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Chesapeake Bay weather for December 28: rainy, damp, and chilly on Sunday

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

Tonight: Cloudy with rain showers, mainly after midnight. Low in the lower 40s.

Sunday: Damp and chilly with occasional rain. High in the lower to middle 40s.

Sunday Night: Rain showers ending with clearing toward morning. Low in the mid 30s.

Monday: Mostly sunny with a high in the mid 40s.

Tuesday: Clouds and sun with a low in the upper 20s and a high in the upper 30s.

The extended outlook calls for a mostly sunny sky on Wednesday with a low in the mid 20s and a high n the mid 30s. Increasing clouds with a chance of snow late on Thursday. The low will be in the mid 20s and the high will be in the mid 30s. A chance of snow early on Friday. The low will be in the upper 20s and the high will be in the lower 30s.

High pressure moved to our southeast today and the clockwise flow around the high's center allowed for a southerly flow to develop across the Middle Atlantic states this afternoon. As a result, many locations in the region experienced temperatures in the 50s; however, locations right along the bay shore recorded much cooler readings. For example, while Baltimore-Washington International Airport in Maryland was in the upper 50s, Annapolis was in the lower 40s. Temperatures were also influenced by the wind direction. Richmond, Virginia experienced a temperature drop from 61 degrees to 48 degrees in two hours when the wind came off the water. As we move into the overnight hours, low pressure in the Gulf of Mexico states will move northeast toward the Middle Atlantic states and produce widespread rain throughout the region. With mild temperatures, the precipitation will fall in the form of rain. At this time, Annapolis may receive about 1/3 to 1/2 inch of rainfall by Sunday evening. Some locations may receive a bit more or less. Rainfall is expected to come to an end area-wide by Sunday night. As we move into the new week, colder temperatures will overspread the eastern states. At the same time, a coastal low may bring snow to the region by Thursday. Thereafter, significantly colder air may impact the eastern states through next weekend.

On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect from Sunday afternoon through Sunday evening. Winds tonight will come out of the south at 10 knots with waves around one foot. Visibility may be reduced in rain and fog. Winds on Sunday will come out of the east at 10 to 15 knots, and then shift to the west at 10 to 15 knots. Waves will range from 1 to 2 feet. Visibility may be reduced in rain and fog. Winds on Sunday night will come out of the west at 10 to 15 knots with gusts over 20 and waves from 1 to 3 feet. Winds on Monday will come out of the north at 10 knots with waves around one foot. Marine information is provided as general guidance. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

The average high temperature for December 28 is 42 degrees and the average low is 26 degrees. The records at Baltimore on this date are 74 degrees in 1946 and 10 degrees in 1950. Today's sunrise will occur at 7:25 and the sunset will occur at 4:51. 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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