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A cold night ahead...

Josh Larson @ 4:58 PM

High pressure to the north, dry air (dewpoints are presently in the teens), and cloudless skies should allow for a cold night tonight. The wildcard, however, is the winds, which, at present are blustery and 10-20mph from the Northwest. Winds will need to diminish considerably before ideal radiational cooling conditions take hold. Nonetheless, I expect that by midnight winds should become light. Low temperatures in the mid to upper 20's are likely in the city and the nearby suburbs, and in the low to mid 20's in the further north and west suburbs. It appears likely that tonight's low at National (DCA) will be colder than the lowest temperature thus far this month: 31 on March 9. However, it remains to be seen whether temperatures tonight at Dulles (IAD) will be colder than last night's (and this month's lowest) temperature of 24.

So watch for those winds to diminish at National and Dulles, and the temperatures should drop accordingly:
National Airport
Dulles Airport

Bundle up if you're going outside tonight, in any case.

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