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Posted at 05:00 AM ET, 07/03/2012

D.C. area forecast: Mostly sunny with rebuilding heat and humidity, isolated storm chance

EXPRESS FORECAST

Today: Mostly sunny, more humid, and storm chance. 93-97. | Tonight: Partly cloudy, muggy. 68-75. | Tomorrow: Hazy, hot, humid with t-storm chances. 94-98. | Get Express Forecast by E-mail

TODAY'S DAILY DIGIT

A somewhat subjective rating of the day’s weather, on a scale of 0 to 10


Here we go again. Incremental bump up in heat & humidity increases discomfort. Matt, CWG. Get the Digit on Twitter| Discuss on Facebook

FORECAST IN DETAIL


Yesterday’s tiny respite from sauna-like conditions shifts into reverse today. We’re headed back towards another brutal peak in heat and humidity late this week. By the time we reach the weekend, we could be feeling those 100-degree temperatures again. But what about storms? We seem to carry along a slight risk each day with the best chances on July 4 and Sunday, when a significant cool front may slide our way.

Today (Tuesday): Pop goes the dew point. Mostly sunny skies with increasing heat and humidity today. Yesterday’s dew points were at more comfortable levels in the upper 50s to around 60. Today, we expect mid-to-upper 60s for dew points as high temperatures advance up into the middle 90s. Light winds from the southwest are pulling in that more humid air mass. I can’t forget a 30% chance of a roving thunderstorm. Confidence: Medium-High








What is the Storm Threat Level?

Tonight: Partly cloudy and muggy with a chance (30%) of an evening thunderstorm. Lows in the upper 60s in the cooler areas to the middle 70s in the city. Light winds from the southwest. Confidence: Medium-high

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend...

Tomorrow (Independence Day): Firecrackers feel at home on this hot holiday. Partly to mostly sunny skies should prevail, but an increased risk (40%) of mainly afternoon/evening thunderstorms complicates the story. I don’t expect a washout of a day, but this air mass can pop some of its own fireworks shows in spots. High temperatures should push their way into the mid-to-upper 90s. And we have light, hot breezes from the west and southwest. Confidence: Medium-High

Tomorrow night: Evening storms (40% risk again) could disrupt some displays and other outdoor activities, so keep a watch out for conditions in your area (we’ll do our best too!). Otherwise, partly to mostly cloudy skies obscure the night a bit and keep the muggy/warm weather in place. Lows only in the 70s. Confidence: Medium

A LOOK AHEAD

Thursday continues our summer heat wave with highs in the mid-to-upper 90s under mostly sunny skies and moderate-to-high humidity levels. Thursday night is mega-muggy with mid-upper 70s for lows under partly cloudy skies. Confidence: Medium

Friday and Saturday are the hottest days of the forecast period with upper 90s to low 100s expected. Partly to mostly sunny skies dominate, but we run the slight risk (~20%) of isolated thunderstorm activity. As of right now, we don’t see any repeats of the thunderstorm-complex-meets-record-heat mid-air collision from last weekend. And I think for now, we stay just below the 102-103 records in Washington, D.C. on these days. Very muggy overnight conditions with still some slight storm risks. Lows in the 70s to some 80s in the city. Confidence: Medium

Sunday brings a possible game-changing cold front. If everything works as modeled, we could set the stage for a more seasonal or even slightly cooler pattern at times next week. The cold front brings partly cloudy skies with possible showers and thunderstorms. We might need to watch out for some severe weather here. Highs may still manage to build into the low-to-mid 90s, but there are cooler risks if clouds/precipitation build in faster. Confidence: Low-Medium

By  |  05:00 AM ET, 07/03/2012

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