Boston, MA

Coastal Storm Moves to Boston this Afternoon; Low-Pressure System Might Bring Snow, Forecasters Say

Bryan Dijkhuizen

A coastal storm is moving offshore this morning, and a cold front is expected to arrive this afternoon. Conditions get drier, windy, and colder overnight and into Thursday morning.

A weak low-pressure system heading south of New England might bring light snow to the region late Thursday night into the early morning hours of Friday.

Another storm system is expected to deliver rain and snow to the area on Christmas Eve night and into Christmas Day, but the specifics of the storm system are still up in the air. For the first part of the week ahead, more unstable weather is expected to return after a bit of break.

Early this morning, areas of rain and freezing rain moved north over Connecticut and into interior northern and western Massachusetts, but mainly dry weather prevailed in Southeast New England.

A low-level frontogenesis region is causing rain at 925 Mb near the snout of a weak low-level jet, which is forcing the precipitation.

As shallow cold air maintains surface temperatures at or below freezing, pockets of freezing rain will continue over the interior through 12z.

This region of forcing will persist across the interior through 12z. Winter weather advisories are in effect for the whole state of Massachusetts, including areas west of I-95 and into Hartford county.

Temperatures will begin to climb above freezing from the south to the north about 12-15z, and most sites throughout northern Massachusetts will experience this.

Western and northern Massachusetts will experience a light glaze in most interior sites, with up to 0.10" of ice accumulation in higher terrain in the western and northern parts of the state.

A low-level forcing system will move eastward through eastern New England between 14 and 18z, bringing a spell of rain to Rhode Island and eastern Massachusetts.

Precipitation will be ending across western New England at the same time as the rear edge of the system moves to the east with proper and the wind shifts to the northwest.

It is expected that the last of the rain will leave the Cape and Islands around midday.

Exceptional drying begins this afternoon from the west as PWATs fall below 0.20".

As a result, the skies will gradually clear from west to east during the day. Northwestern winds will also rise behind the front due to the cold advection pattern, with gusts of 20-30 mph emerging in the late afternoon and evening.

Around noon, temperatures may briefly reach the lower 50s throughout the Cape/Islands and Southeast coastal Massachusetts as southerly flow builds ahead of the storm's frontal passage.

Aside from that, high temperatures will range from the upper 30s to the mid-40s over Southern New England.

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