The average date of the first frost in Boston is November 7th…it happened this morning…Boston slipped to 32 degrees at 6:04 AM. Some towns were in the teens at sunrise…Norwood 18 and Taunton 19! Tonight won’t be as bad as last night, we have pretty good cooling conditions right now and we will dip into 30s before temps level out as clouds arrive overnight.
Clouds will thicken up early tomorrow morning and rain will press in by late morning getting heavier in the afternoon when some downpours arrive. The overrunning rain will taper off tomorrow evening but the amplifying trough to our west will spin up another low in our offshore waters throwing more rain back into the area later tomorrow night through midday Friday. When it is said and done we are looking at 1-2 inches with higher amounts possible over SE Mass closer to possible convective elements.
The upper level cut-off remains to our west until it passes overhead on Sunday it will spin up additional lows offshore that appear to be a little too far out…but should be closely monitored. With the location of the upper level low to our west the more serious cold air will be delayed…arriving on Sunday. A mid level ridge will try to establish itself next week providing a warm up which is much more pronounced on the EURO. The GFS actually intensifies another low in the Maritimes keeping us under cyclonic flow early next week…coolish and somewhat cloudy. This is the first run with this scenario and we prefer the EURO in the extended regardless so we will side on the warmer solution.