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Chesapeake Bay weather for December 30: becoming sunny and breezy

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

Today: Becoming mostly sunny and breezy at times. High in the lower 40s.

Tonight: Mostly clear. Low in the upper 20s.

Tuesday: Variable clouds with a few flurries or rain drops. High in the upper 30s to lower 40s.

Wednesday: Mostly sunny with a low in the upper 20s and a high in the upper 30s to lower 40s.

Thursday: Mostly cloudy with a chance of mixed rain and snow. Low around 30. High around 40.

The extended outlook calls for sunny and cold conditions on Friday with a low in the upper 20s and a high in the lower 30s. Sunshine on Saturday with a low in the mid 20s and a high in the mid to upper 30s. Clouds and sun with afternoon showers on Sunday. The low will be in the lower 30s and the high will be in the mid to upper 40s.

After a wet Sunday that produced more than an inch of rainfall across the region, high pressure will build over the area today. As a result, we can expect a mostly sunny sky with cool, but seasonable, temperatures as highs reach the lower 40s. Breezy conditions at times may make it feel cooler at times. Overnight, temperatures will fall back into the upper 20s. On Tuesday, a weak cold front will push through the region and produce a few clouds and perhaps a stray snow flurry or rain shower. Sunshine returns on Wednesday in the wake of the cold front. Meanwhile, two areas of low pressure are expected to develop on Thursday: one to the west of the mountains and a secondary low along the Middle 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. Energy will transfer from the first low to the secondary low, but this transfer typically leaves the bay region in a dry slot while producing moderate to heavy snow over the New England states. 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 on Thursday, chilly air from the northwest will overspread the region on Friday with highs struggling to break above the freezing point. The shot of cold air will be short-lived with temperatures recovering into the 30s on Saturday and 40s on Sunday.

On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect until 6 p.m. this evening and a Small Craft Advisory is in effect from Tuesday morning through Tuesday afternoon. Winds today will come out of the northwest at 10 to 15 knots with gusts over 20 knots and waves from 1 to 3 feet. Winds tonight will come from the northeast at 10 knots with waves around one foot. Winds on Tuesday will come from the southwest at 10 to 15 knots with gusts over 20 knots, then shift to the west. Waves will be from 1 to 3 feet. Winds on Tuesday night will come from the northwest at 10 to 15 knots with gusts over 20 knots and waves from 1 to 2 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 30 is 42 degrees and the average low is 25 degrees. The records at Baltimore on this date are 68 degrees in 1990 and -3 degrees in 1880. Today's sunrise will occur at 7:26 and the sunset will occur at 4:53. 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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