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PM Update: Thundershowers possible overnight, likely Saturday; clearing Sunday

Radar & lightning:Latest regional 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.

For the first time since April 17, we topped 80 degrees today thanks to push of warm air from the south. A slow-moving cold front brings a chance of thundershowers overnight, with a better chance during the day Saturday.  Sunny Sunday is definitely the weekend day for outdoor activities.

Through Tonight: Mostly cloudy skies with about even odds of showers and thunderstorms, mainly after about 8 p.m. and before 1 a.m. We remain under a warm southerly flow, meaning summerlike low temperatures of 60-65.  Outside of any, it’s quite pleasant to be out and about.

Tomorrow (Saturday): Unsettled is the best way to put it.  Showers and thunderstorms are possible at any time, though most likely from late morning onward.  Some heavy downpours are possible.  Severe weather (in the form of strong winds) isn’t terribly likely, but can’t be ruled out either, especially east of I-95, where breaks in the clouds could destabilize the atmosphere a bit.  The day is not a total washout with breaks in the rain at times, but it’s impossible to say when.  Keep an eye on radar and our Twitter feed.  High temperatures range from the mid-70s to around 80 (depending on the amount of sunshine).  Rainfall amounts average 0.25-0.5 inches, but will be locally higher and lower.

Saturday night and Sunday: Two fronts (one Saturday evening and one Sunday morning) clear and so do the clouds and rain, beginning Saturday evening between 6 and 10 p.m.  It’s refreshing Saturday night, with lows 48-56 (suburbs-city).  Sunday is mostly sunny and delightful but perhaps a little chilly for some with a steady breeze from the northwest at 10-15 mph.  Highs range from 65-70.

See Camden Walker’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.

A thundershower builds over Arlington Thursday (Kit Case via Flickr)

Pollen: Tree counts are HIGH, grasses counts are MODERATE, and mold spore counts are MODERATE to HIGH.

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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Jason Samenow · May 10, 2013

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