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Chesapeake Bay weather for December 17: few rain or snow showers

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

Today: A few rain or snow showers. High 40.

Tonight: Considerable cloudiness with a low in the mid 30s.

Wednesday: Clouds and sun with a high in the low 40s.

Wednesday Night: Clear and chilly with a low in the upper 20s.

Thursday: Clouds and sun. Milder with a high near 50.

Friday: Clouds and sun with a high in the upper 50s.

The extended outlook calls for a mostly cloudy sky on Saturday and Sunday with occasional rain showers. The low will be in the mid 40s and the high will be in the mid to upper 60s. Mostly cloudy on Monday with scattered showers and a high in the mid 50s.

A cold front will move from west to east across the bay region today. Upper level disturbances will produce scattered snow and/or rain showers, especially across northern Maryland. No accumulation is expected as these "clipper" systems are starved of moisture and move quickly. High pressure will build over the region on Wednesday and provide a sunny, but seasonably chilly, day with highs only in the upper 30s. The area of high pressure will move offshore and a southerly flow will develop over the Middle Atlantic and northeast states. This will signal a pattern shift and a period of much warmer temperatures can be expected so that highs will reach the 50s on Thursday and Friday. Later in the week a cold front will approach the region from the west, and the southerly flow will become stronger in advance of the front. Additionally, showers will break out over the weekend as the slow-moving front traverses across the Appalachian Mountains and over the Chesapeake Bay. The clouds and showers on Saturday and Sunday will be accompanied by temperatures in the 60s, perhaps even the lower 70s across southern Maryland into southeastern Virginia and the Virginia Eastern Shore. Next week, cooler air is expected to overspread the eastern states.

On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect from late tonight through Wednesday afternoon. Winds today will come out of the west at 10 knots with waves around one foot. Winds tonight will come out of the northwest at 10 to 15 knots with gusts over 20 and waves from 1 to 2 feet. Winds on Wednesday will come out of the west at 10 to 15 knots with gusts over 20 and waves from 1 to 3 feet. Winds on Wednesday night will come out of the southwest at 10 to 15 knots with gusts over 20 and waves from 1 to 2 feet. Marine information is provided only as guidance. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

The average high temperature for December 17 is 45 degrees and the average low is 28 degrees. The records at Baltimore on this date are 68 degrees in 1984, and 5 degrees in 1951. Today's sunrise will occur at 7:20 and the sunset will occur at 4:45. 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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