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Chesapeake Bay weather for December 19: cold morning then sunny and warmer

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

Today: Cold early, then sunny and warmer with a high from 55 to 60.

Tonight: Mostly clear and mild with a low around 40.

Friday: Clouds and sun with a high in the mid 60s.

Saturday: Clouds and sun. Warm with a high around 70.

Sunday: Cloudy with showers and thundershowers late. Unseasonably warm. High 70 to 75.

The extended outlook calls for clearing conditions and cooler on Monday with a low in the mid 40s and a high in the low 50s. Mostly sunny on Tuesday with a low in the lower 30s and a high in the mid 40s. Mostly sunny on Wednesday with a low in the upper 20s and a high in the mid 40s.

On this date in 2009 a major winter storm was bearing down on the Chesapeake Bay region with heavy snow. This would be the first of three blizzards to strike the Middle-Atlantic states during the winter of 2009-2010, a winter that would become the snowiest in the recorded history of weather in Baltimore. Four years later, we are starting off with some chilly temperatures. A clear sky and near-calm winds enabled readings to drop into the mid to upper 20s this morning. As we move through the day, a counter-clockwise flow of air around high pressure to our east will allow for moderation in our temperatures with many locations approaching 55 to 60 degrees by later this afternoon. As we move into Saturday, a frontal system will approach the Middle Atlantic states from the northwest. This slow-moving front will become nearly stationary and will produce considerable cloudiness over the region on Saturday. As the front inches closer to the coast on Sunday, widespread rain showers and even some thundershowers will overspread the bay area. At the same time, mild air ahead of the front will surge northward and push the mercury into the lower 70s on Sunday. Next week, colder and drier air behind the front will move into the region and more seasonable temperatures will return.

On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect until 6 p.m. this evening and a Small Craft Advisory is in effect from Friday morning through Friday afternoon. Winds today will come out of the southwest at 10 to 15 knots with waves from 1 to 3 feet. Winds tonight will come out of the southwest at 10 to 15 knots with waves from 1 to 3 feet. Winds on Friday will come out of the southwest at 10 to 15 knots with waves from 1 to 3 feet. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

The average high temperature for December 19 is 44 degrees and the average low is 27 degrees. The records at Baltimore on this date are 66 degrees in 1920 and 1931, and 6 degrees in 1989. Today's sunrise will occur at 7:22 and the sunset will occur at 4:46. Weather data courtesy of the National Weather Service. For more weather updates, please visit 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.

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