Severe Weather Coordination Message #2 – Friday Afternoon and Evening 6/6/25 Severe Weather/Flash Flood Potential
Hello to all…
..Isolated Severe Thunderstorm this morning caused significant wind damage and large hail in Ayer/Shirley MA and to a lesser extent in Leominster MA between 650 to 730 AM Friday Morning. Additional Isolated to Scattered Strong to Severe Thunderstorms likely this Friday Afternoon and Evening across much of interior Southern New England with strong to damaging winds, hail, frequent lightning and torrential rainfall leading to urban and poor drainage flooding to flash flooding for portions of the region..
..The Storm Prediction Center (SPC) continues a slight risk for severe weather with a marginal risk for severe weather for North-Central Rhode Island and the rest of Eastern Massachusetts away from the south coast. Timeframe for severe weather is between 2-10 PM this Friday Afternoon and Evening..
..A Flood Watch is now in effect through late Friday Evening for Franklin, Hampshire, Hampden, Worcester, Middlesex, and Western Essex Counties of Massachusetts for localized flooding of 2-3″ of rain causing localized urban and poor drainage flooding to flash flooding..
..SKYWARN Self-Activation will monitor any severe thunderstorm potential Friday Afternoon and Evening. 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. .
This morning an isolated severe thunderstorm caused significant wind damage and large hail in the communities of Ayer and Shirley and to a lesser extent Leominster, MA. The current log of that storm activity can be seen below:
WX1BOX Amateur Radio/non-Amateur Radio reports log:
https://wx1box.org/wp-content/uploads/2025/06/reports_6_6_25.pdf
Isolarted to scattered strong to severe thunderstorms remain a concern for much of interior Southern New England for this Friday Afternoon after 2 PM through 10 PM. The headlines depict the current thinking. Key factors include:
1.) Sufficient heating and destabilization for strong to severe thunderstorm development. This has occurred despite some of the overnight and early Friday Morning strong to severe thunderstorm activity.
2.) Timing of forcing and triggering of the atmosphere at the time of peak heating which is currently lined up appropriately for isolated to scattered strong to severe thunderstorm development. While wind fields are marginally sufficient for severe thunderstorm development, other instability parameters are favorable and it also appears wind shear values are a bit stronger than indicated based on earlier this morning severe thunderstorm activity.
3.) As always with severe thunderstorm events, not all locations will receive a 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.
SKYWARN Self-Activation will monitor any severe thunderstorm potential Friday Afternoon and Evening. This will be the last coordination message as we shift into operations mode. Below is the NWS Boston/Norton Area Forecast Discussion, Enhanced Hazardous Weather Outlook and SPC Day-1 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-1 Convective Outlook:
https://www.spc.noaa.gov/products/outlook/day1otlk.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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