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Boston weather: Wet weather ahead this weekend

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Forecast discussion: A ridge of high pressure from the south gave Boston some sunshine early Friday morning, looking like a spring day. However, the winds began to shift from the northwest to the southeast, creating a sea breeze. This helped create overcast skies, with the colder air off the water meeting with the warmer air already overhead. We will continue to see cloudy skies for most of the weekend, with wet weather for all of Saturday.

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A low pressure system over eastern Ohio will begin to develop a second low pressure center along the triple point of a cold front, warm front, and occluded front during the overnight. The second low will pass just to our south early Saturday morning. We will see showers arrive by 4 a.m. and continue into the early afternoon. During the mid-afternoon, we may see a brief period of dry weather. However, the showers will return, as the main low begins to move over Southern New England. The primary low will finally move offshore by late Sunday morning, and all rainfall will come to an end. We will see some limited sunshine for the rest of the daytime.

High pressure will bring the sunshine back for Monday, and temperatures will be in the upper 50’s. By Tuesday evening, a strong low pressure system in the central U.S. will pick up moisture off the Gulf of Mexico. The high will eventually break down by Wednesday, allowing showers to arrive in the morning. Right now, the computer models are unsure how to handle the system after Wednesday. The main low will become stationary over the Great Lakes. This will allow the cold front to stay along the east coast, with a series of low pressure systems to ride up along the front. The American model is showing heavy rain and possible thunderstorms for Thursday, with more showers and light rain on Friday. The European model pushes the cold front out to sea, giving us some dry weather for Friday. So, my confidence in the forecast after Wednesday night is low at this time.

72 hour forecast:

Tonight: Increasing clouds with showers arriving by 4 a.m. We will have a low of 46.
Saturday: Showers with intermittent rain and a high of 49. Winds will come from the east-northeast at 10-13 mph.
Saturday night: Overcast with showers and a low of 40. Winds will come from the north-northeast at 6-9 mph.
Sunday: Isolated showers by 10 a.m. with partly sunny skies by the mid-afternoon. We will see a high of 53.
Sunday night: Partly cloudy with a low of 41.
Monday: Mostly sunny with a high of 58.
Monday night: Partly cloudy with a low of 43.

Extended Forecast:
Tuesday: Mostly sunny in the morning, with partly sunny skies by the late afternoon. Highs 49-52, lows 39-42.
Wednesday: Overcast skies with showers/light rain by the late morning. Highs 49-52, lows 41-44.
Thursday: Moderate rain by the morning, with possible thunderstorms in the afternoon. Highs 54-57, lows 46-49.
Friday: Showers/light rain. Highs 57-60, lows 46-49

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