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Chesapeake Bay weather for December 4: mostly cloudy and mild followed by rain

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Brian's exclusive forecast for Annapolis: Mostly cloudy with a slight chance of a shower as well as areas of fog. Mild with a high in the mid to upper 50s. Southeast wind around 5. Cloudy tonight with areas of fog and mist. Mild with a low in the upper 40s. Southeast wind around 5. Cloudy on Thursday with occasional rain showers and a high in the mid to upper 60s. Showers on Thursday night and Friday. Mild with lows in the low 50s and highs around 60. Scattered showers on Friday night and turning colder with a low in the upper 30s. Clouds and sun on Saturday. Colder with a high in the lower 40s. Becoming cloudy on Sunday with a good chance of snow, sleet, and freezing rain. The high will be in the lower 30s. The extended forecast calls for rain showers on Monday with a high in the mid 40s. Sunny and colder on Tuesday with a high in the upper 30s. Sunny and cold on Wednesday with a low in the lower 20s and a high in the lower 30s.

Temperatures this morning range from the upper 30s to lower 40s around Baltimore to the mid and upper 40s around Richmond and Norfolk. The sky is mostly cloudy with areas of fog begin reported, especially in southeast Virginia. High pressure offshore will create a mild, southerly flow over the region today. Meanwhile, a warm front will move from south to north across the bay this evening, and this will allow even milder air to overspread the area. The moist, southerly flow of air will create considerable cloudiness, fog, and mist as well as unseasonably mild temperatures. Lows by Thursday morning will be around the average high for this time of year (upper 40s.) A cold front will move from west to east on Friday and produce rain across the region From late Thursday night through early Saturday morning. Temperatures will gradually begin to cool from highs in the upper 60s on Thursday, around 60 on Friday, and the lower 40s on Saturday. Cold high pressure builds into the Middle Atlantic region on Sunday morning, sending temperatures below freezing. At the same time, an area of low pressure over the southern states will develop and move toward the area. Moisture ahead of the low will overrun the sub-freezing temperatures at the surface, causing widespread snow, sleet, and freezing rain to develop on Sunday. The exact precipitation type, amount, and duration are yet to be determined, but a prolonged period of frozen precipitation is possible with significant icing in some areas by Sunday night.

On the Maryland portion of Chesapeake Bay, there are no advisories in effect for today. Winds on Wednesday night will come out of the south at 5 to 10 knots with waves less than one foot. Winds on Wednesday night will come out of the south at 5 to 10 knots with waves less than one foot. Winds on Thursday will come out of the south at 5 to 10 knots with waves less than one foot. Visibility may be reduced by light rain or mist on Wednesday and Thursday. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

The average high temperature for December 4 is 49 degrees and the average low is 31 degrees. The records at Baltimore on this date are 74 degrees in 1982 and 13 degrees in 1966. Today's sunrise will occur at 7:10 and the sunset will occur at 4:43. 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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