Clear skies and calming winds could combine to produce a hard freeze tonight in portions of the state west of the urban corridor. The National Weather Service forecast office in Sterling, Va. hasn't posted any frost or freeze warnings yet (except in Cecil County and on the upper Eastern Shore), but there is a "Hazardous Weather Outlook" noting that:

"TEMPERATURES WILL DROP TO THE MID 30S LATE TONIGHT WEST OF
INTERSTATE 95...WHICH MAY PRODUCE A KILLING FROST."

UPDATE: The NWS this afternoon issued a frost advisory for all counties north and west of Baltimore, including northern Baltimore, Carroll, Howard, Frederick, Montgomery and Washington counties:

"CLEAR SKIES AND LIGHT WINDS WILL ALLOW TEMPERATURES TO DROP INTO THE
LOWER AND MIDDLE 30S ACROSS THE WESTERN SUBURBS OF WASHINGTON DC AND
BALTIMORE...THE CENTRAL VIRGINIA FOOTHILLS AND PORTIONS OF THE
EASTERN PANHANDLE OF WEST VIRGINIA. AS A RESULT...AREAS OF FROST
ARE EXPECTED TO DEVELOP OVERNIGHT AND EARLY WEDNESDAY MORNING.

"PRECAUTIONARY/PREPAREDNESS ACTIONS...

"A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED."

The forecast low for BWI tonight is 37 degrees, but that drops off quickly to 33 degrees in Westminster, 32 in Shrewsbury, Pa., and in Poolesville, Md.

Thursday night may be even colder, with a low of 35 at BWI, and below freezing well west of the city. There are snow showers in the forecast for Garrett County late Wednesday and Thursday.  

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