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Boston weather: A wet morning, but sunny afternoon for Saturday

Forecast discussion: After giving heavy rainfall and flooding to Maryland and North Carolina, a slow moving cold front is waiting to give us some heavy rainfall Friday evening. We have seen occasional downpours in between drizzle during the day. Radar imagery shows a heavy band of precipitation now moving into Long Island. We may also see some isolated thunderstorms, gusty winds, and lightning. There is the chance for some minor street and river flooding. But, the heavy rain will end by Saturday morning.

The front will move offshore by the before the beginning of the afternoon. As we move through the afternoon, we will see increasing sunshine. We will also see our high temperature for the much later in the day. Skies will become partly cloudy by Saturday night, but clouds will return for Sunday, giving us partial sunshine. However, keep an eye to the skies, as there is the small chance for a passing shower or thunderstorm.

As we head into early next week, an upper level low will get blocked from moving to the east. This low will allow colder air to come down from Canada, and remain over New England. A series of weak low pressure systems will rotate in a circular pattern. The lows may create a passing shower by Monday afternoon. By Tuesday, the upper level low moves slightly offshore. This will allow us to have dry weather, but cooler temperatures.

A low pressure system coming from the Midwest will move over Southern New England by Wednesday, giving us showers by the middle of the morning. The models show heavier rainfall during the overnight, with the precipitation tapering to showers by Thursday morning. Some warmer air will filter in, allowing our temperatures to reach near 70 degrees. A secondary low will remain over the region on Friday, producing more showers.

72 hour forecast:

Tonight: Heavy rain with areas of patchy fog. Isolated thunderstorms are possible, with some gusty winds and lightning. We will see a low of 61.
Saturday: Heavy rain and thunderstorms will end by 7 a.m. and showers end by 10 a.m. We will see partly sunny skies during the afternoon. We will see a high of 73 with west-southwest winds of 14-17 mph.
Fenway Park Forecast (7:10 p.m. vs. Detroit): Partly cloudy, 66.
Saturday night: Partly cloudy skies with a low of 53. Winds will come from the northwest at 7-10 mph.
Sunday: Partly sunny with a widely isolated shower or thunderstorm after 3 p.m. We will see a high of 69.
Sunday night: Mostly cloudy with a low of 51.
Monday: Partly sunny with a widely isolated afternoon shower and a high of 65.
Monday night: Mostly cloudy with a low of 50.

Extended Forecast:
Tuesday: Partly to mostly sunny. Highs 64-67, lows 49-52.
Wednesday: Mostly cloudy with showers by mid-morning. Highs 64-67, lows 49-52.
Thursday: Moderate rain in the early morning, with showers by mid-morning. Highs 65-68, lows 52-55.
Friday: Mostly cloudy with scattered showers. Highs 63-66, lows 53-56.

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