Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 7, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at May 26, 2021, 7:45 PM EDT for Hampden County, Hampshire County, Worcester County, Massachusetts; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 26, 2021, 7:45 PM EDT (23:45 UTC)
- Expired
- May 26, 2021, 8:45 PM EDT
- In force
- 60 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Hampden County, MA, Hampshire County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 116 km from the middle of the area, began a volume at 23:45 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 26, 3:56 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 11.8 hours before the alert went out and 129 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
- 6 J/kg
- Mixed-layer CIN
- -291 J/kg
- Mixed-layer LCL
- 1196 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 149 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
908
WUUS51 KBOX 262345
SVRBOX
CTC003-013-015-MAC013-015-027-270045-
/O.NEW.KBOX.SV.W.0007.210526T2345Z-210527T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
745 PM EDT Wed May 26 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Northern Windham County in northern Connecticut...
Northern Tolland County in northern Connecticut...
Northern Hartford County in northern Connecticut...
Southern Worcester County in central Massachusetts...
Southeastern Hampshire County in western Massachusetts...
Southeastern Hampden County in western Massachusetts...
* Until 845 PM EDT.
* At 745 PM EDT, severe thunderstorms were located along a line
extending from Brookfield to Canton, moving east at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Springfield, Enfield, Westfield, Windsor, Agawam, West Springfield,
Simsbury, Ludlow, Bloomfield, Webster, Southbridge, Auburn,
Longmeadow, Suffield, East Longmeadow, Northbridge, Ellington,
Tolland, Wilbraham and Oxford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4197 7302 4209 7273 4225 7217 4213 7155
4188 7206 4190 7291 4197 7289
TIME...MOT...LOC 2344Z 286DEG 27KT 4217 7214 4186 7291
HAIL...<.75IN
WIND...60MPH
$$
BL2 follow-up statements
000
WWUS51 KBOX 270008
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
808 PM EDT Wed May 26 2021
MAC015-270016-
/O.CAN.KBOX.SV.W.0007.000000T0000Z-210527T0045Z/
Hampshire MA-
808 PM EDT Wed May 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HAMPSHIRE COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Connecticut...and western and central Massachusetts.
LAT...LON 4209 7247 4224 7210 4213 7155 4188 7206
4190 7291 4198 7272
TIME...MOT...LOC 0006Z 270DEG 27KT 4213 7193 4182 7270
$$
CTC003-013-015-MAC013-027-270045-
/O.CON.KBOX.SV.W.0007.000000T0000Z-210527T0045Z/
Windham CT-Tolland CT-Hartford CT-Worcester MA-Hampden MA-
808 PM EDT Wed May 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR NORTHERN WINDHAM...NORTHERN TOLLAND...NORTHERN HARTFORD...
SOUTHERN WORCESTER AND SOUTHEASTERN HAMPDEN COUNTIES...
At 806 PM EDT, severe thunderstorms were located along a line
extending from near Charlton to near Bloomfield, moving east at 30
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Enfield, Windsor, Simsbury, Bloomfield, Webster, Southbridge, Auburn,
Longmeadow, Suffield, East Longmeadow, Northbridge, Ellington,
Tolland, Wilbraham, Oxford, Uxbridge, Millbury, Charlton, Windsor
Locks and Palmer.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4209 7247 4224 7210 4213 7155 4188 7206
4190 7291 4198 7272
TIME...MOT...LOC 0006Z 270DEG 27KT 4213 7193 4182 7270
HAIL...<.75IN
WIND...60MPH
$$
BL185
WWUS51 KBOX 270031
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
831 PM EDT Wed May 26 2021
MAC013-270040-
/O.CAN.KBOX.SV.W.0007.000000T0000Z-210527T0045Z/
Hampden MA-
831 PM EDT Wed May 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HAMPDEN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Connecticut...and central Massachusetts.
LAT...LON 4203 7238 4202 7177 4188 7206 4189 7270
4195 7254
TIME...MOT...LOC 0030Z 282DEG 16KT 4216 7197 4178 7249
$$
CTC003-013-015-MAC027-270045-
/O.CON.KBOX.SV.W.0007.000000T0000Z-210527T0045Z/
Windham CT-Tolland CT-Hartford CT-Worcester MA-
831 PM EDT Wed May 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR NORTHERN WINDHAM...NORTHERN TOLLAND...NORTHEASTERN HARTFORD AND
SOUTHERN WORCESTER COUNTIES...
At 831 PM EDT, severe thunderstorms were located along a line
extending from Charlton to Manchester, moving east at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Enfield, Windsor, Ellington, Tolland, Windsor Locks, Stafford,
Somers, East Windsor, Thompson, Douglas, Woodstock, Willington,
Ashford, Pomfret, Eastford and Union.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4203 7238 4202 7177 4188 7206 4189 7270
4195 7254
TIME...MOT...LOC 0030Z 282DEG 16KT 4216 7197 4178 7249
HAIL...<.75IN
WIND...60MPH
$$
BLThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 10:05 PM EDT | Small Craft Advisory | BOX | 12 hr | |
| May 26, 9:51 AM EDT | Small Craft Advisory | BOX | 21 hr | |
| May 26, 5:03 PM EDT | Special Weather Statement | BOX | Franklin | 27 min |
| May 26, 5:30 PM EDT | Special Weather Statement | BOX | Franklin | 45 min |
| May 26, 5:47 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 58 min |
| May 26, 6:13 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Middlesex, Worcester | 62 min |
| May 26, 6:39 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 66 min |
| May 26, 7:05 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 55 min |
| May 26, 7:15 PM EDT | Special Weather Statement | BOX | Essex, Middlesex | 45 min |
| May 26, 7:21 PM EDT | Special Marine Warning | BOX | 54 min | |
| May 26, 7:40 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 65 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2021Severe Thunderstorm Warnings in Connecticut, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.