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Boston weather: Back door cold front for Tuesday

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Forecast discussion: Well, the weather models did not help me this weekend, as we remained mostly cloudy throughout Memorial Day. We even had a few periods of showers and light rain. The disturbance over Vermont last night gave us all the clouds and showers during most of the day. For this evening, we will see partly cloudy skies, so any firework displays should go on as scheduled. Despite the clouds, west winds helped skyrocket the temperatures from 68 to 78 degrees in one hour.

As we head into the workweek, we will be seeing some very cold temperatures for the last week of May. This will be due to the return of the back door cold front. A frontal boundary over Quebec will come down from Northern New England. Winds will shift to the northeast, and we will be seeing scattered showers from the mid-morning. The shower activity will not end until Wednesday afternoon, when high pressure from Canada pushes the boundary further south. But, the high will be pushing down colder air as well, as high temperatures on Wednesday will only reach the upper 50’s.

We will be seeing an increase in temperatures on Thursday, as winds shift from the cold east to the warm southwest. But, by Friday, a new cold front will approach the east coast. We will see showers arrive by the end of the morning commute, and the models are showing heavier precipitation by the evening commute. On Saturday, the low’s center will move offshore, but there is the risk of another round of showers on the back side of the low. Scattered showers will remain around the region until early Sunday morning. We will see improving skies by the afternoon.

We will end the forecast period by looking ahead to next Monday. We will still have enough moisture in the air to keep skies with more clouds than sun. Also, a weak upper level ridge will slowly try to build over New England by the middle of next week. High temperatures will still only reach the upper 60’s.

72 hour forecast:

Tonight: Partly cloudy with a low of 63.
Tuesday: Mostly cloudy with showers arriving by 11 a.m. We will see a high of 68 with temperatures falling through the day. Winds will shift to the east-northeast at 9-12 mph.
Tuesday night: Light rain tapering to showers and patchy fog by 1 a.m. with a low of 48. Winds will come from the northeast at 9-12 mph.
Wednesday: Showers end by noon with partly sunny skies by the late afternoon. We will have a very cold high of 57.
Wednesday night: Partly cloudy and much cooler with a low of 48.
Thursday: Mostly sunny and slightly warmer with a high of 66.
Thursday night: Partly to mostly cloudy with a low of 53.

Extended Forecast:
Friday: Overcast with showers arriving by 9 a.m. Precipitation becomes heavier in the evening. Highs 65-68, lows 52-55.
Saturday: Showers end by 2 a.m. with another round of showers by the early afternoon. Highs 64-67, lows 52-55.
Sunday: Showers end by 5 a.m. Mostly sunny skies by 11 a.m. Highs 66-69, lows 52-55.
Monday: Partly sunny. Highs 68-71, lows 55-58.

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