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Boston weather forecast for Dec. 20, 2013

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Forecast discussion: A warm front has moved its way past northern New England, but we will not see the milder air until the weekend. Boston will also see rainfall instead of snowfall this weekend, washing away most, if not all, of our snow pack.

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Right now we will see some circus level clouds move in before midnight. As the night wears on, we will see lower level clouds move into our skies. With the clouds, our temperatures will remain near or slightly above freezing. As we move through Friday, it will become quite mild during the day, as highs reach the middle 40’s. Also, winds will turn to the southwest, which is always a warm wind.

A low pressure system will form along a boundary over Ohio Friday night, which will help enhance the atmosphere. We will see a few scattered showers arrive after midnight, with a few showers until dawn on Saturday. As the low passes to our north and east, a stronger low over northern Texas at the moment will bring another round of showers by sunset. Temperatures will reach near 50 degrees, further reducing our snow pack.

On Saturday night, the warm front will actually move south, towards northern Massachusetts. However, our precipitation Saturday night will remain rain. We may see some moderate rain at times, due to the close proximity of the warm front. The heavier rain remains possible through Sunday, and temperatures will remain in the middle 50’s. At this time, the models agree the precipitation will end early Monday morning.

By Monday afternoon, the cold front associated with this low will pass through New England. Temperatures will fall through the afternoon from the middle to upper 40’s to the middle to upper 20’s Monday night. At this time, Christmas Eve and Day remain snow free, as a strong high pressure system controls the entire eastern U.S. We will see some milder air arrive by Thursday, as temperatures reach the lower 40’s during the day. So, there is a slim to none chance of seeing a White Christmas this year.

72 hour forecast:

Tonight: Partly cloudy before midnight, with mostly cloudy skies after midnight. We will see a low of 32.
Friday: Cloudy skies and milder with a high of 45. Winds will come from the south-southwest at 8-12 mph.
Friday night: Overcast with scattered showers after midnight and a low of 40. Winds will come from the southwest at 10-13 mph.
Saturday: Cloudy skies with scattered showers ending before dawn. Scattered showers return by sunset. Patchy fog will be around at times. We will see a high of 50.
Saturday night: Showers with light rain at times with a low of 43.
Sunday: Showers, with light to moderate rain at times. We will see a high of 55.
Sunday night: Showers end by 1 a.m. and a low of 45.

Extended Forecast:
Monday: Partly to mostly sunny skies by the late morning. Highs expected to reach 46-49 before falling in the afternoon, lows 24-27.
Christmas Eve: Mostly sunny and colder. Highs 29-32, lows 18-21.
Christmas Day: Mostly sunny. Highs 31-34, lows 25-28.
Thursday: Partly to mostly sunny. Highs 40-43, lows 29-32.



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