Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 4, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at May 26, 2021, 6:39 PM EDT for 4 counties in Massachusetts. It was in force for 66 min. 2 reports 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 26, 2021, 6:39 PM EDT (22:39 UTC)
- Expired
- May 26, 2021, 7:45 PM EDT
- In force
- 66 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 82 km from the middle of the area, began a volume at 22:40 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 26, 6:39 PM EDT | TSTM WND DMG | Pelham, MA | TREE DOWN ON AMHERST ROAD |
| May 26, 7:20 PM EDT | TSTM WND DMG | Springfield, MA | MULTIPLE TREES DOWN ON NORTH BRANCH PARKWAY |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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, 10.7 hours before the alert went out and 155 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.
322
WUUS51 KBOX 262239
SVRBOX
MAC011-013-015-027-262345-
/O.NEW.KBOX.SV.W.0004.210526T2239Z-210526T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
639 PM EDT Wed May 26 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Central Worcester County in central Massachusetts...
Southeastern Hampshire County in western Massachusetts...
Southeastern Franklin County in western Massachusetts...
Central Hampden County in western Massachusetts...
* Until 745 PM EDT.
* At 638 PM EDT, severe thunderstorms were located along a line
extending from near Templeton to near South Hadley, moving east at
30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Worcester, Springfield, Chicopee, Westfield, Leominster, Holyoke,
Amherst, Shrewsbury, Northampton, West Springfield, Ludlow, South
Hadley, Holden, Southbridge, Auburn, Easthampton, Belchertown,
Wilbraham, Northborough and Oxford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4248 7156 4231 7166 4205 7198 4216 7293
4251 7230
TIME...MOT...LOC 2238Z 274DEG 25KT 4252 7209 4223 7255
HAIL...<.75IN
WIND...60MPH
$$
BL2 follow-up statements
523
WWUS51 KBOX 262250
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
650 PM EDT Wed May 26 2021
MAC011-013-015-027-262345-
/O.CON.KBOX.SV.W.0004.000000T0000Z-210526T2345Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
650 PM EDT Wed May 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR CENTRAL WORCESTER...SOUTHEASTERN HAMPSHIRE...SOUTHEASTERN
FRANKLIN AND CENTRAL HAMPDEN COUNTIES...
At 648 PM EDT, severe thunderstorms were located along a line
extending from Hubbardston to near Granby, moving east at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Trained weather spotters. At 640 PM EDT trees down in
Pelham, MA on Amherst and Jones Roads.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Worcester, Springfield, Chicopee, Westfield, Leominster, Holyoke,
Amherst, Shrewsbury, Northampton, West Springfield, Ludlow, South
Hadley, Holden, Southbridge, Auburn, Easthampton, Belchertown,
Wilbraham, Northborough and Oxford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4248 7156 4231 7166 4205 7198 4216 7293
4251 7230
TIME...MOT...LOC 2248Z 274DEG 25KT 4252 7200 4223 7246
HAIL...<.75IN
WIND...60MPH
$$
FN377
WWUS51 KBOX 262326
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
726 PM EDT Wed May 26 2021
MAC011-262335-
/O.CAN.KBOX.SV.W.0004.000000T0000Z-210526T2345Z/
Franklin MA-
726 PM EDT Wed May 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FRANKLIN COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
western and central Massachusetts.
LAT...LON 4216 7293 4219 7273 4231 7235 4250 7197
4248 7156 4231 7166 4205 7198
TIME...MOT...LOC 2325Z 254DEG 31KT 4248 7167 4211 7234
$$
MAC013-015-027-262345-
/O.CON.KBOX.SV.W.0004.000000T0000Z-210526T2345Z/
Worcester MA-Hampshire MA-Hampden MA-
726 PM EDT Wed May 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR CENTRAL WORCESTER...SOUTHEASTERN HAMPSHIRE AND CENTRAL HAMPDEN
COUNTIES...
At 725 PM EDT, severe thunderstorms were located along a line
extending from Lancaster to Monson, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Trained weather spotters.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Worcester, Springfield, Chicopee, Westfield, Leominster, Holyoke,
Shrewsbury, West Springfield, Ludlow, South Hadley, Holden,
Southbridge, Auburn, Belchertown, Wilbraham, Northborough, Oxford,
Clinton, Millbury and Charlton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4216 7293 4219 7273 4231 7235 4250 7197
4248 7156 4231 7166 4205 7198
TIME...MOT...LOC 2325Z 254DEG 31KT 4248 7167 4211 7234
HAIL...<.75IN
WIND...60MPH
$$
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, 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, 7:45 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire, Worcester | 60 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.