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Boston weather: Precipitation by Saturday night?

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Forecast discussion: A strong high pressure system over central Pennsylvania helped to bring picture perfect weather to Boston on Friday. Thanks to winds coming off the ocean, the humidity levels remained quite low. However, we will begin to feel the humidity return over the weekend.

As we head into Saturday, the daytime will be just fine, although we will begin to change over to southwest winds. In fact, the winds will become quite windy by the afternoon. A warm front will be making its way towards New England tomorrow night. We may see an isolated shower or two before sunset. Otherwise, the front will help create scattered showers and thunderstorms around midnight.

As we head into Sunday, we will see some hit and miss showers and thunderstorms. Also, during the mid-morning hours, we may see a lull in the precipitation. A second low pressure system will form along the front, and help bring create another round of showers and thunderstorms by the late afternoon.

The cold front will begin to make its way into the region on Monday, which will continue to bring scattered showers and thunderstorms. The cold front will linger into early Tuesday morning, before it moves offshore. There is the chance we may see some isolated showers into the morning hours, as the American model does not clear us out as quickly as the European model. We will see some partial sunshine during the afternoon.

High pressure will fully take over our weather by Tuesday night, as we will see partly cloudy skies. The sun will return for Wednesday and Thursday, although temperatures will remain in the lower 80’s. A deep long wave trough in the upper levels will remain near the eastern U.S., keeping our temperatures right at seasonable.

On Friday, a weak disturbance will form off the Mid-Atlantic coastline. It will remain disorganized, but it will move towards New England. The disturbance will remain offshore, but it will bring the threat of some showers to the area by Friday afternoon. Right now, I feel the chance for showers is slim, as the European model keeps New England completely dry.

72 hour forecast:

Tonight: Partly cloudy with a low of 65.
Saturday: Mostly sunny in the morning, with increasing clouds and humidity by the mid-afternoon. An isolated shower or thunderstorm is possible by the early evening. We will see with a high of 85 with winds increasing from the south-southwest to 16-21 mph by the afternoon.
Saturday night: Mostly cloudy with isolated showers and thunderstorms by 9 p.m. We will see a low of 68 with south-southwest winds of 10-13 mph.
Sunday: Cloudy with scattered showers and thunderstorms with a high of 81.
Sunday night: Scattered showers and thunderstorms. We will have a low of 71.
Monday: Scattered showers/thunderstorms with a high of 81.
Monday night: Scattered showers/thunderstorms. We will see a low of 68.

Extended Forecast:
Tuesday: Showers end by 3 a.m. with partly sunny skies by mid-morning. Highs 76-79, lows 61-64.
Wednesday: Mostly sunny. Highs 78-81, lows 61-64.
Thursday: Partly sunny. Highs 79-82, lows 65-68.
Friday: Partly sunny with possible showers. Highs 80-83, lows 64-67.

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