[Weather] [2025.12.28 AM] NWS Boston EM Briefing: Freezing Rain Sunday Night to Early Monday

[BOX Operations - NOAA Service Account]

Good Morning.

Confidence continues to grow in a period of freezing rain tonight, moving
into southern New England between 7-10pm, and changing over to rain from
south to north between midnight and 4am.  Ice accretion will be highest in
the northern CT river valley with up to a quarter inch of ice is possible.
Elsewhere, we are generally expecting anywhere from a trace to a tenth of
an inch of ice.

A Winter Weather Advisory has been expanded to include the Northshore,
Boston, and western Kent County RI.  There is still uncertainty on if
temperatures will be sub-freezing around the south shore tonight when
precip arrives. Advisories could be expanded south this afternoon if
confidence in freezing rain increases today.

Icy roads and sidewalks will be the main hazard, with impacts to the
Monday morning commute possible. However the potential for tree and
powerline damage will also exist in portions of the CT River and Merrimack
Valleys, where ice accretions look to be more significant and coinciding
with where leftover snow from the recent snowstorm is still clinging to
trees and powerlines.

Following supporting attachments include:

   - One-page briefing sheet.
   - Winter Weather Advisory area.
   - Official NWS Storm Total Flat Ice Accretion Forecast***.
   - Exceedance Probabilities for 0.1", 0.25", and 0.5" or more of flat ice
   accretion*.

* *Note*: NWS forecasts horizontal or flat ice accretions. If interested in
radial icing (such as icing accretion occurring around powerline wires or
tree branches), multiply the flat ice forecast values by 0.4.

Expect the next briefing to be sent* by 6pm this afternoon. *

Thank You!

Meteorologist: Kyle Pederso


If you have any questions or would like more information, please don't
hesitate to contact us. You can reach us via:
email: box.operations at noaa.gov
phone: 508.622.3280
Slack/NWSChat 2.0 <https://nwschatws.slack.com/> (for approved partners)
social media: Website <http://www.weather.gov/boston> | Facebook
<http://www.facebook.com/NWSBoston> | Twitter
<http://www.twitter.com/NWSBoston>
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