From the ABC 7 Weather team

Big changes over the next few days in D.C.

September 14, 2011 - 12:43 PM
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Highs in the 80s today, 70s tomorrow, 60s Friday.

This Afternoon: Mostly Sunny, Isolated PM Storm

Highs: Upper 80s | Wind: SW 4-8 m.p.h.

Overnight: Stray Storms, Partly Cloudy

Lows: 60s | Wind: SW 5 m.p.h.

Thursday: Mostly Cloudy, T-Showers Possible, Breezy

Highs: Mid to Upper 70s | Wind: NNW 10-20+ m.p.h.

A weak cold front will move into the region today, bringing with it the chance for an isolated storm this afternoon. High temperatures should be very warm in the upper 80s. Tonight, a stray storm will continue to be possible as energy slides east ahead of the front. Thursday will see a continued chance for showers and thunderstorms. High temperatures should be cooler in the mid 70s as more clouds move overhead and a breezy northwesterly wind helps usher in a cooler airmass. Winds may be gusty at times Thursday afternoon as the front moves through the area.

High pressure will gain control of the northeast on Friday, while the D.C. area lies in a bit of a questionable area. This is the time where our region can get an easterly flow off the Atlantic which results in clouds and cool temperatures. There is a chance this could occur during the day Friday and into the weekend. The set up is called Cold Air Damming, when clockwise flow around the high helps dam the cooler air along the Blue Ridge and ultimately results in cloudy conditions to the east of the mountains. Our forecast is for partly sunny skies on Friday with highs in the upper 60s to near 70 degrees. The weekend has the biggest question marks with it as it relies on the positioning of the high pressure to the north. We are expecting partly cloudy skies each day with highs around 70 degrees. As this situation continues to materialize, we'll keep you updated if we see more of a reason to go with a forecast for more CAD.

 

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