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Baltimore weather for March 16: sunny Sunday, snowy Monday

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 Weather Advisory for Baltimore and a Winter Storm Warning for Annapolis from 7 p.m. Sunday evening through 2 p.m. Monday afternoon*

Today: Sunny early, then increasing clouds. Much colder with a high in the lower 40s.

Tonight: Rain changing to snow. 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.

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.

Since yesterday's highs that reached the upper 60s to near 70 degrees, the mercury has dropped into the upper 30s this morning as a late-winter surge of cold air moves into the region from Canada. Highs will nudge into the lower 40s this afternoon, but dew point values will remain below freezing. This indication of dry, cold air will set the stage for snowy Sunday night and Monday morning on Chesapeake Bay. 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 3 to 6 inches. A lighter accumulation of 2 to 4 inches is expected in the Baltimore area. 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 today will come out of the north at 10 knots with waves around one foot. 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.