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Boston Weather: 49.0°F | Overcast

Weather: Models Tease...

By Marek Zebrowski
Staff Meteorologist

The weather patterns are about to change: A ridge of high pressure will develop over the West, giving respite to the mud-weary Californians. In turn, the East Coast - spared of snow so far this season - will be under the spell of colder and stormier weather as a broad trough begins to dominate the flow over the Northeast.

Before this pattern gets firmly established, models have difficulty in solving smaller-scale events. There is no doubt that Wednesday will be dominated by a cold airmass, pushing in behind a rapidly intensifying storm over Labrador. But by Thursday morning, as this high slowly drifts over the north-central New England, a low pressure will be getting organized just off the Carolina Capes. Should this storm system develop quickly and without much deepening, it will likely pass just far enough offshore to spare major metropolitan areas of the Atlantic seaboard a moderate-sized snowstorm later on Thursday. With some delay in coastal development down south, a different scenario is likely: A cold high pressure positioned over the Canadian Maritimes may force the southern storm to come much closer to shore than currently anticipated.

In any case, by later Friday another frigid airmass will slip down from Canada, ensuring us a mostly sunny and very cold weekend. In the longer-range outlook, an Alberta clipper flyby is in the cards for late Sunday, with more wintry fluff on offer.

Today: Mostly sunny, windy and cold. High only near 28F (-2C).

Tonight: Clear and very cold with diminishing winds. Low 12F (-11C) in town but single digits (-16 to -13C) outside the metropolitan area.

Thursday: Some sun early, then steadily increasing clouds. Cold and raw with winds turning onshore. Ocean effect flurries and light snow on the Cape and from Boston southward. High 25F (-4C).

Thursday night: Light snow likely. Cold with moderate northeasterly winds. Low 15F (-9C).

Friday and Saturday outlook: Friday snow tapering off early. Clearing and becoming mostly sunny and cold with highs only in low to mid 20s (-6 to -3C) and lows in teens (-12 to -10C) around town, single digits (-17 to -13C) elsewhere.