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Chesapeake Bay weather for December 29: rainy Sunday on the bay

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

Today: Cloudy with occasional rain showers. High around 45.

Tonight: Mostly cloudy with a shower early, then partial clearing late. Low near 35.

Monday: Clouds and sun, breezy at times. High around 45.

Tuesday: Mostly sunny with a low in the upper 20s and a high in the upper 30s.

Wednesday: Mostly sunny with a low in the upper 20s and a high in the upper 30s.

The extended outlook calls for a mostly cloudy sky on Thursday with a chance of light sleet, snow, and rain at times. The low will be in the upper 20s and the high will be in the upper 30s. A few snow flurries early on Friday, then windy with clouds and sun. The low will be in the lower 30s and the high will be in the upper 30s. Mostly sunny on Saturday with a low around 25 and a high around 35.

Low pressure in the Gulf of Mexico states will move northeast toward the Middle Atlantic states and produce widespread rain throughout the region today and early this evening. With mild temperatures, the precipitation will fall in the form of rain. Most locations will receive about 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 mixed precipitation to the region by Thursday. At this time, the storm system is projected by computer models to be rather weak with one low moving up to our west and a secondary low developing off the Mid-Atlantic coast. This scenario is not favorable for accumulating snow in the Annapolis area. Even when temperatures are cold enough, this set-up brings very light snow transitioning to sleet and rain. Although the exact details of this system have yet to be determined, right now the prospects for snowfall are minimal through the first week of the new year. Regardless of what occurs next Thursday, chilly air from the northwest will overspread the region through next weekend.

On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect from Sunday afternoon through Sunday evening and from Monday morning through Monday afternoon. Winds today will come out of the northeast at 10 knots, then shift to the west at 10 to 15 knots with gusts over 20 knots and waves from 1 to 3 feet. Visibility will be reduced in rain and fog. Winds tonight 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 west at 10 knots, then shift to the northwest at 10 to 15 knots with gusts over 20 knots and waves from 1 to 3 feet. 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 29 is 42 degrees and the average low is 25 degrees. The records at Baltimore on this date are 77 degrees in 1984 and 2 degrees in 1917. Today's sunrise will occur at 7:26 and the sunset will occur at 4:52. 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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