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PM Update: Storms pull away; another round possible on Thursday

Radar & lightning: Latest D.C. area radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

It wasn’t too hot out today — right around average really — but the humidity helped make it feel a bit worse. Highs made the mid-to-upper 80s most spots before showers and storms started to roll out of the hills. They knocked temperature back into the 70s. Those showers and storms are now moving away from the area, but another round is possible on Thursday.

Through Tonight: Although the main batch of showers and storms has pushed to our south and east, an isolated shower can’t be fully ruled out this evening (10-20% chance). By the time we get near or after sundown, it’s just partly cloudy and muggy. Lows are mostly in a 66-72 range. Winds are from the southeast around 5-10 mph.

Tomorrow (Thursday): If you’re a fan of typical D.C. August, this is your day. Partly cloudy, fairly hot, and rather humid. We’re into a bit of an active pattern aloft, with little spokes of energy coming by almost every day. So, some strong afternoon or evening storms are possible (40-50% chance). It’s hard to say how widespread they’ll be, but at least isolated to scattered seems reasonable. Highs rise toward 90 degrees. Still summer!

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

Pollen update: Weed pollen and mold spores are low/moderate. Tree and grass pollen is low.

Sunset on August 19 from Chevy Chase. (Kit Case via Flickr)

How does it feel: Ever wonder how heat index, wind chill, or “real feel” got started and entered into common forecast parlance? Wonder no more after reading this Slate piece on the subject.

Ian Livingston is a forecaster/photographer and information lead for the Capital Weather Gang. By day, Ian is a defense and national security researcher at a D.C. think tank.
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Angela Fritz and Jason Samenow · August 20, 2014

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