.

As the heaviest rain pushes into Washington’s southern suburbs, the damage has been done from downtown Washington to Arlington and north through Montgomery County with multiple swift water rescues still ongoing due to stranded vehicles in flood water.

An unbelievable 2.2 inches of rain fell in 35 minutes at Reagan National Airport and 3.3 inches in an hour. Today’s rainfall is a record for July 8 and among the top 10 biggest July rain events on record.

Fairfax County reports it received 30 calls for swift water rescues and dozens of such incidents have occurred in Arlington and Montgomery counties as well.

Many roads are closed due to high water. Avoid traveling routes near creeks and streams and, where it’s raining heavily, it’s best to avoid traveling altogether until the worst passes.

Here are some more photos:

9:25 a.m. - Flash flood emergency for the District, Arlington and Alexandria

The intensity of this rain is incredible and has triggered the most severe kind of flood alert for the District, Arlington and Alexandria: a flash flood emergency - in effect until 11:15 a.m. The National Weather Service calls this a “life-threatening” and “particularly dangerous situation.” Multiple cars have become stranded in high water requiring rescue. Stay off the roads until the worst of this passes by mid-to-late morning.

Pictures reveal seriousness of this flooding situation.

8:50 a.m. - Widespread flooding across region as torrential rain advances southeast

Torrential rain stretches from Potomac, Md. through the District and is continuing to push southeast. Multiple reports of flooding are coming in from across the region while the worst of the rain has exited locations north and west of Germantown and Gaithersburg.

Some notes:

Here are some pictures of the flooding:

8:20 a.m. - Flash flood warning expanded to much of immediate D.C. region including downtown Washington; high water rescues in Montgomery County

The entire immediate Washington area is now under a flash flood warning due to the torrential rain moving from northwest to southeast across the region. Rainfall rates of an inch in 30 minutes are likely, with storm totals up to two to three inches. The worst of the rain should take about one to two hours to move through any one area.

If possible, delay commuting until the worst of the rain passes in your location.

It is critical to not attempt to cross a flooded road in your vehicle. Turn around, don’t drown. The water depth is difficult to judge and you could be stranded in high water or even swept away, requiring rescue.

The National Weather Service indicates at least five high water rescues have been required in Montgomery County.

7:50 a.m. - Flash flood warning expanded into northwest D.C., Arlington, and northern Fairfax County

The flash flood warning for Montgomery County has been expanded southeast and now covers northeast Loudoun, northern Fairfax County, Arlington, and the northwest part of the District. It is in effect until 10:45 a.m. Extremely heavy downpours are pushing southeast from Montgomery County and up to an inch or rain could fall in 30 minutes and two to three inches in the time it takes the rain to pass - which should be about two hours in most areas.

7:35 a.m. -- Flash flood warning for the Interstate 270 corridor; numerous roads flooded and impassible in Frederick

Extremely heavy rain is moving down the Interstate 270 corridor. Downpours have begun in Germantown and Gaithersburg. The heavy rain will hit Rockville in the next 15 minutes. Up to two inches of rain could fall in a very short amount of time causing flooding. Allow extra time for commuting and never attempt to cross a flooded road.

The heavy rain will last one to two hours in affect areas before pushing to the southeast. It could affect the northern half of the Beltway by around 8:30 a.m.

A flash flood warning is also in effect to the northwest around Frederick until 9:45 a.m., where radar indicates four inches of rain or so have fallen in some areas. The worst of the rain should exit this area over the next hour but numerous roads are reported flooded in the city and impassable according to the National Weather Service.

Original post from 5 a.m.

TODAY’S DAILY DIGIT

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

5/10: A gloomy start but improving conditions in the second part of the day.

EXPRESS FORECAST

Today: Rain, especially in the morning. Highs: 77-81.

Tonight: Clearing skies. Lows: 62-67.

Tomorrow: Mostly sunny, less humid. Highs: 84-88.

View the current weather at The Washington Post headquarters.

FORECAST IN DETAIL

We’ll deal with areas of rain this morning, but then conditions improve rapidly by tonight and tomorrow, when we finally can enjoy some time without rain in the forecast. Wednesday is also dry before a front brings the next chance of showers and storms Thursday. The stretch Friday through Sunday also looks promising, but good weather isn’t yet locked in.

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Today (Monday): Areas of rain are likely early, especially in our northern areas, where some heavy downpours may linger. Rain should become spottier throughout the morning and end in the afternoon. While a bit of sun may emerge in the afternoon, considerable cloud cover holds highs to near 80 degrees. Winds are light and humidity is moderately high (dew points in the upper 60s). Confidence: Medium

Tonight: Skies should gradually clear out, and it turns into a pleasant evening with temperatures in the 70s. By morning, lows fall back into the 60s (low 60s cooler spots, upper 60s downtown) as humidity decreases a bit. Confidence: Medium-High

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Tomorrow (Tuesday): High pressure builds in from the north, and it’s a delightful day with sunshine and moderate humidity (dew points 60 to 65). Highs are mostly in the mid-80s with lights wind from the northeast. Confidence: Medium-High

Tomorrow night: Mostly clear skies and comfortable as lows dip to the upper 60s downtown with low to mid-60s elsewhere. Confidence: Medium-High


A pink sky in the Shenandoah Valley Friday. (DCbmyers via Flickr)

A LOOK AHEAD

Wednesday is a pretty good-looking summer day with sunshine, moderate humidity (dew points in the mid-60s) and highs in the upper 80s. We should be able to keep away storms, although some high clouds increase at night with lows 65 to 70. Confidence: Medium-High

While we expect it to be dry more often than not Thursday, humidity increases slightly (dew points 65 to 70) and some showers and storms pop up, especially in the late afternoon and evening. Highs are near 90. Gradual clearing at night, with lows in the 60s. Confidence: Medium

Right now, we lean toward Friday through Sunday being dry for the most part, although we’ll need to watch what happens with a possible tropical system moving out of the Gulf of Mexico. During this stretch, temperatures gradually trend hotter. Highs are in the mid- to upper 80s Friday, warming to near 90 on Saturday, and perhaps the low 90s on Sunday. Humidity levels sneak up from moderate on Friday to moderately high by Sunday. Lows at night increase from the 60s early Friday to 70 or so by Sunday morning. Confidence: Low-Medium