2:47AM
DAYS 1-5 (DECEMBER 10-14)
Active pattern upcoming as the fast-moving Pacific jet stream pattern continues, but now sharing itself with some colder air pressing southward out of Canada, which makes things a little more interesting. After a fair and cold Saturday and most of Sunday, the next plume of Pacific moisture will arrive with a elongated wave of low pressure Sunday night into Monday. The question continues to be where the snow/mix/rain zones will be, and the best call at this point is to go with snow to start in most areas except mix South Coast Sunday night, then the mix/rain area moving northward to at least the Mass Pike area and Boston-Providence corridor during Monday morning, but how fast and to what position will determine how much snow falls. For now will lean to mainly snow for the duration in the I 495 belt north of the Mass Pike with the mix/rain zone getting into the I 95 corridor toward the end of the event, with more rain further southeast. All of this will be out of here by Monday evening in time for an 8:30PM kick off in Foxboro of Monday Night Football between the Patriots and Ravens. Tuesday will be fair and chilly as a small high pressure area crosses the region. Wednesday will bring the next risk of precipitation but at this point it looks as if it may end up being two systems that never really get too involved with each other, one passing south and the other to the north, so while it is still several days off just going with a risk of snow showers for now.
TODAY: Mostly sunny. Highs 27-35. Wind NW 10-20 MPH with higher gusts morning, diminishing afternoon.
TONIGHT: Clear. Lows 9-15 outlying areas, 16-24 elsewhere. Wind light variable.
SUNDAY: Sunshine fading behind increasing clouds. Highs 28-36. Wind light variable.
SUNDAY NIGHT: Thickening overcast. Snow develops overnight except mix South Coast. Lows 22-30. Wind light NE to E.
MONDAY: Overcast. Precipitation morning to early afternoon will be mainly snow I 495 north of the Mass Pike and northwestward from there but may end as brief mix near I 495, snow transitioning to mix and ending as mix and rain I 95 belt mainly Boston to Providence corridor, mix turning to rain immediate coast from Boston south including Cape Cod. Preliminary snow accumulation estimate: coating to 1 inch coastline and Cape Cod, 1-3 inches Boston to Providence corridor, 3-6 inches I 495 belt mainly north of the Mass Pike and northwestward from there. Highs 33-43, mildest Cape Cod. Wind variable 5-15 MPH.
TUESDAY: Partly cloudy. Lows 22-30. Highs 32-40.
WEDNESDAY: Variably cloudy. Risk of snow showers. Lows 20-28. Highs 32-40.
DAYS 6-10 (DECEMBER 15-19)
Confidence remains lower than average overall but am pretty sure of a blast of cold air early in the period and a storm threat around the weekend of December 17-18.
DAYS 11-15 (DECEMBER 20-24)
Another storm threat may occur about the middle of the period but again highly subject to change based on the fast-flowing pattern and medium range guidance difficulty in the solution of possible systems.