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Boston weather: Scattered showers on Friday

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Forecast discussion: Boston received bright sunshine on Thursday, thanks in part to a high pressure system offshore in the Atlantic. Temperatures were seasonable, thanks to southwest winds. As we go into tonight, temperatures will remain mild, for two reasons. First, we will see increasing clouds during the overnight, helping to keep the heat absorbed from going back into the atmosphere. Second, winds will remain windy through the overnight. A cold front now east of the Great Lakes will begin to move towards Southern New England. We will see scattered showers by the middle of Friday morning. It will become more isolated by the afternoon, before another round of showers arrives Friday night. The showers will continue into early Saturday morning, but we should wake up to partly sunny skies, with mostly sunny skies by the afternoon.

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We will see good weather right into Sunday evening. The high will slowly move into the Atlantic, and a ridge will protect the east coast from a strong cold front forming in the central U.S. Monday afternoon. As the front inches closer, we will see increasing clouds Monday night. You will notice that Monday will be rather warm, as highs will reach the upper 60’s.

As we go into Tuesday, the computer models are still unsure when the front will be coming through Southern New England. The American model believes it will not pass through until Tuesday night. The European model suggests it will be sooner, around Tuesday afternoon. For now, I will remain with the American model, as it has been very consistent in its timing the last two model runs. Thanks to colder air behind the front, the heavy rain may have some rumbles of thunder as well. Once the front passes, a strong high pressure system will bring some very cold air into New England. Temperatures will fall into the lower 50’s for highs on Wednesday, and near 50 degrees next Thursday.

72 hour forecast:

Tonight: Clear skies give way to increasing clouds after midnight. It will remain breezy with a low of 45.
Friday: Overcast with scattered showers by mid-morning. We will have a high of 65 with west winds of 11-14 mph. Showers return by sunset.
Friday night: Scattered showers with a low of 45. Winds will shift to the northeast at 6-9 mph.
Saturday: Isolated showers until the early morning, with mostly sunny skies by the late morning. We will see a high of 62.
Saturday night: Partly cloudy with a low of 44.
Sunday: Mostly sunny with a high of 65.
Sunday night: Partly cloudy with a low of 51.

Extended Forecast:
Monday: Mostly sunny with increasing clouds during the evening. Highs 69-72, lows 51-54.
Tuesday: Showers by the early morning, with light rain in the afternoon, and moderate to heavy rain in the evening. Highs 58-61, lows 39-42.
Wednesday: Heavy rain in the early morning, tapering to showers and ending by mid-morning. Sunny skies are expected and much colder during the morning. Highs 49-52, lows 34-37.
Thursday: Mostly sunny. Highs 47-50, lows 35-38.

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