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Boston Weather: 39.0°F | Mostly Cloudy

Weather - Free Fall

Free Fall

By Gerard Roe
Staff meteorologist

The weather over the next few days will be dominated by a plunge southward of a large pool of cold air. This excursion is associated with a large scale amplification of the jet stream pattern. This has resulted in a strong cold front swinging through the midwest on its way here. Temperatures across the front differ by as much as 25F (14C). The northern midwest will see its first snows of the year, and Thursday night will bring the chance of frost in some parts of Massachusetts.

Wednesday will see a gradual clouding up due to overrunning warm air in advance of the front. There is a likelihood of rain late Wednesday and early Thursday morning ahead of the front, which will pass by sometime in the late morning. Temperatures will then drop rapidly accompanied by a shift in the winds to northerly.

Today: Fair. Partly sunny early then increasing high clouds. Winds moderate from the South and becoming stronger as the day progresses. High 70F (21C).

Tonight: Cloudy, with light rain likely after midnight. Low 56F (13C).

Thursday: Any drizzle clearing during the morning. Much cooler, clearer after frontal passage. Late morning high of 60F (16C). Low 36F (2C).

Friday: Clear and cool. High in the mid 50s (13C). Low 35 (1C).