[Weather] [2019.12.27 PM] NWS Boston EM Briefing: Wintry weather with possible ice event Sunday night and Monday

[BOX Operations - NOAA Service Account]

Hi everyone,

We wanted to give you a heads-up about a storm that will be impacting our
region Sunday night and continuing into Monday night.  This will be a
complicated storm with a mix of precipitation types across southern New
England.

*Main Weather Concerns:  *

1) *Possible ice storm* in the higher terrain of western MA (eastern slopes
of the Berkshires) and central MA (Worcester County hills).  Freezing rain
is expected to begin in those areas Sunday evening and continue into Monday
evening, with temperatures around 30 degrees.  Cannot rule out some
freezing rain in northern CT as well.  There is uncertainty at this time as
to amounts, but current projections are for between 0.25 and 0.50 inches of
ice accretion in the slopes of the Berkshires and Worcester hills. There is
some potential for greater than 0.50 inches. A Watch may be needed in
subsequent forecast issuances.

2) *Mixed bag of snow, sleet, freezing rain, and rain during the morning
commute on Monday. * Any snow on the front end in northeast MA is expected
to be short-lived and turning over to sleet and rain Sunday night into
Monday.  The worst conditions are expected to be outside of the I-495
corridor.  On Monday, mainly rain is expected in the CT River valley,
northern CT, RI, and eastern MA.

*Confidence...and what could still change:*

We have high confidence that this storm system will occur and produce a
wintry mix, but still low to moderate confidence on amounts and
distribution of precipitation types.  A colder scenario than currently
forecast would mean less freezing rain and possibly significantly more
sleet and/or snow in northeastern MA.  The potential exists for higher
freezing rain totals in the high terrain of western and central MA, which,
if true, could lead to power outages and downed trees/wires.

Stay tuned for the latest information.

-- Glenn Field
   Warning Coordination Meteorologist
   NWS - Boston/Norton, MA

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
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