[Weather] [2019.11.23 AM] NWS Boston EM Briefing: Potential Weather Hazards through the Weekend

[BOX Operations - NOAA Service Account]

Good morning,

Following is an update on potential weather-related hazards from an area of
low pressure that is expected to move from the mid-Atlantic through
southeastern Massachusetts. This system is expected to produce a wintry mix
of freezing rain and snow across the Berkshires into northern Worcester
County Sunday, with mainly rain elsewhere in Southern New England. It will
also bring a period of gusty winds Sunday night to the coastal waters,
along with the potential for minor coastal flooding in parts of eastern
Massachusetts during Sunday's high tides.

*Changes with this update:*

   - Gale Watch Issued [Sunday into Sunday Night]: Coastal and offshore
   waters.
   - *Updated Snow and Ice Accumulations*. *Note:* Portions of the
   Berkshires into northern Worcester County *may* need winter weather
   advisories for parts of Sunday in forthcoming updates.


Details below:

*Interior Light Icing and Light Snow (See Attached Images):*
*Locations*: Mainly the northern Worcester Hills and the Berkshires.
*Timing:* Begins as light freezing rain into the pre-dawn hours Sunday
morning, changing to rain by late morning or early afternoon. Ending as a
period of light accumulating wet snow Sunday night.
*Expected Amounts:* A light glaze of ice (up to 1/10"), with up to 2 inches
of snow at the highest elevations.
*Impact*: Slippery travel.
*Uncertainty:* Timing of the exact changeover may affect snow and ice
accumulations. *To convey this uncertainty and its effect on snowfall
amounts, a reasonable worst-case snow accumulation is also attached (if
precipitation to change over to snow sooner); in addition to the expected
snow amounts.*

*Marine Impacts: Gale Force Winds [Sunday Night]*
*Locations*: Massachusetts and Rhode Island coastal & offshore waters.
*Timing:* Onset of Gales between 2 and 4 PM Sunday, ending between 4 and 8
AM Monday.
*Wind Gusts:* Northwest 35 to 42 knots, peaking between 6 PM Sunday and 2
AM Monday.
*Seas:* 4 to 6 feet on the inner bays and sounds; 7 to 11 ft offshore.
*Impact:* Hazardous conditions for mariners.
*Uncertainty:* High confidence in occurrence, though uncertainty on exact
start and ending times.

*Minor Coastal Flooding: Sunday Morning High Tide*
*Locations*: Eastern Massachusetts coast (including Martha's Vineyard and
Nantucket) and the South Coast
*Timing:* Sunday morning high tide (5:41 AM at Providence, 8:45 AM at
Boston, and 9:46 AM on Nantucket)
*Storm Surge:* 1.0 to 1.5 feet
*Inundation:* Less than 1 foot above ground level
*Impact*: Some vulnerable shoreline roads may become temporarily impassable
around high tide.
*Uncertainty:* High. Timing of highest surge may not coincide with high
tide, which would lead to little or no impact. Minor coastal flooding would
be the worst case scenario.

*Minor Coastal Flooding: Sunday Evening High Tide*
*Locations*: Eastern Massachusetts coast including Martha's Vineyard and
Nantucket
*Timing:* Sunday evening high tide (9:17 PM at Boston and 10:24 PM on
Nantucket)
*Storm Surge:* Around 2.0 feet
*Inundation:* Up to 1 foot above ground level
*Impact*: Some vulnerable shoreline roads may become temporarily impassable
around high tide.
*Uncertainty:* Lower than with the morning high tide. Locations along the
Bay side of Cape Cod, Plymouth County, and Nantucket are most vulnerable.

Thank You!

Meteorologist: Andrew Loconto

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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