Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 13, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at May 19, 2026, 6:25 PM EDT for Bristol County, Norfolk County, Plymouth County, Massachusetts. It was in force for 29 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 19, 2026, 6:25 PM EDT (22:25 UTC)
- Expired
- May 19, 2026, 6:54 PM EDT
- In force
- 29 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bristol County, MA, Norfolk County, MA, Plymouth County, MA
The radar
The Boston radar (KBOX), 11 km from the middle of the area, began a volume at 22:25 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 19, 6:25 PM EDT | TSTM WND DMG | 1 Nnw Norfolk, MA | In Norfolk, wires were down on Cleveland St. Relayed by amateur radio. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.4 hours before the alert went out and 192 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 210 J/kg
- Mixed-layer CIN
- -352 J/kg
- Mixed-layer LCL
- 1538 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 144 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
721 WUUS51 KBOX 192225 SVRBOX MAC005-021-023-192315- /O.NEW.KBOX.SV.W.0013.260519T2225Z-260519T2315Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Boston/Norton MA 625 PM EDT Tue May 19 2026 The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for... Southern Norfolk County in eastern Massachusetts... West central Plymouth County in southeastern Massachusetts... Northwestern Bristol County in southeastern Massachusetts... * Until 715 PM EDT. * At 625 PM EDT, a severe thunderstorm was located over Foxborough, or 7 miles east of Franklin, moving east at 50 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. * Locations impacted include... Brockton, Taunton, Weymouth, Randolph, Franklin, North Attleborough, Norwood, Stoughton, Bridgewater, Walpole, Mansfield, Easton, Canton, Norton, Sharon, Rockland, Foxborough, Abington, Whitman, and Hanover. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4200 7138 4218 7137 4213 7084 4194 7095 TIME...MOT...LOC 2225Z 275DEG 43KT 4208 7127 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ FT
2 follow-up statements
731 WWUS51 KBOX 192249 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 649 PM EDT Tue May 19 2026 MAC005-021-023-192315- /O.CON.KBOX.SV.W.0013.000000T0000Z-260519T2315Z/ Norfolk MA-Plymouth MA-Bristol MA- 649 PM EDT Tue May 19 2026 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT FOR EASTERN NORFOLK...WEST CENTRAL PLYMOUTH AND NORTHERN BRISTOL COUNTIES... At 649 PM EDT, a severe thunderstorm was located over Hanson, or 7 miles northeast of Bridgewater, moving east at 50 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Brockton, Stoughton, Bridgewater, Easton, Rockland, Abington, Whitman, Hanover, East Bridgewater, Holbrook, Hanson, West Bridgewater, and Avon. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4198 7106 4214 7110 4213 7084 4194 7095 TIME...MOT...LOC 2249Z 275DEG 43KT 4205 7088 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ FT
838 WWUS51 KBOX 192254 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 654 PM EDT Tue May 19 2026 MAC005-021-023-192304- /O.CAN.KBOX.SV.W.0013.000000T0000Z-260519T2315Z/ Norfolk MA-Plymouth MA-Bristol MA- 654 PM EDT Tue May 19 2026 ...THE SEVERE THUNDERSTORM WARNING FOR EASTERN NORFOLK...WEST CENTRAL PLYMOUTH AND NORTHERN BRISTOL COUNTIES IS CANCELLED... The storm which prompted the warning has weakened below severe limits, however, dangerous cloud to ground lightning still remains possible with this storm. LAT...LON 4198 7106 4214 7110 4213 7084 4194 7095 TIME...MOT...LOC 2252Z 275DEG 43KT 4204 7080 $$ FT
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 5:02 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 39 min |
| May 19, 5:15 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 60 min |
| May 19, 5:47 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 30 min |
| May 19, 5:51 PM EDT | Special Marine Warning | BOX | 54 min | |
| May 19, 5:51 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 26 min |
| May 19, 6:05 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Plymouth, Suffolk | 27 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2026Every severe thunderstorm warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.