[Weather] ['2019.12.15 AM] Boston EM Briefing: Strong Winds & River Rises Today; Winter Weather Potential Mon Night thru Tue

Sun Dec 15 13:08:48 UTC 2019

Good morning.

Expect strong winds to continue today into Sunday. River levels at several
locations continue to slowly rise.  Also, there is still the threat of
accumulating snow and mixed wintry precipitation that will likely affect
the region Monday night and Tuesday.

Attached please find our current forecast for wind gusts for today, then
the forecast snow and ice amounts for the winter weather that is expected
Monday night and Tuesday.

*Changes with this update:*

   - *Wind Advisory:* Remains in effect for most of Massachusetts (except
   Bristol County) through 7 PM, then continues through *9 PM* for
   Nantucket, Martha's Vineyard and Block Island (New Shoreham).
   - Updated snow and ice accumulations for Monday Night and Tuesday.
   - Updated River levels and timing to lower below flood stage for points
   on the Connecticut, Wood and Pawcatuck Rivers

*River Rises, Strong Winds and Rough Seas: Today through Monday*

*River Rises/Minor Flooding:*
*Locations*:The Pawcatuck River at Westerly, Wood River at Hope Valley, and
the Connecticut River at Hartford and Middle Haddam.
*Timing*: Through this evening at Hope Valley, and through Monday at
Westerly, Hartford and Middle Haddam.
*Impact*: Rivers rising to near or over minor flood stage.
*Trends*: Slowly rising at Westerly, cresting this afternoon at Hope Valley
and late Monday morning at Hartford, Rising to above flood stage by early
Monday afternoon at Middle Haddam.
*Confidence*: Moderate to High.

*Strong Winds:*
*Locations*: Most of Massachusetts except Bristol County, as well as Block
Island in RI and Nantucket and Martha's Vineyard in MA.
*Timing*: Through this evening. Strongest winds late this morning and
afternoon.
*Wind Speeds*: W to NW winds 20 to 30 mph with gusts 45 to 50 mph.
*Impact*: Gusty winds could blow unsecured objects around. Tree limbs could
be blown down and a few power outages may result.
*Confidence*: High.

*High Seas: *
*Locations*: Coastal waters from Provincetown to Chatham to Nantucket and
out 20 nm, Coastal waters 25nm south of Martha's Vineyard and Nantucket.
*Timing*: Through 7 PM Sunday.
*Wave Heights*: 10 to 15 feet.
*Impact*: Hazardous seas combined with strong winds could capsize or damage
vessels.
*Confidence*: High.

*Accumulating Snow to Wintry Mix: Monday Night and Tuesday*

We are continuing to monitor a period of wintry weather for Monday night
and Tuesday. Confidence continues to increase that conditions will
deteriorate Monday overnight through the Tuesday morning commute, and be
impacted by snow and/or ice covered roads with potential for travel
difficulties.

The precipitation will begin as snow across most of the region, except as a
mix of rain, sleet and snow along the immediate south coast Monday evening.
Expect the snow to gradually change to a wintry mix by around 1 to 3 AM
Monday. While most of the interior will remain a wintry mix, the snow
and/or mixed precipitation will change over to all rain across E and SE MA
into coastal RI, as temperatures warm rise to above freezing earlier.

*Confidence:* Remains moderate to high on wintry weather impacting the
Tuesday morning commute, though Moderate confidence in snow and ice
accumulations. Changeovers for precipitation type and timing remain
uncertain which may alter the overall snow and/or ice accumulations. There
is the potential for steadier bands of snow that may produce snow rates at
or an inch per hour or a bit higher into early Tuesday morning, though it
is not clear where any of the bands may set up.

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
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