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Evening update: winter storm warning continues for Baltimore

National Weather Service forecast map
National Weather Service forecast map
Map courtesy National Weather Service

Brian's exclusive forecast for Baltimore, Annapolis, and northern Delmarva:

*The National Weather Service has issued a Winter Storm Warning for Baltimore, Annapolis, and Delmarva until 2 p.m. Monday afternoon*

Tonight: Snow. The snow may be heavy at times south of Baltimore. The low will be in the upper 20s.

Monday: Snow early, then gradual clearing. Cold with a high around 32. Total snowfall accumulation of 4 to 8 inches.

Monday Night: Clear and cold with a low around 20.

Tuesday: Sunny and cold with a high in the upper 30s.

The extended forecast calls for clouds and sun on Wednesday with a low in the upper 20s and a high in the mid 40s. Clouds and sun on Thursday with a low around 30 and a high in the mid 40s. Mostly sunny on Friday with a low around 30 and a high in the upper 40s.

This time yesterday we were coming off daytime highs that reached the upper 60s to 70 degrees in central Maryland, and now moderate to heavy snow is falling across the region at 10 p.m. An area of low pressure is currently developing to our southwest and will continue to track east/northeast toward eastern North Carolina. Precipitation from this low will override cold, dry air at the surface and produce afternoon and evening rain showers on Sunday that will mix with, and change to snow by late evening in Baltimore, Washington, and Annapolis. At this time, it looks as though the heaviest snow will fall in the Washington and Annapolis areas with a general swath of 4 to 8 inches. A lighter accumulation of 2 to 4 inches is expected in the Baltimore area and northward to the Mason-Dixon line. Snow will taper to flurries on Monday morning, and snow-covered roads will become wet due to the high angle of the March sun. However, it will remain windy and cold throughout the day with highs only reaching 32 degrees (the average high this time of year should be in the lower 50s.) Another cold day is anticipated on Tuesday with lows in the upper 10s to lower 20s and highs only in the upper 30s.

On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect from 6 p.m. this evening through Monday afternoon. Winds tonight will come out of the northeast at 10 to 15 knots with gusts over 25 knots and waves from 1 to 3 feet. Visibility may be reduced in rain, snow, and fog. Winds on Monday will come out of the northeast at 10 to 15 knots with gusts over 25 knots and waves from 1 to 3 feet. Visibility may be reduced in snow and fog. Winds on Monday night will come out of the northeast at 10 knots with waves around one foot. Winds on Tuesday will come out of the northeast at 10 knots with waves around one foot. Marine information is provided only as a guide. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

For more weather updates, please visit my web site www.chesapeakebayweather.com, my Chesapeake Bay Weather page on Facebook, and if you're heading to Ocean City feel free to check out my Ocean City MD Weather page on Facebook. You can also follow me on Twitter @chesbayweather.