Severe Weather Coordination Message #1 – Wednesday PM/Evening 7/30/25 Severe Weather Potential
Hello to all…
..A cold front will approach Southern New England Wednesday Afternoon and Evening setting the stage for Isolated to Scattered Strong to Severe Thunderstorms with strong to damaging winds, hail, frequent lightning and heavy rainfall leading to urban and poor drainage flooding as the main threats..
..The Storm Prediction Center (SPC) has placed Southern New England from essentially the Rte-24 corridor north and west through North-Central Rhode Island, Connecticut, Western, Central and Eastern Massachusetts in a marginal risk for severe weather. Timeframe for severe weather is between 2-10 PM ET Wednesday..
..A Heat Advisory is in effect through 8 PM Wednesday for all of Southern New England except for the east slopes of the Berkshires, Cape Cod and the Islands with heat indices up to 101 degrees. Use caution in working outdoors, take frequent breaks, spend time in cooler areas and stay hydrated..
..Heavy rainfall including from thunderstorms is possible Thursday into early Friday potentially resulting in flooding issues as the cold front stalls over Southern New England before moving south of the region Friday bringing pleasant weekend weather. Further details on this heavy rainfall for Thursday into early Friday will follow after the severe weather potential for Wednesday has passed..
..SKYWARN Self-Activation with Amateur Radio Call-Up Nets are possible to likely for Wednesday Afternoon and Evening. SKYWARN Activation with Amateur Radio Call-Up Nets are also possible Thursday into early Friday for heavy rainfall/flood potential. Pictures and videos of storm damage, hail, and flooding can be sent as a reply to this email, via our WX1BOX Facebook, X and Bluesky feeds or to the email address pics@nsradio.org with credit given to the spotter unless otherwise indicated..
One more day of heat and humidity before a cold front moves into the area Wednesday Afternoon and Evening and stall over Southern New England Friday then shifts south of the area during the day Friday. The headlines depict the current thinking. Key factors include:
1.) The timing of the cold front into the area near the time of peak heating to take advantage of strong wind shear profiles.
2.) Frontal forcing, instability and wind shear to offset some unfavorable severe weather parameters.
3.) Mid-level drying during the day Wednesday if that occurs and whether moisture returns in the mid-levels during the time of peak heating.
3.) As always with severe/non-severe thunderstorm events, not all locations will receive a severe/non-severe thunderstorm. They will be isolated to scattered with pockets of wind damage, hail and urban/poor drainage flooding in those isolated to scattered locations.
Heavy rainfall including from thunderstorms is possible Thursday into early Friday potentially resulting in flooding issues as the cold front stalls over Southern New England before moving south of the region Friday bringing pleasant weekend weather. Further details on this heavy rainfall for Thursday into early Friday will follow after the severe weather potential for Wednesday has passed.
SKYWARN Self-Activation with Amateur Radio Call-Up Nets are possible to likely for Wednesday Afternoon and Evening. SKYWARN Activation with Amateur Radio Call-Up Nets are also possible Thursday into early Friday for heavy rainfall/flood potential. Pictures and videos of storm damage, hail, and flooding can be sent as a reply to this email, via our WX1BOX Facebook, X and Bluesky feeds or to the email address pics@nsradio.org with credit given to the spotter unless otherwise indicated. Another coordination message will be posted by 11 AM Wednesday Morning. Below is the NWS Boston/Norton Heat Advisory Statement, Area Forecast Discussion, Enhanced Hazardous Weather Outlook and SPC Day-2 Convective Outlook:
NWS Boston/Norton Heat Advisory Statement:
https://forecast.weather.gov/product.php?site=NWS&issuedby=BOX&product=NPW&format=CI&version=1&glossary=1&highlight=off
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/2025/day2otlk_20250729_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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