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Updated forecast: Storms to sweep through District, northern suburbs near midnight; hot on Tuesday

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Radar courtesy MyRadar | © OpenStreetMap contributors

11:20 p.m. — Storms weaken but will push across Beltway area and northern suburbs next hour

After peaking in intensity in central Loudoun County, the storms have weakened as they’ve neared the Beltway. They’ll cross the Beltway area and areas just to the north over the next hour with some downpours, lightning and gusty winds but should not be severe.

This is our last update for the night. Scroll down for the forecast through tomorrow.

10:45 p.m. — Severe thunderstorm warning for eastern Loudoun, northern Fairfax and southern Montgomery County until 11:30 p.m.

Radar shows a storm with very heavy rain and potentially damaging wind gusts just west of Ashburn. It’s headed east at 35 mph and Sterling, Great Falls and Potomac are in its path, all of which are under a severe thunderstorm warning.

10:35 p.m. — Storms in Loudoun County sweeping east toward District and northern suburbs with downpours, gusty winds possible

Radar shows a line of showers and storms just south of Frederick, Md. to just north of the Plains in Virginia — the heaviest activity is in west central Loudoun County just east of Purcellville, which is under a severe thunderstorm warning. This storm should move into Leesburg shortly and then reach Ashburn, Va. and Poolesville in Montgomery County around 10:45 p.m. Very heavy rain and gusty winds are likely, along with lightning.

Should the storm hold together, it’s pointed at the Interstate 270 corridor and could pass through between 11 and 11:30 p.m. It could also extend into northern Fairfax County and affect the District (especially upper northwest) in that window as well.

Original forecast

Not a bad start to August. I like to think of the month as already having turned the corner from summer’s heat. Whether or not that’s true — it is based on averages but not always on weather — the thought helps. Today’s highs in the mid- and upper 80s were pretty close to average for the date. Humidity was enough to be felt but not too much of a bother.

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Through Tonight: Skies are partly cloudy through the night with a passing shower or storm possible. Also, a patch or two of fog may develop in the typically foggiest locales like a nook or cranny near water. Lows range from near 70 to the mid-70s. Winds are light from the south-southwest.

View the current weather at The Washington Post.

Tomorrow (Tuesday): It’s another day filled with lots of sun. In early August, that usually means it’s going to be hot. Temperatures rising to highs near 90 are a little above average. Nothing notable, though. Winds are out of the southwest around 10 mph, with occasionally higher gusts. Humidity makes it feel a few degrees warmer than it is but is not exceptionally high.

See Jason Samenow’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.

Pollen update: Mold spores are high. The other main allergens are low.

Flood rescue: During the summertime monsoon in the Desert Southwest, intense flooding can seemingly come from nowhere. Last week offered up a number of flood events in the region. A police rescue was perhaps the most intense. It was caught on body cam last Friday in Arizona.

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