A stalled front draped from SW to NE across southern New England helped to initiate a severe thunderstorm over the south shore of MA. 5 inch hail.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BOX wrote it up.
A stalled front draped from SW to NE across southern New England helped to initiate a severe thunderstorm over the south shore of MA. This storm caused sporadic wind damage and produced 1.5 inch hail.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boston/Norton, MA wrote its last area forecast discussion before the first event at Aug 14, 1:41 PM EST, 4 hours 19 minutes earlier.
Area Forecast Discussion National Weather Service Boston/Norton MA 241 PM EDT Thu Aug 14 2025 .SYNOPSIS... Scattered showers and thunderstorms again today along with a low risk for some urban flash flooding. Seasonable temperatures and lower humidity levels are expected for Friday and Saturday, although temperatures briefly warm up again for Sunday. After midweek, our next chance for rain is with a cold front which looks to move in on Monday. && .NEAR TERM /THROUGH TONIGHT/... Key messages... * Scattered showers and thunderstorms possible this afternoon and evening, some of which could lead to localized urban flash flooding. The surface low slowly moving offshore has draped a stalled cold front across southern New England which will finally push out later tonight. Over southeast MA and RI, ahead of the front, a plume of anomolously deep moisture sits with PWATs near 2 inches. This, together with tall-skinny CAPE profiles, deep warm cloud depths, and slow storm motion will mean a risk of some storms bringing heavy downpours that could lead to localized flash flooding. The greatest risk will remain ahead of the front, over the South Coast and southern RI, as a swath of dry air is quickly moving into western MA behind the front. Will likely see a few quick pop-ups in western MA and/or northern RI, but they should be very brief. Any flooding issues are expected to be isolated as opposed to widespread. We continue to carry the Marginal Risk (level 1 or 4) of flash flooding. The positively tropical-feeling airmass continues for one more day as highs reach well into the 80s with dewpoints in the 70s. Drier air kicks in behind the front later tonight. && .SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/... Key messages... * Cooler temperatures and drier weather kick off the weekend. Friday stands to be more tolerable temperature-wise. Afternoon temps will still be in the low to mid 80s, but dewpoints will be significantly lower... in the upper 50s to low 60s. The dry airmass moving in behind the cold front will clear out skies and bring plenty of sunshine to kick off the weekend. && .LONG TERM /SATURDAY THROUGH THURSDAY/... Key Messages: * Seasonable temperatures with lower humidity levels Sat * Warmer and more humid Sunday with chances for showers/thunderstorms in afternoon/evening. * Cooler next week with potential for some scattered showers Tues- Thurs in spots. Saturday: Surface pressure persists over southern New England Saturday keeping conditions dry with seasonable temperatures. Highs temperatures should range in the low to mid 80s. Weak pressure gradient and high pressure center in the east will support easterly component winds/localized sea breezes along the east coastline. This will keep the coastal areas a bit cooler in the mid-upper 70s. Sunday: A shortwave trough in the mid-level flow aloft moves through on Sunday with an accompanying cold front. Surface winds turn more southwesterly with brief advection of higher moisture/dewpoint air into southern New England. Weak warm advection will bring temperatures into the mid-upper 80s with elevated humidity levels making it feel like low 90s. Daytime heating, moisture, and an approaching front/shortwave should support development of afternoon showers and thunderstorms. Deterministic and ensemble guidance show at least marginal instability in place with some uncertainty on how far east the instability axis extends into southern New England. Upper level forcing appears to be limited overall, so coverage will be more likely scattered in nature. Overall there will be low chances (25-40%) for afternoon-early evening showers and thunderstorms, with better chances further west. Next Week: The cold front will push through the region overnight Sunday into early Monday bringing in a cool airmass to start the week. Ensemble guidance shows the airmass to be below normal with 850mb temperatures 10-12C. This will bring much cooler highs in the 70s, perhaps a few 80s in the CT Valley. Flow aloft will be generally weak troughing with a weak shortwave or two moving through during the week. This may bring weak isolated to scattered showers. Given fairly weak forcing and uncertainty in timing of the waves this far out, timing of precipitation is low confidence still. Although there seems to be chunks of members showing higher probabilities for seeing showers Tuesday/Wednesday and potentially into Thursday. Confidence should increase as we get closer, but overall not expecting any significant rainfall with these weaker shortwaves. Still very far away, but overall activity in the tropics has seen an uptick in the past few weeks. We continue to monitor for impacts from tropical system Erin as it recurves N/NE'ward (in some fashion) late next week. At this point, any impact will be offshore (marine, rip currents, surf). Again, this will continue to be monitored as we get closer and more confident/detailed information will become available. && .AVIATION /19Z THURSDAY THROUGH TUESDAY/... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. 18z TAF Update: Today...Moderate confidence overall. Low confidence in placement/timing of showers/storms. Scattered showers and t-storms are possible again this afternoon and evening. Confidence is lower with respect to timing and chances as coverage is more scattered in nature. Lightning, brief gusty winds/outflows, and heavy rain possible in any storms. Tonight...Moderate confidence. VFR. A few lingering showers and storms possible early in the evening. VFR for most terminals. Potential for low stratus and fog/mist for Cape/Islands tonight. Friday...High confidence. VFR. NE winds 5-10 kts. KBOS terminal...Moderate confidence in TAF. Lower confidence in TSRA chances today, but would likely be in the 20-23Z. KBDL terminal...Moderate confidence in TAF. Could see some pop- up showers/t-storms this evening, but confidence is too low to mention in TAF. Outlook /Saturday through Tuesday/... Saturday through Saturday Night: VFR. Sunday: VFR. Breezy. Slight chance SHRA, slight chance TSRA. Sunday Night through Monday: VFR. Breezy. Slight chance SHRA. Monday Night: VFR. Slight chance SHRA. Tuesday: Breezy. Slight chance SHRA. && .MARINE... Forecaster Confidence Levels... Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. High confidence through the period. Winds increase out of the southwest to 10 to 15 knots this afternoon with a slight chance for an afternoon/evening thunderstorm. Storms should diminish shortly after moving out over the waters if they make it that far. Seas remain in the 2-3 foot range. A cold front will cross the coastal waters late tomorrow afternoon resulting in a wind shift to the northwest. Overall quiet conditions over the marine zones for the foreseeable future. Outlook /Saturday through Tuesday/... Saturday through Saturday Night: Winds less than 25 kt. Sunday: Winds less than 25 kt. Slight chance of rain showers. Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers. Monday: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers. Monday Night through Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...None. && SYNOPSIS...McMinn/Mensch NEAR TERM...KJC/McMinn SHORT TERM...KJC/McMinn LONG TERM...Mensch AVIATION...KJC/McMinn/Mensch MARINE...McMinn
The Boston radar (KBOX), 22 km away, was scanning. The volume nearest the first event began at 23:03 UTC.
4 thunderstorm wind, 1 hail. Local standard time, as filed.
In Walpole, a tree and wires were down on South St.
In Stoughton, a tree and wires were down on Kenmore Rd.
In Randolph, a tree was down on a house on Howe Circle.
In Rockland, 1.5 inch hail fell.
In Whitman, two trees were down on Auburn St.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Massachusetts in 2025Every state in 2025This day in weather historyWarnings in Massachusetts, August 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 1274064, 1274065, 1274066, 1274063, 1274067.