Two-part storm due; up to half-inch of ice possible
The National Weather Service has split its forecast for the coming, two-part ice storm and expanded the area affected. Up to a half-inch of ice is possible by Wednesday morning for communities along the Pennsylvania border. A quarter-inch is possible in Baltimore.
First, there is now a Winter Weather Advisory posted tonight for all the northern tier of counties along the Pennsylvania line, as well as for Montgomery, Howard, Prince George's and Anne Arundel Counties and the northern counties of the Eastern Shore.
The Advisory is in effect from midnight Tuesday morning to noon. Along the northern border it calls for sleet beginning this evening, changing to freezing rain after midnight tonight, with one- to two-tenths of an inch of ice accumulation by Tuesday morning.
Lesser amounts - a few hundredths of an inch - are likely to the south and east, including Anne Arundel County.
The precipitation may pause during the day Tuesday, much as it did during last Wednesday's storm. But heavier accumulations of ice are forecast for the region as the freezing rain resumes later in the day.
Up to a quarter-inch of new ice is possible before it all ends Wednesday, forecasters said in a Winter Storm Watch posted for that period. The forecast ice accumulation map, however, shows up to a half-inch along the Pa. border, and a quarter-inch of more north and west of U.S. 40, including Baltimore.