10:10 p.m. – Lingering showers as heavier rain shifts to southeast and east

Showers will linger across much of the area for a couple more hours, but the heaviest rain is now focused east and southeast of the Beltway and continuing to move off to the east. Several flood warnings remain in effect for the next few hours as pictured in the update below.

8:35 p.m. – Stubborn showers and storms still going in D.C. and to the north and west

Not much has changed other than the redevelopment of storms inside the Beltway and D.C., with storms intensifying across the western suburbs and lingering across the northern suburbs. The latest map of active flood warnings (see below) adds a new one in central Montgomery County, putting a large portion of the DMV at risk for flooding through later this evening. With several reports of road closures and trees down, need to drive with extra care within and near areas under flood warnings.

7:30 p.m. – Rain has let up in the District, but heavy storms lingering across the northern suburbs

Activity has diminished in D.C. and points south, but heavy rain and lightning continues for many of our northern suburbs. Everyone should see things start to calm down after 8:30 or 9. But several areas, including where the rain has already let up, remain under flood warnings until later this evening (see map below).

6:45 p.m. – Numerous storms persisting as flood warnings remain

We’ve got numerous pockets of heavy rain and frequent lightning (although the lightning seems to have lessened a bit) across the D.C.-Baltimore area, except south of the Beltway where things are quiet for now. Flooding remains a serious concern for at least the next hour or two, after which we should see the storms start to wane. A severe thunderstorm warning in Howard County includes the Columbia area where damaging winds are possible. Also

6:00 p.m. – Flood warning upgraded to FLASH flood warning

Due to the intensity of rainfall falling over such a short time, the flood warning has been upgraded to a FLASH flood warning until 9 p.m. Up to two inches of rain has fallen in the past hour and another 1 to 3 inches are possible.

Remember never to drive across flooded roads and try to avoid routes near streams/creeks during heavy rainfall.

In addition to the torrential rain, these storms feature frequent, dangerous lightning.

While they are progressing to the east-northeast, they may take one to two hours to move through a particular area.

After this batch moves through, more showers and storms are possible later this evening, but there should be a pause of at least an hour or two and the additional activity should be hit or miss and generally less intense.

5:45 p.m. – Flood warning for much of Beltway region

The flood warning in effect for south Arlington, Alexandria and east central Fairfax County has now been expanded to cover the District, southeast Montgomery County, northwest Prince George’s County and north Arlington until 9:45 p.m. due to the heavy storms.

These storms are slow-movers and could unload one to three inches of rain.

5:30 p.m. – Storms erupting. Flash flood watch issued.

Radar shows numerous storms with heavy rain flaring up in the immediate D.C. region. These are slow which could put down hefty rain amounts in a short time. As such the National Weather Service has extended a flash flood watch, issued earlier for our western areas, over the rest of the region (except for Southern Maryland). The watch is in effect until 11 p.m.


(National Weather Service)

In addition, a flood warning has been issued for southeastern Arlington County, east central Fairfax County, and Alexandria until 9:15 p.m. Up to an inch of rain has fallen and another one to two inches could still fall.

From 4:09 p.m. …

Today’s reduction in heat and humidity bordered on imperceptible as it still hit 90 in Washington and felt like the mid-to-upper 90s. The wind has shifted direction, but it’s still a while until truly cooler air is here. It will finally arrive this weekend. And along with the cooler air comes more rain.

Listen to the latest forecast:

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Through Tonight: Showers and storms that are mainly to our west will head this way through the night. This is not super widespread activity, so it will remain hit-and-miss, with plenty of folks staying dry. But where it rains, it could be heavy at times. If thunder roars, head indoors. Lows are in the 60s.

View the current weather at The Washington Post.

Tomorrow (Saturday): Intermittent rain showers seem likely, especially in the afternoon and early evening. A brief period of heavy rain is possible. We’re in the cooler,  more stable air, though, so probably nothing severe will occur. Highs are mostly in the near-70 to mid-70s zone. Lows get into the 60s overnight as spotty showers remain possible.

Sunday: More periodic rain, especially in the afternoon, when it could be heavy. For now it seems that the worst may end up a bit north, so perhaps it won’t be a washout. It will cool, which isn’t a problem, given all the recent heat. Highs are in the upper 60s and lower 70s.


Lightning last evening from the Mall. (Joseph Gruber via Flickr )

See Camden Walker’s forecast through the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter and Instagram. For related traffic news, check out Gridlock.

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