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Posted at 3:30 PM ET, 08/26/2008

PM Update: Cool and Somewhat Cloudy

By Ian Livingston

Increasing odds of showers Wednesday

Cooler and drier air has settled into the area for the time being, and highs in the upper 70s to near 80 today are more comparable to averages for mid-September. Cloudiness that held tough through much of the morning has broken a bit this afternoon. It has been almost two weeks since many have received measurable rain, and for some (if not all) this streak may end tomorrow as the remnants of Tropical Storm Fay enter the picture.

Tonight: Partly cloudy and cool conditions will persist overnight, with more clouds the further south and west of D.C. you go, and less clouds the further north and east. Temperatures should drop into the mid 50s for the suburbs and to the low 60s in the city.

Tomorrow: A front that passed through yesterday will come back north and interact with moisture from the storm formerly known as Fay. This will bring an increased risk (50% chance) of scattered showers or thunderstorms by tomorrow afternoon, though the heaviest and steadiest rain may stay west of the region. With lots of clouds around, temperatures are likely to only rise into the mid 70s for highs.

See Matt's full forecast through the weekend. See NatCast for the outlook for tonight's game, SkinsCast for Thursday's preseason game, and the latest on Hurricane Gustav.

By Ian Livingston  | August 26, 2008; 3:30 PM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   StumbleUpon   Technorati   Google Buzz   Previous: Gustav Could Become a Giant
Next: NatCast: Kinda Cool ... Showers?


Can anybody explain how this happens:

"A front that passed through yesterday will come back north and interact with moisture from the storm formerly known as Fay."

I think I have a basic understanding of what causes a cold front, but what does it mean when a front interacts with residual moisture from another storm? And is it Fay's influence that will cause the front to move back north or something else?

Posted by: Laura in NWDC | August 26, 2008 5:38 PM | Report abuse

Laura-- The cold front which brought us the delightful day today stalled to our south. The remnants of Fay are going to essentially be intercepted by that front. Said front is going to left back north as a warm front. This is common when warm, moist air masses build to the south during summer and lift north displacing more transient cool air. The presence of Fay's tropical moisture no doubt contributed to the airmass pushing northward.

Posted by: Jason, Capital Weather Gang | August 26, 2008 11:00 PM | Report abuse

Latest NHC update brings Gustav down to tropical storm status, with 70 MPH max sustained winds.

(I'm posting here because of all the clutter on the main Gustav entry.)

Posted by: Model Monkey | August 26, 2008 11:03 PM | Report abuse

Thanks Jason!

Posted by: Laura in NWDC | August 27, 2008 10:07 AM | Report abuse

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