[Weather] [2019.12.09 PM] NWS Boston EM Briefing: Accumulating Snow Hazards Thru Wed

[BOX Operations - NOAA Service Account]

All,

Here is our latest thinking regarding *accumulating snow potential* Tuesday
night into Wednesday.

*What ...* accumulating snow, potential snow covered roads impacting the
Wednesday morning commute

*Where ..*. risk for accumulating snow is for all of Massachusetts, Rhode
Island into northern Connecticut

*When ..*. rain changes to snow Tuesday evening across northwest
Massachusetts with the rain-snow line advancing southward Tuesday night
across the remainder of Massachusetts, Rhode Island and northern
Connecticut overnight.

*Impacts ...* accumulating snow may result in snow covered roads for the
Wednesday morning commute.  Snow amounts may be enough to shovel and plow
by Wednesday morning.  In addition wet roads Tuesday combined with falling
temps Tuesday night may result in any residual moisture freezing causing
icy spots.

*Forecast Confidence ...* very low as this will likely be a narrow band of
accumulating snow and is difficult at this time range to predict exactly
where the heaviest amounts will occur.  A shift in this snow band as little
as 50 miles could result in most of the snow falling along the south coast
or just offshore, while a 50 mile shift farther inland could result in the
heaviest snow impacting much of MA, RI and CT. It's just too early to say
with any certainty at this time range. However our attached maps
communicate three possible scenarios -

*1) Storm Total Snow* - most likely scenario 1-4" of snow across much of
MA, RI and CT

*2) Snow Amount 10% Percentile* - a 90% chance of at least a coating to an
inch of snow for most of the region

*3) Snow Amount 90% Percentile* - a 10% chance of 6-8" of snow somewhere
across MA/RI/CT

Keep in mind the axis of heaviest snow shown in these images is expected to
change in later forecasts given the event is still 36-48 hours away.

Frank Nocera & Rodney Chai

If you have any questions or would like more information, don't hesitate to
contact us via this email address, on NWSChat <https://nwschat.weather.gov/>,
or at the following:

National Weather Service Boston/Norton, MA
46 Commerce Way
Norton, MA 02766
508.622.3280
Website <http://www.weather.gov/boston> | Facebook
<http://www.facebook.com/NWSBoston> | Twitter
<http://www.twitter.com/NWSBoston>
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