D.C. area forecast: Cool and damp start today, warm finish; heavy rain Friday night

April 18, 2013

Today’s Daily Digit

A somewhat subjective rating of the days weather, on a scale of 1 to 10.

8
Ignore the fog and drizzle early and bask in the warm dappled afternoon sun.

Express Forecast

Today: Morning clouds, possible drizzle/showers, partial afternoon sunshine. 74-78.

Tonight: Patchy fog possible. 58-62.

Tomorrow: Increasing clouds, evening t-storms. 78-82.

FORECAST IN DETAIL


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.

Warm is the word for the next two days with just enough humidity to set the stage for tomorrow night’s thunderstorms without becoming uncomfortable. Gardens get a good watering and more importantly pollen laden heavens get a good washing. The weekend is pristine with dry – almost cool – weather for those for whom the current conditions are not to their liking!

Today (Thursday): Those of you out early be mindful of pockets of fog that could pose a visibility problem. The cool air that slipped in from the north late yesterday hangs on into the morning with scattered patches of drizzle and even a few light showers. These should come to an end around mid-morning. A monster storm out west pulls our winds around to come out of the southeast and temperatures respond by climbing into the mid-to-upper 70s. Plenty of clouds cover the sky but the sun should increasingly burst through during the course of the afternoon. There’s a lesser risk clouds linger deeper into the afternoon, which could cap temperatures in the low 70s if that scenario plays out. Confidence: Medium

Tonight: Evening readings are quite pleasant in the lower 70s and overnight lows only reach the upper 50s to lower 60s. A brisk southerly breeze should keep fog limited to protected low lying areas. Confidence: Medium-High

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

Tomorrow (Friday): The Midwest storm pushes a strong cold front our way today but strong southerly winds pull up some almost summery conditions ahead of it with highs in the upper 70s to lower 80s. Humidity inches higher but not painfully so. There could be a few thundershowers sneak out ahead of the front and into the area by late afternoon, so be prepared. Confidence: Medium

Tomorrow night: The real thunderstorms (90% chance) come crashing through in the evening. While not likely to be severe, they are quite capable of significant downpours and gusty winds. They are coming through at just the right time of day for the biggest bang. Many areas could see up to an inch of rain out of these storms, helping to wipe out our deficits for the month. The front passes through with clearing skies by dawn and lows in the upper 40s to lower 50s.  Confidence: Medium

A LOOK AHEAD

Saturday and Sunday are a whole new world with bright blue skies, a lack of humidity and much cooler conditions. Highs should only be in the low-to-mid 60s. Even the breezes are mainly light. If you are out and about in the evening a jacket would be a welcome addition to the ensemble as 50s are the rule. Overnight readings get even more noticeably chilly with lows in the upper 30s to lower 40s. Confidence: Medium-High

Monday is likely to go downhill as a flow in from the Atlantic and a disturbance coming up from the south combine to increase clouds and dampness. Highs may only manage the upper 50s to lower 60s. Showers should hold off until overnight if they reach us at all. Confidence: Medium

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Ian Livingston · April 17, 2013