DAYS 1-5 (NOVEMBER 27 – DECEMBER 1)
As anticipated, snowflakes fell in a good portion of the WHW forecast area last evening, resulting in anything from just flakes in the air with no accumulation from Boston southward to a light coating in nearby suburbs to up to around 1 or 2 inches, even a few 3 inch amounts, in the outlying higher elevation locations. The low pressure area responsible for it formed on a passing cold front and intensified rapidly, pulling a lobe of moisture around its back side as the cold air was getting established, resulting in the snowfall for the region. If you had a barometer and looked at it, or looked up area pressures, you’d have seen that it fell pretty sharply yesterday late afternoon and evening, in response to the formation and rapid strengthening of the low pressure area. But now that low has exited and is moving away via the Canadian maritime provinces. We’ll be in the tight pressure gradient between it and high pressure approaching from the west today, so we’ll have blustery and cold weather, starting with a lot of clouds that will eventually give way to sun. The cold wind will continue tonight but ease up Sunday as high pressure builds across the region, and while it will be a cold day it won’t feel nearly as biting as today will. We’re in a pattern of quick-moving systems, and we’ll turn our attention to a clipper low pressure area moving through the Great Lakes and heading for NY State Sunday night into Monday, spawning a weak secondary low just south of New England that will then move right across the Cape Cod area early Monday. This system will bring a swath of precipitation to the region that is on the light side and not long-lasting. It’ll fall as mostly snow over interior areas and north of Boston, but mix/rain from Boston southward across the South Shore region and along the South Coast. Although areas that see rain may flip to some snowflakes before the precipitation pulls away by midday Monday, and the rest of the day will feature drier but blustery and chilly weather. High pressure slides across the region Monday night then out of the region on Tuesday as a weakening clipper low moves through the Great Lakes again. This system will already be moisture-starved and losing support so it may bring some clouds to our area Tuesday but that should be it with continued dry, cold conditions. A west northwesterly air flow will likely drive a cold front through the region Wednesday, reinforcing the chilly air to start December.
TODAY: Lots of clouds giving way to more sun. Highs 37-44. Wind NW 10-20 MPH, higher gusts.
TONIGHT: Mostly clear. Lows 18-25. Wind WNW 5-15 MPH.
SUNDAY: Mostly sunny to partly cloudy. Highs 38-45. Wind W up to 10 MPH.
SUNDAY NIGHT: Clouding up. Late evening and overnight light snow chance except mix/rain Boston, South Shore, and South Coast. Snow accumulation of a coating to 1 inch possible mainly over interior areas. Lows 29-36.Wind variable up to 10 MPH.
MONDAY: Cloudy start with a chance of light mix/snow favoring southern and eastern areas, then partly sunny. Highs 38-45. Wind N to NW 5-15 MPH.
MONDAY NIGHT: Partly cloudy. Lows 18-25. Wind NW 5-15 MPH, higher gusts.
TUESDAY: Partly sunny. Highs 37-44. Wind variable up to 10 MPH.
TUESDAY NIGHT: Partly cloudy. Lows 23-30. Wind W up to 10 MPH.
WEDNESDAY: Partly sunny. Chance of a passing snow flurry. Highs 37-44. Wind NW 10-20 MPH.
DAYS 6-10 (DECEMBER 2-6)
While not “stormy” in the way we often think of it, the pattern will be active with a lot of disturbances coming along in a flow that will shift from west northwest to west southwest. A weak low pressure system will likey pass by with little fanfare early in the period. A low system with a little more moisture available targets a December 4 passage at which time we may briefly warm up to include rain showers, followed by a sharp chill-down and a snow shower possibility as it pulls away.
DAYS 11-15 (DECEMBER 7-11)
A little more west to southwesterly air flow at upper levels and a little more activity in the jet stream results in better precipitation chances during this period. Temperatures variable, near normal overall.