PM Update: Scattered storms and downpours overnight; hot and muggy again Sunday - The Washington Post

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7:25 p.m. — Strong to severe storms northwest and southwest of the Beltway, pushing south

Two intense storms, northwest and southwest of the Beltway, have triggered severe thunderstorms warnings. The storm to northwest is just south of Clarksburg in Montgomery County and is pushing south toward Poolesville and should enter northern Fairfax County between 7:45 and 8 p.m. The storm to the southwest is just west of Manassas and Centreville and is seeping south toward southern Fauquier County.

Both storms are producing heavy rain and frequent lightning and have the potential to unleash some localized damaging wind gusts. They should remain west of the Beltway, and will probably decrease in coverage and intensity after dark.

Original forecast from 3 p.m.

Soupy is probably the best word to describe our air mass right now. Humidity levels are quite high at the moment, and they will remain high for the duration of the weekend. Thankfully, our best chance for rainfall occurs tonight, while most of us will be asleep. While temperatures will be a bit “cooler” on Sunday, the high humidity levels won’t make it feel any less, well, soupy.

Through tonight: Skies will remain mostly clear through sunset this evening. Patchy clouds will grow in numbers after dark, and some scattered thunderstorms or downpours are possible after midnight, especially south of the Potomac. Otherwise, it will be warm and muggy, with temperatures and dew point values in the low 70s. Areas of patchy fog are likely to develop as well.

Tomorrow (Sunday): Patchy fog will burn off in the late morning hours, leaving mostly sunny skies for Sunday. It will be hot, but not as hot as the past few days, with highs likely topping out in the upper 80s. But it sure will be humid, with dew point values remaining in the low to mid 70s. A few isolated afternoon/evening thunderstorms may pop up as well. It will be warm and muggy again Sunday night, with lows in the low to mid 70s.

Inland Ida flooding? Hurricane Ida will strike the Louisiana coast Sunday evening as a powerful hurricane. But after its landfall, the storm will likely track up the Tennessee Valley early next week and make an exit to the east, somewhere close to the D.C. region. And that means we are likely going to see some heavy rainfall totals over areas that have already had a very wet summer period.

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August 29, 2021 at 06:37AM
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PM Update: Scattered storms and downpours overnight; hot and muggy again Sunday - The Washington Post
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