Storm Coordination Message #2 – Monday Afternoon 11/30/20-Tuesday Morning 12/1/20 Damaging Wind/Heavy Rainfall Potential

Hello to all…

..Powerful storm system will bring heavy rainfall, strong to damaging winds, the possibility for Isolated Strong to Severe Thunderstorms and possibly some minor coastal splashover to minor coastal flooding to Southeast New England Monday Afternoon through early Tuesday Morning..
..A High Wind Watch remains in effect for Monday Afternoon and Evening for Eastern Essex, Eastern Norfolk, Bristol, Plymouth Counties, Cape Cod and the Islands and all of Rhode Island except Northwest Rhode Island for sustained winds of 20-30 MPH with gusts to 60 MPH and isolated higher gusts possible. A Wind Advisory is now in effect from 3 PM to 12 AM for Central and Southeast Middlesex, Western Essex, Suffolk, and Western Norfolk Counties of Massachusetts and Northwest Providence County Rhode Island for sustained winds of 15-25 MPH with gusts to 50 MPH with isolated gusts possible. These winds will result in isolated to scattered pockets of tree and power line damage..
..The Storm Prediction Center (SPC) continues Connecticut, Rhode Island and Southeast Massachusetts in a marginal risk for severe weather for Monday with damaging winds brought to the surface in any thunderstorms as the main threat..
..Rainfall of 1-3″ with isolated higher amounts could cause urban and poor drainage flooding. Strong winds may cause minor splashover to minor coastal flooding in Southeast New England..
..SKYWARN Self-Activation will monitor the storm for rainfall reports, rainfall and coastal related flooding and measured wind gust and wind damage reports..

A powerful storm system will track west of Southern New England putting the region in the strong to damaging wind, heavy rain side of the storm with even the potential for strong to severe thunderstorms in Southeast New England. The headlines depict the latest thinking. Key factors include:

1.) The strength of the low level winds and the ability of the strong winds to reach the surface in either heavy rainfall or thunderstorms to cause higher wind gusts. The timeframe from 3 PM-12 AM is where the highest winds are expected with strong to damaging winds possibly lasting beyond 12 AM Tuesday over Cape Cod and the Islands.
2.) Depending on instability levels and wind fields, an isolated tornado cannot be ruled out in the marginal severe weather risk area of Connecticut, Rhode Island and Southeast Massachusetts and will be monitored closely.
3.) Heaviest and higher end rainfall amounts and how widespread they are based on thunderstorm development or how widespread the heavy rain swath is.

SKYWARN Self-Activation will monitor the storm for rainfall reports, rainfall and coastal related flooding and measured wind gust and wind damage reports. Another coordination message will be posted by 1030 AM Monday Morning. Below is the NWS Boston/Norton Area Forecast Discussion, High Wind Watch/Wind Advisory Statement, Enhanced Hazardous Weather Outlook, SPC Day-2 Convective Outlook:

NWS Boston/Norton Area Forecast Discussion:
https://kamala.cod.edu/ma/latest.fxus61.KBOX.html

NWS Boston/Norton High Wind Watch/Wind Advisory Statement:
https://kamala.cod.edu/ma/latest.wwus71.KBOX.html

NWS Boston/Norton Enhanced Hazardous Weather Outlook:
https://www.weather.gov/box/ehwo

SPC Day-2 Convective Outlook:
https://www.spc.noaa.gov/products/outlook/archive/2020/day2otlk_20201129_1730.html

Respectfully Submitted,

Robert Macedo (KD1CY)
ARES SKYWARN Coordinator
Eastern Massachusetts ARES Section Emergency Coordinator
Home Phone #: (508) 994-1875 (After 6 PM)
Home/Data #: (508) 997-4503 (After 6 PM)
Work Phone #: 508-346-2929 (8 AM-5 PM)
Email Address: rmacedo@rcn.com
http://ares.ema.arrl.org
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