Storm/Severe Weather Coordination Message #1 – Friday 11/11/21 Heavy Rainfall/Strong Wind/Isolated Severe Thunderstorm Potential

Hello to all…

..A strong cold front will bring a period of brief heavy rainfall with a quick 1-2″ of rain, strong wind gusts of 35-45 MPH with isolated higher gusts at the coast, and the possibility for isolated strong to severe thunderstorms with damaging winds as the primary threat and even an isolated tornado as a secondary threat Friday Morning through early Friday Evening. The Storm Prediction Center (SPC) has placed Connecticut, Rhode Island, Southwest, South-Central and Southeast Massachusetts in a marginal risk for severe weather..
..SKYWARN Self-Activation will monitor the severe weather, strong wind and heavy rainfall potential for Friday..

A strong cold front will bring a brief period of heavy rainfall, strong wind gusts and isolated severe thunderstorm potential. The headlines depict the current thinking. Key factors include:

1.) Amount of instability or ability for strong winds aloft and jet dynamics to allow for any isolated strong to severe thunderstorms to form along the cold front.
2.) Ability for strong winds in any convective showers and thunderstorms to reach the surface. If temperatures reach the mid-60s or higher, these winds will have a greater potential to reach the surface.
3.) Any flooding should be confined to nuisance urban and poor drainage flooding but will be monitored.

SKYWARN Self-Activation will monitor the severe weather, strong wind and heavy rainfall potential for Friday. Another coordination message will be posted by 1000 AM Friday Morning. Below is the NWS Boston/Norton Area Forecast Discussion, SPC Day-2 Convective Outlook, and Wind Gust Map (Wind Gust Map is outside of any severe thunderstorms):

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

SPC Day-2 Convective Outlook:
https://www.spc.noaa.gov/products/outlook/archive/2021/day2otlk_20211111_1730.html

NWS Boston/Norton Wind Gust Map:
http://wx1box.org/wp-content/uploads/2021/11/NWS_Wind_Gust_Map_Friday_11_12_21.png

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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