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Summer Officially Here, Its Heat Already in Full Swing

Dan Stillman @ 11:25 PM

The first day of summer brings a continuation of midsummer-like weather to the DC metro area. High temperatures will continue to threaten 90 degrees through Friday, with increasing humidity each day. The threat of showers and thunderstorms also increases significantly by Friday and possibly through the weekend. The forecast details follow ...


Forecast Confidence: High-Very HighQuite similar to yesterday. With high pressure in control, skies will be mostly sunny as temps reach a high near 90. Humidity levels will be in the tolerable range, at least by Washington standards. Overnight, a few clouds as higher humidity begins to stream in from the south. Low temps around 70 in town, mid 60s in the burbs.


Forecast Confidence: HighYou'll notice the increase in humidity. High pressure moves offshore, allowing southerly winds to bring in warmer and moister air. It'll be partly to mostly sunny and low 90s are probable -- some locations could reach 95. Building late afternoon clouds could yield an isolated evening thunderstorm (I'd put the chance at 25%). Overnight, partly cloudy and a shower or thunderstorm is possible with lows in the low-to-mid 70s.


Forecast Confidence: MediumPartly sunny early, then increasing clouds as a cold front approaches from the northwest. The humidity remains high, as do temperatures that should max out in the upper 80s to around 90. Showers and thunderstorms are a decent bet at some point on Friday, the hardest question is when? I think it'll be later rather than earlier, with the best chance during the late afternoon and evening hours. Overnight, scattered showers and thunderstorms may continue with a low near 70.

The Weekend

Forecast Confidence: MediumLooks problematic, as the front may stall out near us. I'm calling it partly cloudy and fairly humid with a 40% chance of showers and thunderstorms on both days, and highs in the low 80s. While precipitation is more likely in the afternoon and evening, I wouldn't rule out the chance of rain during other times as well. Because it's hard to gauge exactly where the front where stall out, there is some uncertainty with this forecast. Check back for updates as the weekend gets closer.

Booz Allen Forecast

Booz Allen Classic logoA warm, sunny day to start the Booz Allen Classic, which gets underway with today's Pro-Am. Those making it out to TPC Avenel in Potomac for the morning tee times -- starting at 6:40am -- will find temps rising from an early-morning low in the mid 60s into the upper 70s by mid-morning (10 am). With the final groups teeing off at 2 pm, the field should be finishing play as temps reach a late afternoon high near 90 with tolerable humidity.

We'll continue to provide Booz Allen forecasts as the week goes on. First round play begins tomorrow (as does an increase in humidity), with the final round scheduled for Sunday.

Kid After My Own Heart

I've always thought there should be more tracking of forecast accuracy, and would like to do more of this myself, both with's forecasts and with those by other outlets. A 13-year-old Pennsylvania boy is doing his part. John Columbia III tracked the accuracy of forecasts on local (southwestern PA) TV stations for nine months, finding KDKA's to be the best. Columbia's project earned him third place in a regional science fair, and also made him eligible to compete in a national competition. If all goes well, he could end up here in D.C. in October as a finalist.


Washington Post science writer Juliet Eilperin answered questions on the future of Earth's oceans and environment. The online chat was part of the Post's Beyond the Future series.

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