Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 3, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at May 26, 2021, 6:13 PM EDT for Franklin County, Middlesex County, Worcester County, Massachusetts. It was in force for 62 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, 6:13 PM EDT (22:13 UTC)
- Expired
- May 26, 2021, 7:15 PM EDT
- In force
- 62 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Franklin County, MA, Middlesex County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 101 km from the middle of the area, began a volume at 22:15 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, 10.2 hours before the alert went out and 153 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.
411
WUUS51 KBOX 262213
SVRBOX
MAC011-017-027-262315-
/O.NEW.KBOX.SV.W.0003.210526T2213Z-210526T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
613 PM EDT Wed May 26 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Northern Worcester County in central Massachusetts...
Northwestern Middlesex County in northeastern Massachusetts...
Northeastern Franklin County in western Massachusetts...
* Until 715 PM EDT.
* At 613 PM EDT, severe thunderstorms were located along a line
extending from near Sharon to near Winchendon to near New Salem,
moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Leominster, Fitchburg, Orange, Deerfield, Westford, Gardner, Athol,
Pepperell, Tyngsborough, Groton, Winchendon, Lunenburg, Townsend,
Montague, Lancaster, Templeton, Sterling, Ayer, Westminster and
Shirley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4269 7138 4248 7166 4251 7259 4269 7240
4273 7234
TIME...MOT...LOC 2213Z 264DEG 37KT 4281 7199 4265 7211 4251 7233
HAIL...<.75IN
WIND...60MPH
$$
BL2 follow-up statements
833
WWUS51 KBOX 262231
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
631 PM EDT Wed May 26 2021
MAC011-017-027-262315-
/O.CON.KBOX.SV.W.0003.000000T0000Z-210526T2315Z/
Worcester MA-Middlesex MA-Franklin MA-
631 PM EDT Wed May 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NORTHERN WORCESTER...NORTHWESTERN MIDDLESEX AND EAST CENTRAL
FRANKLIN COUNTIES...
At 631 PM EDT, severe thunderstorms were located along a line
extending from Wilton to near Ashby to near Templeton, moving east at
35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Leominster, Fitchburg, Orange, Westford, Gardner, Athol, Pepperell,
Tyngsborough, Groton, Winchendon, Lunenburg, Townsend, Lancaster,
Templeton, Sterling, Ayer, Westminster, Shirley, Harvard and
Ashburnham.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4269 7138 4248 7166 4251 7244 4264 7233
4273 7225
TIME...MOT...LOC 2231Z 271DEG 32KT 4284 7176 4268 7188 4254 7210
HAIL...<.75IN
WIND...60MPH
$$
BL561
WWUS51 KBOX 262247
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
647 PM EDT Wed May 26 2021
MAC011-017-027-262315-
/O.CON.KBOX.SV.W.0003.000000T0000Z-210526T2315Z/
Worcester MA-Middlesex MA-Franklin MA-
647 PM EDT Wed May 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NORTHERN WORCESTER...NORTHWESTERN MIDDLESEX AND SOUTHEASTERN
FRANKLIN COUNTIES...
At 646 PM EDT, severe thunderstorms were located along a line
extending from Amherst to near Townsend to Westminster, moving east
at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Leominster, Fitchburg, Westford, Gardner, Athol, Pepperell,
Tyngsborough, Groton, Winchendon, Lunenburg, Townsend, Lancaster,
Templeton, Ayer, Westminster, Shirley, Harvard, Ashburnham,
Hubbardston and Princeton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4269 7138 4248 7166 4251 7230 4263 7214
4272 7201
TIME...MOT...LOC 2246Z 268DEG 33KT 4286 7160 4270 7172 4256 7194
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, 6:39 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, 7:45 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.