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Posted at 05:00 AM ET, 09/17/2012

D.C. area forecast: Clouds build today; stormy Tuesday, more fall splendor beyond

EXPRESS FORECAST

Today: Mostly cloudy, a little humid. 75-80. | Tonight: Chance of scattered showers. 62-67. | Tomorrow: Variably cloudy, strong storms possible. 75-80. | Get Express Forecast9 by E-mail

TODAY'S DAILY DIGIT

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


Increasing clouds and humidity, but decent temps. Rain waits ‘til tonight for most. Get the Digit on Twitter| Discuss on Facebook

FORECAST IN DETAIL


We’ve just concluded an incredible 8-day streak with no rain, little humidity and extaordinarily comfortable temperatures. We keep the comfy temps and even the rain holds off most of today, but it turns stormy tonight and especially Tuesday. Then we start another stretch of great weather Wednesday, but a notch cooler than what came before.

Today (Monday): We may start the day with some sunshine, but it should become mostly cloudy by afternoon if not sooner. Aside from a sprinkle or two (especially south of D.C.), it remains dry during the daylight hours for most, with highs 75-80. Humidity slowly builds during the day towards moderate-to-high levels by evening. Winds are from the south at 5-10 mph. Confidence: Medium-High

Tonight: Scattered showers are likely (50-70 percent chance), and possibly a thunderstorm, as moisture surges north ahead of an incoming cold front. The highest odds of rain are west of D.C., with closer to 50/50 odds along and east of I-95. A southerly push of air holds overnight lows in mid-to-upper 60s in many spots. Confidence: Medium-High

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

Tomorrow (Tuesday): Showers and thunderstorms are likely, especially during the afternoon and evening as strong cold front marches into the region. A few storms may be severe with damaging winds. Heavy rains (over 1”) are possible in many areas. Skies are variably cloudy, with some intervals of sun possible. Should sunshine materialize, that will further destabilize the atmosphere and increase the risk of severe storms. Highs are 75-80 with moderately high humidity. Confidence: Medium

Tomorrow night: Storms decrease in coverage and intensity after 8-10 p.m., with partial clearing. It turns cooler, with lows 55-60 (suburbs-city). Confidence: Medium-High

A LOOK AHEAD

Wednesday through Friday are quite nice although a bit chilly at times, especially at night. Breezes from the north (where high pressure is focused) hold day time highs in the low-to-mid 70s with overnight lows as cold as 40-45 in the colder suburbs with low-to-mid 50s downtown. Skies conditions are generally partly cloudy. The only wild card is if Tuesday’s front stalls near the coast which could keep more clouds around around D.C. and points east (especially early in this Wed-Fri period). Confidence: Medium

On Saturday , the next cold front comes through which could (20 percent chance) produce some showers at some point. But right now, the front doesn’t look to have much moisture to work with. So, the day looks to be mostly dry, with highs in the mid-to-upper 70s. Partly cloudy Saturday night with lows 50-58 (suburbs-city). Confidence: Medium

Sunday looks good from this vantage point with high pressure in control meaning highs 70-75 and partly sunny skies. Confidence: Medium

By  |  05:00 AM ET, 09/17/2012

Categories:  Forecasts

 
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