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Boston Weather: 37.0°F | A Few Clouds

Weather: Thankgiving Holiday To Bring Light Rain over Northeast

By Bill Ramstrom and Greg Lawson
Staff Meteorologists

A ridge of high pressure over the center of the country will move westward and weaken as it is squeezed by the two lows to either side of it. Upstream from the ridge, to its west, there is a very deep surface low; downstream there is another sizable low, responsible for the winds and the current cooling trend here. The downstream low is going to give way to the high center here on the east coast this afternoon bringing us slightly cooler temperatures and clearer skies. The high will linger as it weakens until finally on Thanksgiving it gives way to the upstream low.

The upstream low is currently carrying a good deal of moisture from its arrival over the Pacific, but most will be "wrung-out" as it attempts to pass over the Rockies. What does make it over will remain a small, coherent, relatively dry storm and track across the U.S.-Canada border towards the Great Lakes in the classical "Alberta Clipper" fashion. That is it will remain quite strong in its pressure signal yet offer no real threat in precipitation because its moisture will already have been drained and it will be too far north to feed off the moisture of the Gulf of Mexico. Still, all told, the northeast will still probably have light rain on Thanksgiving thanks to this storm. This low will be followed by yet another high and then another low. Luckily, these waves will be in phase so that most of the country will have mostly clear skies on Wednesday, the busiest travel day of the year.

Tuesday:Strong wind shifting from southwesterly to northwesterly. Mostly sunny skies. High 55F (13C).

Tuesday Night: Cool and clear. Low near freezing.

Wednesday: Mostly sunny. Winds weakening. High 48F (9C).

Thanksgiving Outlook: Light rain likely. High in the upper 40s (7-9C).