[Weather] [2020-04-11 PM] NWS Boston EM Briefing for Damaging Winds/Thunderstorms on Monday

Sat Apr 11 20:55:50 UTC 2020

Good afternoon,

Confidence has increased this afternoon in the potential for damaging wind
gusts and power outages on Monday. Greatest time of concern is late Monday
morning into early Monday evening.

Attached are graphics of the watches that have been issued, the maximum
wind gusts and maximum wave heights expected on Monday.

*Changes since the last update:*

   - High WInd Watches Issues for all of southern New England.
   - Concern increasing in the potential for damaging wind gusts and power
   outages.

*Headlines:*

   - High Wind Watch for all of  southern New England from Monday morning
   until Monday evening
   - Storm Watch in effect for the ocean waters from Monday morning into
   Monday evening

*Details:*

*Damaging Winds:*

South wind gusts of 55 to 75 mph are possible late Monday morning through
Monday evening. Greatest time of concern is late Monday morning into early
Monday evening. The highest gusts are expected along the south coast,
including Cape Cod and the Islands, but damaging wind gusts are possible
across all of southern New England.

*Heavy Rain:*

Rainfall amounts of 1 to 2 inches are possible from late Sunday night
through Monday. Locally higher amounts are possible where any thunderstorms
move through.

*Thunderstorms:*

Thunderstorms will be possible ahead of a cold front Monday afternoon and
early Monday night. Some of these storms could become severe bringing
damaging winds, lightning and heavy rain.

*Wave Heights:*

Expect waves to build across the ocean waters to 10 to 15 feet across the
eastern waters and 15 to 20 feet across the southern waters. The highest
waves are anticipated further offshore. No coastal flooding is anticipated
due to low astronomical tides.

*Impacts:*

   - Scattered to perhaps even widespread power outages due to downed
   trees, tree limbs and power lines. Difficult travel for high profile
   vehicles.
   - Any thunderstorms may bring an increased risk for damaging wind gusts
   along with cloud to ground lightning.
   - Heavy rain may cause brief localized urban and poor drainage flooding.

*Uncertainty:*

   - We are confident in strong to damaging wind gusts Monday, but the
   magnitude of the wind gusts is more uncertain. If we end up on the lower
   end with mainly 50 to 60 mph wind gusts, we will have scattered power
   outages. On the other hand, if wind gusts end up in the 65 to 75 mph range,
   widespread power outages would be possible.
   - How widespread thunderstorm coverage will be is also uncertain.

Thanks

Rodney Chai, Hayden Frank and Bill Leatham

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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