[Weather] [2019.12.16 AM] Winter Weather expected Tonight through Tuesday; Arctic Blast Wed night into Thursday

[BOX Operations - NOAA Service Account]

Good morning.

Expect dry conditions today and tonight across the region. Small Craft
Advisories are in effect today, but will end as winds diminish during the
day.

*Accumulating snow to a Wintry Mix Late Tonight through Tuesday evening*

*Headlines*:  *Winter Weather Advisories are in effect for late Tonight
through Tuesday for areas away from Cape Cod and the islands.*

The next winter weather event is fast approaching.  Low pressure will move
across the mid Atlantic region today, then off the coast tonight. Moisture
from this low will shift northeast, moving into northern Connecticut, most
of Rhode Island and southeastern Massachusetts by around 3 to 4 AM Tuesday,
then spread northward through mid morning across the remainder of the
region.

Will see the snow change to a wintry mix mainly near and south of the Mass
Pike by around 9 AM.  The mix will change to rain along the coastline by
midday, while the mixed precipitation will continue to push further inland
through the afternoon. As low pressure passes across the southern waters,
the wintry mix will change back to snow Tuesday afternoon before tapering
off Tuesday night.

This morning's snowfall and ice accumulation maps are attached, as well as
the forecast onset of the precipitation early Tuesday morning.

Forecasted snowfall of 1 to 3 inches of snow/sleet south of the Mass Pike
into NE CT, RI and SE Mass, while with 3 to 5 inches is forecast as  mainly
snow north of the Pike to near north central CT.  There is a *low risk* for
up to 6 inches near the NH border from N of Fitchburg to Greenfield.
Freezing rain of up to one-tenth inch is expected across RI, northern CT,
and interior MA south of the Mass Pike. A few spots of 0.10 to 0.25 inches
of ice are possible, especially in northern CT and NW RI.

*Confidence*: *High*. There will be light snow across most areas by around
3 to 4 AM, then will become steadier and heavier by mid morning. There is
still some uncertainty as to the exact timing of the changing precipitation
type during the morning, which will affect the ice and snow accumulations
especially near and north of the Mass Pike.

*Arctic Blast moving in Wednesday night and Thursday*

*Potential for:* *Wind Chill Headlines* *late Wednesday night into early
Thursday morning*.  Wind chill values of -10 to -20 degrees by early
Thursday morning

A strong Arctic cold front will swing across the region Wednesday
afternoon, bringing increasing NW winds along with dropping temperatures.
Expect temperatures to bottom out in the single digits across central and
western areas by around 6 AM Thursday morning, ranging to the teens to
around 20 across the coastal plain. With the strong winds, with gusts
upwards to 25 to 40 mph, will see wind chill indices as low as *-10 to -20
degrees* across portions of central and western Massachusetts, especially
across the higher terrain, ranging to around zero to near 10 below
elsewhere.

*Confidence*:  *Moderate to High*. The lowest wind chill values will occur
from *3 to 4 AM through 9 to 10 AM*, longest across central and western
Massachusetts.  Highs on Thursday will only reach from 15 to 25 degrees,
except the upper 20s along the immediate south coast, but wind chill values
will remain low, mainly from *zero to 10 above*.

Eleanor Vallier-Talbot

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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