Stiff northwest winds are sweeping moisture off the Great Lakes and dropping it as snow in the mountains to our west. The western slopes in Garrett and Allegany counties could see another 3 to 5 inches, and up to a foot more in a slice of high terrain in Allegany. Here are some accumulation reports. And more. Here's where snow is falling nationwide.

A heavy snow warning is in effect until early tomorrow in extreme western Allegany County. Wind chill advisories have also been posted in that part of the state through 10 a.m. tomorrow, as winds gust to 35 and 40 mph today and tonight.

"A WIND CHILL ADVISORY MEANS THAT VERY COLD AIR AND STRONG WINDS
WILL COMBINE TO GENERATE LOW WIND CHILLS. THIS WILL RESULT IN
FROST BITE AND LEAD TO HYPOTHERMIA IF PRECAUTIONS ARE NOT TAKEN.
IF YOU MUST VENTURE OUTDOORS...MAKE SURE YOU WEAR A HAT AND
GLOVES."

Down here in the Piedmont and Coastal Plain, we're looking for some of the coldest temperatures of the winter so far. The lows could sink into the teens Thursday night. The low for the season so far at BWI was 14 degrees, on Dec. 7. Here's AccuWeather's take on this outbreak of arctic air.

On the other hand, skies should clear a bit, bringing us a stretch of sunny days and starry nights.