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Boston Weather: 40.0°F | Fair

Weather: Jet Stream Blues


Jet Stream Blues

By Gerard Roe
Staff Meteorologist

The large pool of frigid polar air that has left us with temperatures about 10F (5C) below normal now sits squarely over the eastern part of the country. Consistent with this, the jet stream is aligned almost parallel with the east coast, and gentle on-shore breezes at lower altitudes bring moist air from the ocean. Such a configuration is always a warning sign for bad weather. Waves travelling along the jet stream causing lifting of the air usually generate precipitation in the moist environment, and this week is not an exception.

The particular ripple which is going to make today miserable will spread rain in from the Berkshires through the early morning. Rain will be moderate with around half an inch or even more accumulating by day's end, diminishing towards the evening. The associated development of a surface low just off the coast will turn winds round to westerly by nightfall. The outlook continues to be unsettled with a strong likelihood of rain tomorrow afternoon. In the longer term, some respite can be expected from the clouds, although not from the cold temperatures, as high pressure develops and moves east from the central states.

Today: Rainy and cloudy. Fog possible in the morning. Winds light from the east becoming westerly later. Rain peaking during the day. High 63F (17C).

Tonight: Cloudy and continued chance of rain. Low 53F (12C).

Tomorrow: Mostly cloudy. Chance of rain afternoon. High 66F (18C). Low 52F (12C)

Thursday: Clearing and fair. High around 65F (18C).