[Weather] [2019.01.20 PM NWS Boston Weather Briefing] Storm Moving Out, Arctic Air Surging In

[BOX Operations - NOAA Service Account]

Good afternoon everyone,

Attached is our updated briefing package outlining concerns through Monday
morning.

*What / Where / When ...*

   - Lingering winter weather
      - A mix of freezing drizzle and/or sleet will linger into the early
      evening hours, as late as 7 pm across the E MA coastline
      - Additional ice accretion of a trace forecast through that time
      - Winter weather advisories over RI and Southeast MA through 7 pm


   - Flash Freeze, Slick Conditions
   - Flash freeze ongoing along and southeast of the Boston to Providence
      corridor
      - Rapid freezing of wet surfaces, standing water
      - *By evening*, Boston to Providence will be in the teens, S&E in the
      20s, Cape & Islands above freezing
      - *At midnight*, Boston to Providence will be in the single digits,
      S&E in the teens, Cape & Islands in the low 20s


   - Bitterly Cold Wind Chills
   - Bitterly cold wind chills of -15 to -30°F tonight into Monday morning.
      - Bitter cold will continue through Tuesday morning with wind chills
      around -10 to -15°F
      - Wind Chill headlines through Monday


   - Potential Downed Limbs, Isolated Power Outages
   - Gusty winds may result in downed limbs and/or isolated power outages
      across areas N&W of the Hartford to Boston corridor where
observed heavier
      amounts snow and ice remain on trees.


   - Moderate to Heavy Freezing Spray
   - Gale Warnings on all waters through Monday morning (may need to be
      extended as late as Tuesday morning).
      - Moderate to locally heavy freezing spray later tonight through
      Monday night


   - Minor Coastal Flooding
   - East-coastal MA Monday morning
      - Isolated pockets of minor flooding along the coast for typically
      prone locations, especially Boston Harbor south to Cape Cod Bay,
as well as
      northern Nantucket
      - Mainly due to lingering swell and high astronomical tides

*Confidence ...*

   - High confidence overall, but can't rule out colder temperatures
   surging in a bit faster by an hour than presently forecast resulting in a
   quicker freeze across Southern New England.


   - It's the expectation that as the storm presently passing over SE New
   England sweeps out to sea that cold air will surge quickly S&E over
   above-freezing areas of SE New England. Definitely a flash freeze is to be
   expected no matter what into this evening with all locations below
   freezing, Nantucket at the latest by 9 pm.

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

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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