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Boston weather: More clouds on Thursday

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Forecast discussion: In Boston, you did not have to be a meteorologist to figure out the weather pattern. The last few days have always started out with bright sunshine, with clouds building. By the afternoon, the clouds would take over the skies, with some passing showers. However, on Wednesday, high pressure off the Delmarva Peninsula actually gave us more sunshine through the afternoon. However, high clouds began to form by the late afternoon.

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The high will influence our weather this evening, although we will begin to lose the stars behind overcast skies. A warm front in the middle of the country has been slowly moving northward. The front will actually become stalled on Thursday, as there is still some cold air in the upper levels of the atmosphere over the Northeast U.S. Some moisture will make its way over Southern New England, creating a widely isolated shower. Any shower activity will end by the early evening, and we will remain cloudy Thursday night.

As we move into Friday, the warm front will continue to push northward. However, the front will stall as it tries to move over the Appalachian Mountains. We will see slightly more scattered showers by Friday afternoon, and continue into the evening. The warm front will push through into Southern New England by early Saturday morning, and we will see more widespread showers. With the warmer temperatures expected on Saturday, some isolated thunderstorms are possible.

As we move into Saturday night, the cold front associated with the low will pass through, eventually taking the entire system with it. Showers should end by mid-morning on Sunday, so I am not expecting any afternoon plans for our mothers to be canceled. A weak high pressure ridge will give us some dry weather into Monday afternoon.

Another storm system will bring some scattered showers by Monday afternoon, along a warm front. The front will pass to our north Monday night, so any shower activity will end before midnight. The cold front will slowly move into the Northeast U.S. by Tuesday night. I am expecting some heavier rainfall from the cold front from Tuesday afternoon into Tuesday night. Thanks to the warm front, high temperatures are expected to be in the 70’s into Monday. The temperatures will be cooler by Wednesday, after the cold front passes, and winds shift to the northwest.

72 hour forecast:

Tonight: Partly to mostly cloudy with a low of 48.
Thursday: Partly sunny by the late morning, with isolated showers starting at noon. We will have a high near 65 with west-southwest winds shifting to the east-southeast at 8-11 mph by the late afternoon.
Thursday night: Cloudy with a low of 49. Winds will shift to the east-northeast at 3-6 mph.
Friday: Cloudy with scattered showers by the afternoon. We will see a high of 63.
Friday night: Mostly cloudy with scattered showers by midnight and a low of 54.
Saturday: Cloudy with widespread showers and a high of 71. A thunderstorm remains possible.
Saturday night: Scattered showers and a low of 60.

Extended Forecast:
Sunday: Showers end by 9 a.m. and becoming partly sunny. Highs 72-75, lows 55-58.
Monday: Partly sunny with scattered showers/light rain by 4 p.m. but ending by midnight. Highs 71-74, lows 54-57.
Tuesday: Cloudy with scattered showers by mid-morning, with widespread showers/light rain by mid-afternoon. Highs 69-72, lows 51-54.
Wednesday: Moderate rain in the morning, tapering to showers by the afternoon. Highs 63-66, lows 51-54.

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