[Weather] [2019.11.21 PM] NWS Boston EM Briefing: Potential Weather Hazards through the Weekend

[BOX Operations - NOAA Service Account]

We continue to monitor two weather systems this weekend for possible
hazardous weather. There have been a couple of changes since this morning:

*Tonight:*
Strong west winds tonight follow a cold front that moved through during the
afternoon and evening.  This will mainly affect the marine community.

*Marine Impacts: Gale Force Winds*
*Locations*: Massachusetts and Rhode Island coastal waters
*Timing:* Onset of Gales between 4 and 7 PM, ending between 4 and 8 AM
Saturday.
*Wind Gusts:* W 30 to 40 knots, peaking between 8 PM and 2 AM.
*Seas:* 4 to 7 feet on the inner bays and sounds; 7 to 11 ft offshore.
*Impact:* Hazardous conditions for mariners.
*Uncertainty:* High confidence.

*Saturday Night and Sunday:*
Low pressure is expected to track near Nantucket. As rain overspreads the
region Saturday night, it will be cold enough for a wintry mix across parts
of the interior with the potential for light icing and impacts to travel.
Milder air will cause a change to rain Sunday morning.

*Interior Light Icing and Light Snow (See Attached Images):*
*Locations*: Western and Central Massachusetts, possibly northwest Hartford
County, CT, especially in the higher elevations.
*Timing:* Wintry mix of snow and light freezing rain late Saturday night
into early Sunday morning, changing to rain by late morning or early
afternoon.
*Impact*: Slippery travel.  Snow and ice amounts will be light, with up to
two inches of snow in the higher elevations and a light coating (up to
1/10") of ice.
*Uncertainty:* Timing of the exact changeover.

*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.

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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