Severe Weather Coordination Message #1 – Thursday 6/18/26 Severe Weather & Strong Wind Gusts Outside of Thunderstorms Potential

Hello to all…

..Isolated to Scattered Strong to Severe Thunderstorms possible Thursday PM and Evening any time between 12 PM to 11 PM across all of Southern New England with the greatest threat over Western and Central Massachusetts and Connecticut..
..Strong to damaging winds, hail, frequent lightning and heavy downpours leading to urban and poor drainage flooding are the main threats and an isolated tornado as a secondary threat cannot be ruled out. The Storm Prediction Center has all of Southern New England in a Slight Risk for severe weather Thursday..
..In addition, Strong Wind Gusts to around 40 MPH with isolated higher wind gusts are likely Thursday which will have the potential for isolated pockets of tree, wire damage and power outages independent of any strong to severe thunderstorms..
..SKYWARN Self-Activation with Amateur Radio Call-Up Nets possible if SKYWARN reportable criteria is met and/or if a severe thunderstorm warning is issued Thursday PM and Evening. Pictures and videos of wind damage, hail, flooding etc. can be sent as a reply to this email, via our Facebook/X/Bluesky feeds or the email address pics@nsradio.org with credit given to the spotter unless otherwise indicated..

The headlines depict current thinking on severe weather potential for Thursday. Key factors include:
1.) If more instability develops than expected with sunshine and destabilization, strong wind shear profiles could lead to a potentially more significant severe weather threat and this aspect will bear watching. If instability is limited, the severe weather potential will be more muted.
2.) Very strong wind shear profiles even with more limited instability could lead to a low instability, high shear environment that may allow for damaging wind and severe thunderstorm potential.
3.) Outside of any strong to severe thunderstorms, given strong low-level wind fields, wind gusts to around 40 MPH with potential for higher wind gusts could lead to isolated pockets of tree, wire damage and power outages.

SKYWARN Self-Activation with Amateur Radio Call-Up Nets possible if SKYWARN reportable criteria is met and/or if a severe thunderstorm warning is issued Sunday Evening. Another coordination message will be posted by 1230 PM Thursday PM. Pictures and videos of wind damage, hail, flooding etc. can be sent as a reply to this email, via our Facebook/X/Bluesky feeds or the email address pics@nsradio.org with credit given to the spotter unless otherwise indicated. Below is the NWS Boston/Norton Area Forecast Discussion, Enhanced Hazardous Weather Outlook and SPC Day-2 Convective Outlook:

NWS Boston/Norton Area Forecast Discussion:
https://forecast.weather.gov/product.php?site=NWS&issuedby=BOX&product=AFD&format=CI&version=1&glossary=1&highlight=off

NWS Boston/Norton Enhanced Hazardous Weather Outlook:
https://www.weather.gov/erh/ghwo?wfo=box

SPC Day-2 Convective Outlook:
https://www.spc.noaa.gov/products/outlook/archive/2026/day2otlk_20260617_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)
Email Address: rmacedo@rcn.com
https://ares.ema.arrl.org
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