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PM Update: Isolated storms this evening, more brutal heat Friday

* Heat advisory and code orange air quality alert into this evening *

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.

The heat was hot but the humidity (dew points into the upper 70s!) was oppressive. The combination produced heat indices exceeding 105 in many locations. The juicy air has helped fuel a few isolated storms, but the sprawling heat dome has crushed most of them. Tomorrow, it’s a similar set up.

Through Tonight: There’s a 20 percent chance of isolated storms which could produce downpours and brief bursts of wind. Most of us, though, are partly cloudy and very muggy. Overnight lows range from the mid-70s to near 80 once again downtown. The air is extremely still so, unless you get a storm, don’t count on a cooling breeze.

Tomorrow (Friday): Hate to say it, but we’re looking at another day much like today. It’s hazy, hot and humid with highs again in the mid-to-upper 90s. And, yes, with the humidity (dew points in the low-to-mid 70s), heat indices likely meet and possibly cross the 105 threshold. Thunderstorm chances tick up slightly compared to today, with a 30 percent chance across the region. Winds from the south are around 5-10 mph.

See David Streit’s forecast into early next week. And if you haven’t already, join us on Facebook and follow us on Twitter . For related traffic news, check out Dr. Gridlock.

The always too hot thermometer in DuPont Circle reads 104, probably 5-8 degrees too high. (Joe Flood via Flickr)
The always too hot thermometer in Dupont Circle reads 104 Wednesday, probably 5-8 degrees too high. (Joe Flood via Flickr)

Pollen: Grass counts are MODERATE, and mold spores are MODERATE-HIGH. Tree and weed counts are LOW.

Jason is the Washington Post’s weather editor and Capital Weather Gang's chief meteorologist. He earned a master's degree in atmospheric science, and spent 10 years as a climate change science analyst for the U.S. government. He holds the Digital Seal of Approval from the National Weather Association.
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At a Glance


-- /51°
Drop 100%


41° /48°
Drop 60%


43° /53°
Drop 90%


48° /57°
Drop 60%


38° /51°


35° /51°
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Jason Samenow · July 18, 2013

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