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Chesapeake Bay weather for December 18: sunny, breezy, and seasonably chilly

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

Today: Mostly sunny and seasonably chilly with a high around 40.

Tonight: Clear with a low in the upper 20s.

Thursday: Mostly sunny and milder with a high between 45 and 50.

Thursday Night: Mostly clear with a low in the lower to middle 30s.

Friday: More clouds than sun. Mild with a high around 55.

Saturday: Becoming mostly cloudy with a shower late. The high will be around 65.

The extended outlook calls for rain showers and possibly a thundershower on Sunday with a high around 70. Mostly cloudy with scattered showers on Monday and a high of 55. Becoming sunny on Tuesday with a high in the upper 30s.

High pressure will continue to build over Chesapeake Bay through this evening. This will result in a sunny day with occasionally gusty winds and seasonably chilly temperatures. Morning readings in the upper 20s to lower 30s will rise into the upper 30s to lower 40s this afternoon. The center of high pressure will move offshore on Wednesday and the clockwise flow of air around the high will allow for moderation in our temperatures with many locations approaching 50 degrees by Thursday afternoon. Sunshine will accompany the milder thermometer readings and will make for a nice reprieve from the recent string of cold days and winter weather. As we move toward Friday, a frontal system will approach the Middle Atlantic states from the northwest. This slow-moving front will become nearly stationary and will produce considerable cloudiness over the region on Friday and Saturday. As the front inches closer to the coast on Sunday, widespread rain showers and even some thundershowers will overspread the bay area. At the same time, mild air ahead of the front will surge northward and push the mercury into the 60s on Saturday and 70 on Sunday! As we move into next week, colder and drier air behind the front will move into the region and more seasonable temperatures will return. Highs will drop from around 70 on Sunday into the upper 30s by Tuesday!

On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect until 6 p.m. this evening. Winds today will come out the west at 10 to 20 knots with gusts over 20 knots and waves from 1 to 3 feet. Winds tonight will come out of the southwest at 5 to 10 knots with waves from 1 to 2 feet. Winds on Thursday will come out of the southwest at 10 to 15 knots with waves from 1 to 3 feet. Winds on Thursday night will come out of the southwest at 10 to 15 knots with waves from 1 to 3 feet. Winds on Friday will come out of the southwest at 10 to 15 knots with waves from 1 to 3 feet. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

The average high temperature for December 17 is 44 degrees and the average low is 27 degrees. The records at Baltimore on this date are 72 degrees in 2006, and 7 degrees in 1919. Today's sunrise will occur at 7:21 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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