DAYS 1-5 (DECEMBER 3-7)

A chilly pattern and some changing weather in the upcoming several days. High pressure will be in control today through most of Wednesday with dry weather, although today an inversion delivers a blanket of clouds to start the day especially north and west of Boston, which will break up with time. Sunshine will be most dominant from midday through the afternoon hours. One other exception will be Outer Cape Cod which will see more persistent clouds and a few light snow showers due to ocean effect. Wednesday, clouds increase from the west in advance of approaching low pressure, as the high pressure ridge slides off to the east. This system will present itself as a broad low pressure area, the center of which will pass to our north on Thursday. Precipitation arrives Wednesday evening from west to east and blossoms over the region overnight, mainly in the form of rain at the coast and snow over the interior, with some accumulation of snow most likely from about I-95 / I-495 of southeastern NH / northeastern MA westward, as far south as south central MA, especially higher elevations. This tapers off from west to east Thursday morning, with some breaks in the clouds as the first part of the disturbance exits to the east, but a strong cold front will sweep across the region during the afternoon and will likely produce at least scattered convective showers, in the form of snow for most except rain or snow further south of Boston as temperatures will be marginal there. Behind the front, a few additional light snow showers can wander eastward from the hills and mountains to our west and northwest as the coldest air of the season so far flows into the region Thursday night. This air mass will be with us on Friday and Saturday with a blustery northwesterly wind on Friday, easing off somewhat by later in the day. Another disturbance passing through the region Saturday can trigger some snow showers.

TODAY: Sun/cloud mix – most clouds morning and most sun midday on. Chance of snow showers Outer Cape Cod. Highs 36-43. Wind W 5-15 MPH.

TONIGHT: Mostly clear. Lows 18-25. Wind W under 10 MPH.

WEDNESDAY: Sun followed by clouds. Highs 37-44. Wind variable to S up to 10 MPH.

WEDNESDAY NIGHT: Cloudy. Brief light snow inland / rain coast evening. Steadier period of snow inland (coating to 2 inches) / rain coast overnight. Lows 31-38. Wind variable up to 10 MPH evening, S 5-15 MPH overnight.

THURSDAY: Cloudy early morning with rain and snow ending west to east. Sun/cloud mix with passing snow showers (rain or snow showers coast) midday on. Highs 38-45. Wind SW 5-15 MPH, higher gusts, shifting to WNW.

THURSDAY NIGHT: Partly cloudy with a chance of snow showers early, then clearing. Lows 17-24. Wind NW 10-20 MPH. Wind chill as low as 10.

FRIDAY: Mostly sunny. Highs 29-36. Wind NW 10-20 MPH, higher gusts. Wind chill as low as 20.

FRIDAY NIGHT: Mostly clear to partly cloudy. Lows 16-23. Wind NW 5-15 MPH.

SATURDAY: Variably cloudy. Chance of snow showers. Highs 29-36. Wind W 5-15 MPH, higher gusts.

DAYS 6-10 (DECEMBER 8-12)

Dry weather and below normal temperatures to round on the weekend on December 8. Moderating temperatures with fair weather to start December 9 then watching potential / likely impact from low pressure later December 9 and December 10, the track of which will determine precipitation type and other details. Brief drier interlude before next system approaches at end of period in a more active pattern heading toward mid month.

DAYS 11-15 (DECEMBER 13-17)

Another low pressure area threatens some precipitation early in the period, then drier weather returns. Temperatures near to slightly below normal.

DAYS 1-5 (DECEMBER 2-6)

A cold spell marks the first week of December. High pressure sits over the Tennessee Valley and low pressure over eastern Canada. We’ll be in an air flow from the northwest to west. This provides dry weather for the region, the exception being some ocean-effect clouds than can produce a few rain and/or snow showers over the outer portion of Cape Cod today and Tuesday, and perhaps a few locations along the South Coast, most especially Nantucket and Martha’s Vineyard, during Tuesday. Wednesday, the daytime hours will be dry but we’ll see sun give way to clouds ahead of an approaching warm front, parented by low pressure moving east southeastward from Canada into the Great Lakes. This broad but fast moving circulation will take a bit of a left turn and pass to our north Wednesday night and Thursday. Its warm front will produce a swath of light precipitation across our region Wednesday night and early Thursday morning, bringing some light snowfall accumulation to inland areas. Closer to the coast, where it’ll be a little milder, look for more inconsequential wet snow or mixed precipitation transitioning to rain before ending with the front’s passage. The air behind the “warm front” won’t be particularly warm – just a bit milder than the 3 days that precede it. But the cold front that trails from the passing low pressure area will sweep across the region Thursday evening, bringing the shot at a snow shower or snow squall, except snow and/or rain showers in the milder environment from Boston southward. This front will usher in noticeably colder air for Friday, and along with wind it’ll feel more like mid winter than late autumn.

TODAY: Sunshine except some clouds and a chance of a few passing rain and/or snow showers Outer Cape Cod. Highs 35-42. Wind NW 5-15 MPH, higher gusts.

TONIGHT: Partly cloudy Cape Cod. Mostly clear elsewhere. Lows 20-27. Wind WNW 5-15 MPH.

TUESDAY: Partly cloudy with a passing rain or snow shower possible Cape Cod / Islands. Mostly sunny elsewhere. Highs 36-43. Wind W 5-15 MPH.

TUESDAY NIGHT: Mostly clear. Lows 18-25. Wind W under 10 MPH.

WEDNESDAY: Sun followed by clouds. Highs 37-44. Wind variable to S up to 10 MPH.

WEDNESDAY NIGHT: Cloudy. A period of snow inland with minor accumulation, snow/mix to mix/rain coast with little or no snow accumulation. Lows 31-38 evening, may rise slightly overnight. Wind S up to 10 MPH.

THURSDAY: Cloudy early with a chance of snow/mix inland, rain coast, then a sun/cloud mix with a chance of a late day snow shower inland and rain or snow shower coast. Highs 38-45. Wind SW 5-15 MPH, higher gusts.

THURSDAY NIGHT: Partly cloudy with a chance of snow showers early, then clearing. Lows 17-24. Wind NW 10-20 MPH. Wind chill as low as 10.

FRIDAY: Mostly sunny. Highs 29-36. Wind NW 10-20 MPH, higher gusts. Wind chill as low as 20.

DAYS 6-10 (DECEMBER 7-11)

A fast-moving disturbance brings a snow shower chance later December 7 to early December 8 with below normal temperatures over the weekend. Moderating temperatures early next week including a rain/mix/snow threat late December 9 to early December 10 – doesn’t look like a big storm at this point, but have to watch several areas of moisture and energy before a higher confidence outlook can be made for that system.

DAYS 11-15 (DECEMBER 12-16)

Another low pressure area threatens some precipitation early to mid period, then drier weather. Temperatures near to slightly above normal.

DAYS 1-5 (DECEMBER 1-5)

A colder westerly flow dominates our weather during the next few days. Today, clouds will tend to increase from 3 sources: 1) South Coast region ocean-effect clouds. 2) Fair-weather cumulus that develop over land areas. 3) High to mid level clouds from a disturbance passing south of the area. Sunshine will be more dominant Monday and Tuesday across the region. Wednesday, clouds return from west to east ahead of an approaching “clipper” type low pressure area that traverses the Great Lakes region then moves north of our area. This system can produce a period of snow (rain or snow coast) later Wednesday with some minor snow accumulation possible where it snows long enough. A few snow showers can linger into Thursday as the system departs and a new surge of cold air arrives from Canada.

TODAY: Partly sunny. Highs 37-44. Wind NW 5-15 MPH, higher gusts.

TONIGHT: Partly cloudy. Lows 21-28. Wind NW 5-15 MPH.

MONDAY: Mostly sunny. Highs 36-43. Wind NW 5-15 MPH.

MONDAY NIGHT: Mostly clear. Lows 21-28. Wind WNW up to 10 MPH.

TUESDAY: Mostly sunny. Highs 37-44. Wind W up to 10 MPH.

TUESDAY NIGHT: Mostly clear. Lows 21-28. Wind W under 10 MPH.

WEDNESDAY: Clouding up. Chance of snow (except rain or snow coastal areas) late-day or nighttime. Highs 37-44. Wind variable up to 10 MPH.

WEDNESDAY NIGHT: Cloudy. A period of snow except rain or snow coast. Lows 30-37. Wind variable 5-15 MPH.

THURSDAY: Variably cloudy. Chance of a snow shower. Highs 35-42. Wind W to NW 10-20 MPH, higher gusts.

DAYS 6-10 (DECEMBER 6-10)

Cold but diminishing wind December 6 with dry weather expected as high pressure moves closer. A weak and fast-moving disturbance brings a chance of snow showers December 7. Dry weather follows this but a shift to a more southwesterly flow may allow low pressure with more substantial moisture to arrive by the end of the period with a precipitation threat.

DAYS 11-15 (DECEMBER 11-15)

Another low pressure area threatens some precipitation about mid period, otherwise mostly dry start and end of period with variable temperatures but no extremes indicates.