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Boston Weather: 42.0°F | Fair

Weather: Sights on September Solace

By Greg Lawson
STAFF METEOROLOGIST

We have high pressure to thank for yesterday's wonderful weather and can look forward to similar splendor for the latter half of the upcoming holiday weekend; however, we have to pay the piper with some unsettled skies beforehand. Our friendly high pressure system is slipping out to sea as a trough, with its concomitant surface low and cold front, ruch eastward to fill its place. Air circulates clockwise around a high pressure center, and this means we'll see the winds here in Boston shift to southerly (i.e. from the south) as the high passes out to sea. Winds from the south will bring us warmer air and moister air. These two properties will collude to bring convective instability to the region. The passage of the cold front Friday afternoon may be enough to set-off showers or even thunderstorms. It is difficult to say whether or not it will rain---I will offer that the conditions will be conducive to supporting rain, and I predict that it is more likely we'll see rain than not, perhaps a 60 percent chance of precipitation. In any case, Friday will certainly be cloudy and rather humid.

It will take a little time on Saturday for the remnants of the front to pass to sea, but beginning Saturday afternoon or perhaps evening, another high pressure system will build into the area providing us with what poses to be a clear, wonderful late summer weekend. Labor Day looks like a perfect day for avoiding labor. The trend should continue to mid-week.

Extended Forecast

Today: Very pleasant. Mostly sunny with light winds shifting to southerly. High 75°F (24°C).

Tonight: Not so bad. Cloudiness developing. Low 63°F (17°C).

Friday: Unsettled. Patchy cloudiness. 60 percent chance of late afternoon showers or thunderstorms. Muggy. Cloudy through the night. High 80°F (27°C). Low 66°F (19°C).

Saturday: Gateway to Splendor. Cloudiness and humidity give way to mostly clear skies. Winds shifting back northerly. High in the mid to upper 70s (24-26 °C). Low in the upper 50s (14-16 °C).

Sunday and beyond: Cooler temps with mostly clear skies. Crisp and beautiful! Highs in the low to mid 70s (22-25 °C) and lows in the 50s (11 - 15 °C).