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baltimoresun.com

Forecasters predicting blast of cold to start December

By Scott Dance, The Baltimore Sun

12:11 PM EST, November 20, 2012

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While a relatively mild Thanksgiving week is expected, colder air is expected to move in for the last few days of the month and the start of December.

The Climate Prediction Center in College Park is predicting a 40 percent chance of colder-than-normal temperatures in Maryland from about Nov. 27 to Dec. 3. The center uses overall climate patterns to predict general conditions from as near as about 6 days out to as far as a month or a whole season.

The climate indicator known as the North Atlantic Oscillation is expected to turn negative around that time, which means blasts of Arctic air can come southward into the mid-Atlantic and other areas of the U.S.

Normal temperatures in Baltimore for early December are highs in the upper 40s and lows around freezing, or just below.

Various weather forecasting models show cold air over much of the Northeast after Thanksgiving and into the first couple of weeks of December. It could foster some lake effect snows and, depending on blocking patterns, potentially snow for Maryland as well, according to AccuWeather's Henry Margusity.

Former TV meteorologist Justin Berk expects Maryland could be on the dry edge of some of that lake-effect snow, but there could be more where that came from in early December, he predicts on his Facebook page.

Have a weather question? E-mail me at sdance@baltsun.com or tweet to @MdWeather.