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Boston weather: Early showers, before becoming mostly sunny

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Forecast discussion: A weak high pressure ridge kept sunshine over Boston most of Friday. Although there was the chance for some isolated showers, the mostly sunny skies allowed temperatures inland to skyrocket. At Logan Airport, the high for the day was unofficially 68 degrees. Unless you were along the Cape, temperatures were about 10 degrees cooler, as winds came off of the ocean.

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As we move into the overnight, a frontal boundary will bring scattered showers across eastern Massachusetts. The showers will be brief, and ending by the early morning. We will see high pressure build back over the state by Saturday afternoon. This will allow for mostly sunny skies with temperatures in the middle 60’s. It will be a little warmer on Sunday, with highs in the upper 60’s. Overnight lows Sunday night will stay above 50 degrees. It will remain warm on Monday, as some areas will reach the lower 70’s.

By Monday night, the weather will change, and we will see a drastic change in our temperatures by the middle of the week. A low pressure system forming over the Central U.S. will slowly work its way into New England early Tuesday morning. Colder air behind the cold front associated with this low will meet with the rather warm air. This will create some heavy rainfall on Tuesday, with the chance of some thunderstorms. As the low pressure system moves offshore, the precipitation will taper to showers Tuesday night, before ending early Wednesday morning. But, the high temperatures for the day will be the same as our low temperatures for this weekend.

The high will bring some intense cold air for this time of the year over New England. High temperatures will only be in the lower 50’s, and overnight lows could fall to near freezing. As we move towards the end of the week, a low pressure system forming off the coast of North Carolina could bring some showers up into Southern New England by Friday night. As of now, the American and United Kingdom models keep us dry, but the European models brings precipitation as early as Friday afternoon. For now, I will stay with the American model, as it has been more consistent the last two models runs. However, my confidence in the forecast after Thursday is low, due to the differences in the models.

72 hour forecast:

Tonight: Cloudy with scattered showers. Showers may end before dawn. We will see a low of 48.
Saturday: Isolated showers until the early morning, with mostly sunny skies by the late morning. We will see a high of 65 with winds turning to the south-southwest at 12-15 mph in the afternoon.
Saturday night: Partly cloudy with a low of 47. Winds will come from the south-southwest at 8-11 mph.
Sunday: Mostly sunny with a high of 67.
Sunday night: Partly cloudy with a low of 51.
Monday: Mostly sunny and breezy with some fair weather clouds by the afternoon. It will become quite warm, as I am expecting a high of 73.
Monday night: Cloudy skies with showers developing after midnight and a low of 54.

Extended Forecast:
Tuesday: Rain becoming heavier through the day, tapering to showers in the evening. Highs 61-64, lows 38-41.
Wednesday: Showers end after midnight, with partly cloudy skies. It will become colder. Highs 48-51, lows 34-37.
Thursday: Mostly sunny. Highs 49-52, lows 34-37.
Friday: Partly sunny with possible showers by the evening. Highs 50-53, lows 37-40.

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