[Weather] [2019.01.28 AM NWS Briefing] Accumulating Snowfall, Dangerously Cold Wind Chills

[BOX Operations - NOAA Service Account]

Good afternoon,

The *WINTER STORM WATCH* continues over northern and western portions of MA
with the expected accumulating snowfall for Tuesday afternoon into
Wednesday morning.

To clarify why we held with the *WATCH*. It is entirely possible the
associated storm system could move through faster and we could get less. It
is also possible that the heavier precipitation / snowfall outcomes occur
outside of MA, more across northern areas of New England. While there is
concern of travel impacts outlined below, there is still not a high level
of confidence with this forecast.

Behind the snows, bitter cold and dangerously low wind chills follow for
Wednesday into Thursday.

Attached, you'll find the latest headlines and snowfall forecast, along
with worst-case and best-case scenarios, for Tuesday afternoon into
Wednesday morning along with forecast precipitation types. Also, we've
included forecast lowest wind chills for Wednesday through Thursday.

Should you have any questions, comments and/or concerns, please don't
hesitate to reach out to us.

*What / Where / When ...*

   - Accumulating Snowfall
      - *Timeline* ... broadly speaking, beginning around noon Tuesday for
      the CT River Valley, encompassing eastern MA by early evening; becoming
      moderate, possibly heavy at times over northern / western MA
early evening
      Tuesday to shortly after midnight Wednesday before concluding into early
      morning Wednesday.
         - Challenges with respect to the rain / snow transition line,
         monitoring the Hartford - Worcester - Boston corridor especially.
         - To get the more finer details we encourage everyone to check out
         the hourly weather graph for their particular area by
clicking on the map
         in the link below:
         -
         https://forecast.weather.gov/gridpoint.php?site=box&TypeDefault=graphical
         - *Impacts *... slick conditions on untreated roads and hazardous
      travel, especially for the Tuesday afternoon into evening
commute. Watching
      closely the I-91 corridor throughout CT & MA, as well as the
western-halves
      of I-90 and Route 2.


   - Dangerously cold wind chills
      - *Timeline *... developing towards noon Wednesday as Arctic air
      surges into the region per westerly winds with gusts up to 40 mph;
      especially Wednesday night into Thursday, dangerously cold wind chills
      could continue through Friday morning while bitter cold persists into
      Saturday.
      - *Impacts *... with greater exposure to the elements, roughly 30
      minutes, there is the risk for hypothermia and frostbite. Can't rule out
      isolated issues with freezing pipes.
      - *Marine Impacts* ... moderate freezing spray forecast with gales
      and wave heights up as high as 8 to 12 feet, expect dangerous conditions
      for all vessels, even those properly equipped for Wednesday through
      Thursday.

*Uncertainty ...*

   - Biggest challenge is nailing down the exact evolution of the rain /
   snow line which will ultimately determine snowfall amounts and outcomes.
   - In addition, there is a measure of uncertainty concerning snowfall
   amounts, whether meeting or exceeding 3" advisory / 6" warning level
   criteria for particular counties, hence the continuance of the WATCH.


Respectfully,

Benjamin Sipprell
Meteorologist
NWS Boston / Norton

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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