Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 92, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 27, 2021, 5:04 PM EDT for Franklin County, Hampden County, Hampshire County, Massachusetts. It was in force for 56 min. 10 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
- Jul 27, 2021, 5:04 PM EDT (21:04 UTC)
- Expired
- Jul 27, 2021, 6:00 PM EDT
- In force
- 56 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA
The radar
The Albany radar (KENX), 112 km from the middle of the area, began a volume at 21:04 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 |
|---|---|---|---|
| Jul 27, 5:18 PM EDT | TSTM WND DMG | Cummington, MA | WIRES DOWN ON MAIN STREET |
| Jul 27, 5:20 PM EDT | TSTM WND DMG | Cummington, MA | TREES AND WIRES DOWN ON PLAINFIELD ROAD |
| Jul 27, 5:23 PM EDT | TSTM WND DMG | Goshen, MA | TREE DOWN ON ROUTE 9. TREE DOWN ON BERKSHIRE TRAIL. RELAYED BY AMATEUR RADIO. |
| Jul 27, 5:31 PM EDT | TSTM WND DMG | Whately, MA | TREE IN DOWN ON HAYDENVILLE ROAD BY WESTBROOK ROAD. TREE DOWN ON I-91 SOUTH. RELAYED BY AMATEUR RADIO. |
| Jul 27, 5:39 PM EDT | TSTM WND DMG | Northampton, MA | TREE DOWN ON WIRES. RELAYED BY AMATEUR RADIO. |
| Jul 27, 5:40 PM EDT | TSTM WND DMG | Hatfield, MA | TREE DOWN ON A CAR ON WEST ST. TREE DOWN ON NORTH STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 5:40 PM EDT | TSTM WND DMG | Hatfield, MA | TREE DOWN AT 90 LINDSEED ROAD. TREE DOWN ON ARNOLD ROAD. RELAYED BY AMATEUR RADIO. |
| Jul 27, 5:45 PM EDT | TSTM WND DMG | Amherst, MA | TREE BRANCHES DOWN ON SOUTH WHITNEY STREET BY COLLEGE STREET, AND ALSO ON EAST PLEASANT STREET BY OWEN DRIVE. WIRES DOWN ON 34 BAKER STREET. RELAYED BY AMATEUR RADIO. |
| Jul 27, 5:46 PM EDT | TSTM WND DMG | Pelham, MA | WIRES DOWN ON AMHERST ROAD NEAR ENFIELD ROAD. RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:06 PM EDT | TSTM WND DMG | Chesterfield, MA | TREE DOWN ON WIRES NEAR 46 BRAY ROAD. RELAYED BY AMATEUR RADIO. |
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 |
|---|---|---|---|
| Jul 27, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 9.1 hours before the alert went out and 97 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1464 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
337
WUUS51 KBOX 272104
SVRBOX
MAC011-013-015-272200-
/O.NEW.KBOX.SV.W.0092.210727T2104Z-210727T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
504 PM EDT Tue Jul 27 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Hampshire County in western Massachusetts...
Central Franklin County in western Massachusetts...
Central Hampden County in western Massachusetts...
* Until 600 PM EDT.
* At 503 PM EDT, a severe thunderstorm was located over East Windsor,
or 15 miles east of Pittsfield, moving southeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated. This storm has downed trees in portions
of central Berkshire County.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
* Locations impacted include...
Springfield, Chicopee, Holyoke, Amherst, Northampton, Deerfield,
Ludlow, South Hadley, Easthampton, Belchertown, Wilbraham, Ware,
Montague, Granby, Southampton, Hadley, Sunderland, Hatfield,
Williamsburg and Huntington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4239 7305 4238 7301 4263 7295 4244 7229
4240 7232 4234 7231 4210 7246 4238 7307
TIME...MOT...LOC 2103Z 299DEG 33KT 4246 7296
HAIL...1.00IN
WIND...60MPH
$$
Loconto/Gaucher3 follow-up statements
003
WWUS51 KBOX 272125
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
525 PM EDT Tue Jul 27 2021
MAC011-013-015-272200-
/O.CON.KBOX.SV.W.0092.000000T0000Z-210727T2200Z/
Hampshire MA-Franklin MA-Hampden MA-
525 PM EDT Tue Jul 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR HAMPSHIRE...CENTRAL FRANKLIN AND CENTRAL HAMPDEN COUNTIES...
At 524 PM EDT, a severe thunderstorm was located over Goshen, or 7
miles northwest of Northampton, moving southeast at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters. At 518 PM, powerline wires were
downed in Cummington from this severe thunderstorm.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Springfield, Chicopee, Holyoke, Amherst, Northampton, Deerfield,
Ludlow, South Hadley, Easthampton, Belchertown, Wilbraham, Ware,
Montague, Granby, Southampton, Hadley, Sunderland, Hatfield,
Williamsburg and Huntington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4239 7305 4238 7301 4263 7295 4244 7229
4240 7232 4234 7231 4210 7246 4238 7307
TIME...MOT...LOC 2124Z 297DEG 30KT 4240 7278
HAIL...1.00IN
WIND...60MPH
$$
Loconto903
WWUS51 KBOX 272140
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
540 PM EDT Tue Jul 27 2021
MAC011-013-015-272200-
/O.CON.KBOX.SV.W.0092.000000T0000Z-210727T2200Z/
Hampshire MA-Franklin MA-Hampden MA-
540 PM EDT Tue Jul 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR HAMPSHIRE...CENTRAL FRANKLIN AND NORTH CENTRAL HAMPDEN
COUNTIES...
At 538 PM EDT, a severe thunderstorm was located over Northampton,
moving southeast at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Trained weather spotters. Trees were reported downed in
Whately and Goshen between 523 and 531 PM. Powerlines were
downed in Cummington at 520 PM.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Holyoke, Amherst, Northampton, Deerfield, Ludlow, South Hadley,
Easthampton, Belchertown, Ware, Montague, Granby, Hadley, Sunderland,
Hatfield, Williamsburg, Buckland, Conway, Leverett, Shutesbury and
Ashfield.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4263 7295 4244 7229 4240 7232 4234 7231
4218 7241 4243 7300
TIME...MOT...LOC 2138Z 299DEG 33KT 4234 7263
HAIL...0.75IN
WIND...60MPH
$$
Loconto366
WWUS51 KBOX 272157
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
557 PM EDT Tue Jul 27 2021
MAC011-013-015-272207-
/O.EXP.KBOX.SV.W.0092.000000T0000Z-210727T2200Z/
Hampshire MA-Franklin MA-Hampden MA-
557 PM EDT Tue Jul 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR HAMPSHIRE...CENTRAL FRANKLIN
AND NORTH CENTRAL HAMPDEN COUNTIES WILL EXPIRE AT 600 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
western and central Massachusetts.
LAT...LON 4263 7295 4244 7229 4240 7232 4234 7231
4218 7241 4243 7300
TIME...MOT...LOC 2157Z 299DEG 33KT 4230 7252
$$
LocontoThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 4:48 PM EDT | Special Weather Statement | BOX | Franklin | 27 min |
| Jul 27, 4:59 PM EDT | Special Weather Statement | BOX | Hampshire | 31 min |
| Jul 27, 5:15 PM EDT | Special Weather Statement | BOX | Franklin | 30 min |
| Jul 27, 5:34 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 56 min |
| Jul 27, 6:01 PM EDT | Special Weather Statement | BOX | Worcester | 29 min |
| Jul 27, 6:33 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex, Norfolk, Plymouth, Suffolk, Worcester | 57 min |
| Jul 27, 6:50 PM EDT | Special Weather Statement | BOX | Essex | 25 min |
| Jul 27, 6:52 PM EDT | Special Marine Warning | BOX | 53 min | |
| Jul 27, 7:01 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 44 min |
| Jul 27, 7:11 PM EDT | Special Marine Warning | BOX | 94 min | |
| Jul 27, 7:26 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more | 64 min |
| Jul 27, 7:39 PM EDT | Special Marine Warning | BOX | 66 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.