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Chesapeake Bay weather for December 20: sunny and unseasonably mild

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

Today: Mostly sunny and mild with a high around 60.

Tonight: Mostly clear and mild with a low around 45.

Saturday: Clouds and sun with a high from 65 to 70.

Sunday: Mostly cloudy with afternoon showers & thundershowers. High in the low 70s.

Monday: Mostly cloudy with morning showers. Cooler with a high around 55.

The extended outlook calls for a mostly sunny sky on Tuesday with a low around 30 and a high around 40. Clouds and sun on Wednesday with a low in the upper 20s and a high in the lower 40s. Mostly cloudy on Thursday with a low in the lower 30s and a high in the mid 40s.

The main weather features on the morning weather map include a center of high pressure off the southeast Atlantic coast. The clockwise flow around the high is creating a southerly flow of air over the southeast and Mid-Atlantic states today. Enhancing the flow from the south is an area of low pressure in the nation's mid-section and its counter-clockwise flow. Consequently, temperatures will be warming to 60 degrees today around the bay region, perhaps a few degrees warmer over the southern bay but a few degrees cooler right along the bay shore. Saturday will be even milder with afternoon temperatures in the mid to upper 60s. A frontal system will approach the Middle Atlantic states from the northwest on Sunday. 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, low pressure will move along the front and produce widespread rain showers and even some thundershowers. 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 through Saturday afternoon. Winds today will come out of the southwest at 10 to 15 knots with gusts over 20 and waves from 1 to 3 feet. Winds tonight will come out of the southwest at 10 to 15 knots with gusts over 20 and waves from 1 to 3 feet. Winds on Saturday will come out of the south at 10 to 15 knots with gusts over 20 and waves from 1 to 3 feet. Winds on Saturday night will come out of the south at 10 to 15 knots with gusts over 20 and waves from 1 to 3 feet. Visibility may be reduced in rain showers and fog. Winds on Sunday will come out of the south at 10 to 20 knots with gusts over 25 knots and waves from 2 to 3 feet. Visibility may be reduced in rain showers and fog. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

The average high temperature for December 20 is 44 degrees and the average low is 27 degrees. The records at Baltimore on this date are 67 degrees in 1877 and 6 degrees in 1942. 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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