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Boston Weather: 39.0°F | A Few Clouds and Breezy

Weather: Some Snow on the Way

By Roberto Rondonelli
STAFF METEOROLOGIST -- An upper level “jet streak” or patch of maximum wind speed is moving along the main upper level flow centered right north of Massachusetts. Right now we find ourselves in the jet streak exit and according to the ageostrophic balance rule of thumb we expect to transition from upper level convergence to upper level divergence. This in turn means that ascending motion (one of the two main ingredients of precipitation) will begin to influence our area.

Then not surprisingly, a weak low pressure is expected to pass over the southern New England area. The storm will leave Boston in the margin of the precipitation area and there is a chance of 2 or less inches of snow accumulation. A stronger system will move towards Southern New England Wedenesday night to Thursday, bringing snow during Thursday morning changing into ice and sleet during the afternoon. After that some sunshine and relatively warm temperatures are expected again for Friday.

Extended Forecast:

Today: Cloudy, snow or sleet likely. High 38°F (3°C)

Tonight: Mostly cloudy. Low 23°F (-5°)

Thursday: Snow showers temperatures in the 20s during the morning, warming during the late afternoon. High 34°F (1°C)

Friday: Partly cloudy and much warmer. Low 32°F (0°C) High 43°F (6°C)