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Boston Weather: 77.0°F | Partly Cloudy

Weather

Changing Patterns

By Marek Zebrowski
STAFF METEOROLOGIST

A combination of a cold northerly flow with the subtropical stream over the northeastern United States will support a development of a surface low that will lift into our area, approaching from southwest during Friday. Residual cold from the coldest morning so far this season will be firmly entrenched in the interior sections and river valleys; thus, when the precipitation begins very late Friday night, it will fall initially as snow and freezing rain everywhere except along the coast.

Following a cold front passage late Saturday, a cold high pressure will slowly crest overhead, and as it moves offshore toward the end of the weekend, our eyes should turn to the south, where a potent storm is forecast to develop off Hatteras by early Tuesday. This low will rapidly intensify as it races along the East Coast and gives us a good chance of a significant winter storm by mid-week.

Today: Clear and cold start with clouds increasing and thickening throughout the afternoon. High 41F (5C). Northerly winds will diminish and ominously veer to northeast.

Tonight: Cloudy with cold rain or wet snow developing after dark. Good chance of snow and freezing mix persisting until daylight Saturday well to the west and north. Low 34F (1C) near the coast with winds becoming southeast.

Saturday: Cloudy with cold rain and showers along the coast, mixed precipitation inland. Highs rising to 44F (7C) along the coast; in the 30s (1-4C) inland. Winds shifting to northwest by evening.

Sunday: Fair and cold with lows in the 20s (-6 to -2C) and highs in mid 30s (2-3C) inland and around 40F (4C) near the coast.