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Chesapeake Bay weather for December 18: evening update

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

Overnight: Variable cloudiness with a low in the upper 20s. Light winds.

Thursday: Mostly sunny and milder with a high in the upper 40s to lower 50s.

Thursday Night: Generally clear with a low in the mid 30s.

Friday: Clouds and sun. Mild with a high in the mid to upper 50s.

Saturday: Becoming mostly cloudy with a shower late and a high in the mid to upper 60s.

Sunday: Cloudy with rain showers and possibly a thunderstorm. Warm with a high in the low 70s.

The extended outlook calls for clearing conditions and cooler on Monday with a low in the mid 40s and a high in the low 50s. Mostly sunny on Tuesday with a low in the lower 30s and a high in the mid 40s. Mostly sunny on Wednesday with a low in the upper 20s and a high in the mid 40s.

High pressure that provided central Maryland with sunshine and chilly temperatures today will move offshore on Wednesday. The effects of the high will be felt overnight with temperatures dipping into the mid and upper 20s by sunrise on Thursday; however, the counter-clockwise flow of air 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 from 6 a.m. Thursday through Thursday afternoon. 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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