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December 14th - Snow showers or Plowable snow?


Sey-Mour Snow
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Area Forecast Discussion
National Weather Service Boston/Norton MA
620 AM EST Sun Dec 14 2025

.SYNOPSIS...

Fast moving low pressure will bring accumulating snow to the
region into midday especially south of the Massachusetts
turnpike. The snow will linger into the afternoon across Rhode
Island and especially across far eastern Massachusetts where it
may persist into this evening. A brief shot of arctic
air follows tonight into Monday, with wind chill values
dropping to between 0 to 10 below zero. Cold weather continues
Monday night into Tuesday but with much lighter winds. A warming
trend begins Wednesday and especially by Thursday when high
temperatures of 50+ are possible. Unseasonably mild temperatures
will be accompanied by a round of showers sometime later
Thursday into early Friday with perhaps a period of strong
southerly winds and heavy rain. A brief shot of much colder
weather with another period of strong winds possible later
Friday into Saturday.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...

Key Messages...

* Accumulating snow ends by lunchtime across western MA/CT, but
  persists into the afternoon especially across eastern MA

* Hourly snowfall rates generally on the lighter side...but
  brief bursts of moderate snow possible near the south coast

Trend in high res guidance has been to shift the timing of the end
of the steadiest snow from mid morning to the afternoon for much of
Rhode Island and Eastern Massachusetts. Model guidance, namely the
HRRR and NAM3km have also begun to resolve an inverted trough and
wrap around ocean effect snow extending from low pressure as it
pulls away. Trough will be a good focus for vertical motion and
moisture as omega increases to -10 to -15 ubar/sec. Sharply colder
air filtering behind departing low pressure will introduce non-zero
MLCAPE values which could help with ocean enhancement of any
snowbands. Despite these favorable parameters, daytime will likely
be limited by marginal sfc temps in the mid and even upper 30s.
Temps may be locally lower under any ocean effect bands but its
really going to take considerable rates to cool the PBL from the
influence of 45-47F water temps. As a result, still think that
advisory level snow totals 2-4" for RI/SE MA with localized 5-6"
amounts possible near the south coast and Cape Cod.

 

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Nice band setting up HVN east along the shoreline and up 395.

Radar shows a couple of bands of relatively heavier snow. One has remained centered offshore, but appears that it could shift into at least eastern Long Island, and possibly get into Nassau County and NYC as well before all is said and done. Another somewhat  weaker band is heading into NE NJ and probably impact parts of the Lower Hudson Vally into SW CT - could clip NYC as well. Subsidence noted in between the 2 bands, and hi-res CAMs favor the offshore band being maintained, owing to its proximity to stronger frontogenetic forcing

1000006716_50.jpg

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4 minutes ago, BrianW said:

Nice band setting up HVN east along the shoreline and up 395.

Radar shows a couple of bands of relatively heavier snow. One has remained centered offshore, but appears that it could shift into at least eastern Long Island, and possibly get into Nassau County and NYC as well before all is said and done. Another somewhat  weaker band is heading into NE NJ and probably impact parts of the Lower Hudson Vally into SW CT - could clip NYC as well. Subsidence noted in between the 2 bands, and hi-res CAMs favor the offshore band being maintained, owing to its proximity to stronger frontogenetic forcing

1000006716_50.jpg

how much in branford so far?

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