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Boston weather: Heavy rain for Tuesday morning

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Forecast discussion: Boston began Monday with sunshine in the sky, but as the afternoon went on, clouds began to take over. The current radar imagery shows showers are now moving into eastern Massachusetts. Eventually, heavier rain and even an isolated rumble of thunder will move over the area during the overnight. We could see up to an inch and a half of rainfall. The heavy rain will taper off Tuesday morning, before we see showers come to an end by the late morning. We should see partly sunny skies during the afternoon, and any sunshine will help raise temperatures into the lower 60’s.

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High pressure in the Rockies will bring a strong ridge over New England Tuesday night. This will help bring strong sunshine for Wednesday, along with diminished winds. Radiational cooling Wednesday night will help bring temperatures to near freezing Wednesday night. Temperatures will be warmer on Thursday night, as increasing clouds will keep the heat from escaping into the atmosphere.

As we head into Friday, a very weak cold front will pass through Southern New England. There is the chance for some showers along the front through the day, as the front stalls just to the south of the region. High pressure will slowly kick this front out by Saturday afternoon. If there is no precipitation, we can expect just limited sunshine. High pressure will bring drier air, allowing for sunny skies on Sunday.

As we look into early next week, the long range computer models are beginning to disagree. That strong high pressure on Sunday moves over the Canadian Maritimes on Monday. However the strong ridge protects the Northeast U.S. from a couple of low pressure systems bringing some possible heavy rain to the Ohio and Tennessee River Valleys. However, the American model has the ridge weaken, allowing for showers to develop Monday night. For now, I will keep evening showers in the forecast, until I begin to see some continuity from the models.

72 hour forecast:

Tonight: Showers developing by 8 p.m., with heavy rain by 10 p.m. Patchy fog developing after midnight. We will see a low of 45.
Tuesday: Moderate to heavy rain, before tapering to showers by mid-morning. Showers end by the late morning with partial sunshine in the mid-afternoon. We will see a high of 61 with southwest winds of 14-17 mph.
Fenway Park Forecast (6:10 p.m. vs. Texas): Partly sunny, 56.
Tuesday night: Partly cloudy before dawn and breezy with a low of 42. Winds will come from the west at 14-17 mph.
Wednesday: Mostly sunny with a high of 54.
Wednesday night: Clear skies and colder with a low of 33.
Thursday: Mostly sunny with a high of 56.
Thursday night: Increasing clouds through the overnight with a low of 46.

Extended Forecast:
Friday: Overcast with possible showers arriving by the late morning. Highs 59-62, lows 41-44.
Saturday: Partly sunny with possible showers ending by the late afternoon. Highs 58-61, lows 39-42.
Sunday: Mostly sunny. Highs 60-63, lows 44-47.
Monday: Increasing clouds with possible showers by 9 p.m. Highs 66-69, lows 46-49.

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