Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 93, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 27, 2021, 5:34 PM EDT for Capitol Planning Region, Connecticut; Franklin County, Hampden County, Hampshire County, Massachusetts. It was in force for 56 min. 8 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, 5:34 PM EDT (21:34 UTC)
- Expired
- Jul 27, 2021, 6:30 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 Capitol Planning Region, CT, Franklin County, MA, Hampden County, MA, Hampshire County, MA
The radar
The Albany radar (KENX), 103 km from the middle of the area, began a volume at 21:34 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, 5:39 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, 6:06 PM EDT | TSTM WND DMG | Chesterfield, MA | TREE DOWN ON WIRES NEAR 46 BRAY ROAD. RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:13 PM EDT | TSTM WND DMG | Russell, MA | TREE DOWN NEAR 185 HUNTINGTON ROAD (ROUTE 20). RELAYED BY AMATEUR RADIO. |
| Jul 27, 6:25 PM EDT | TSTM WND DMG | 4 E Sandsfield, MA | TREE DOWNED ACROSS ROUTE 8 |
| Jul 27, 6:28 PM EDT | TSTM WND DMG | Agawam, MA | WIRES DOWN NEAR 1004 NORTH WEST STREET. |
| Jul 27, 6:28 PM EDT | TSTM WND DMG | West Springfield, MA | UTILITY POLE DOWN ON ROUTE 20 AT DEWEY STREET. TREE DOWN ON WIRES BIRNIE AVE. |
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, 9.6 hours before the alert went out and 92 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.
590
WUUS51 KBOX 272134
SVRBOX
CTC003-MAC011-013-015-272230-
/O.NEW.KBOX.SV.W.0093.210727T2134Z-210727T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
534 PM EDT Tue Jul 27 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Northern Hartford County in northern Connecticut...
Hampshire County in western Massachusetts...
South central Franklin County in western Massachusetts...
Hampden County in western Massachusetts...
* Until 630 PM EDT.
* At 534 PM EDT, severe thunderstorms were located along a line
extending from near Cheshire to near Lee to Sheffield, moving
southeast at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
* Locations impacted include...
Springfield, Chicopee, Enfield, Westfield, Holyoke, Amherst,
Northampton, Agawam, West Springfield, Ludlow, South Hadley,
Easthampton, Longmeadow, Suffield, East Longmeadow, Belchertown,
Wilbraham, Windsor Locks, Somers and East Windsor.
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 these storms. 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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4215 7307 4214 7305 4215 7303 4231 7300
4231 7303 4233 7306 4238 7307 4238 7301
4250 7298 4232 7235 4208 7249 4191 7253
4199 7303 4204 7301 4204 7306
TIME...MOT...LOC 2134Z 293DEG 31KT 4252 7316 4231 7317 4213 7334
HAIL...1.00IN
WIND...60MPH
$$
Loconto/Gaucher2 follow-up statements
344
WWUS51 KBOX 272211
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
611 PM EDT Tue Jul 27 2021
CTC003-MAC011-013-015-272230-
/O.CON.KBOX.SV.W.0093.000000T0000Z-210727T2230Z/
Hartford CT-Hampshire MA-Franklin MA-Hampden MA-
611 PM EDT Tue Jul 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHERN HARTFORD...HAMPSHIRE...SOUTH CENTRAL FRANKLIN AND
HAMPDEN COUNTIES...
At 610 PM EDT, severe thunderstorms were located along a line
extending from near Cummington to near Montgomery to near Tolland,
moving southeast at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Springfield, Chicopee, Enfield, Westfield, Holyoke, Amherst,
Northampton, Agawam, West Springfield, Ludlow, South Hadley,
Easthampton, Longmeadow, Suffield, East Longmeadow, Belchertown,
Wilbraham, Windsor Locks, Somers and East Windsor.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4215 7307 4214 7305 4215 7303 4231 7300
4231 7303 4233 7306 4238 7307 4238 7301
4250 7298 4232 7235 4208 7249 4191 7253
4199 7303 4204 7301 4204 7306
TIME...MOT...LOC 2210Z 293DEG 31KT 4243 7288 4222 7289 4204 7306
HAIL...1.00IN
WIND...60MPH
$$
Loconto949
WWUS51 KBOX 272226
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
626 PM EDT Tue Jul 27 2021
CTC003-MAC011-013-015-272236-
/O.EXP.KBOX.SV.W.0093.000000T0000Z-210727T2230Z/
Hartford CT-Hampshire MA-Franklin MA-Hampden MA-
626 PM EDT Tue Jul 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN HARTFORD...
HAMPSHIRE...SOUTH CENTRAL FRANKLIN AND HAMPDEN COUNTIES WILL EXPIRE
AT 630 PM EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northern Connecticut...and western Massachusetts.
LAT...LON 4215 7307 4214 7305 4215 7303 4231 7300
4231 7303 4233 7306 4238 7307 4238 7301
4250 7298 4232 7235 4208 7249 4191 7253
4199 7303 4204 7301 4204 7306
TIME...MOT...LOC 2226Z 293DEG 31KT 4243 7288 4222 7289 4204 7306
$$
Gaucher/LocontoThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 6:27 PM EDT | Special Weather Statement | BOX | 48 min | |
| Jul 27, 6:53 PM EDT | Special Weather Statement | BOX | 37 min | |
| Jul 27, 7:01 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 44 min |
| Jul 27, 7:21 PM EDT | Special Weather Statement | BOX | 39 min | |
| 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, 5:04 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 56 min |
| Jul 27, 5:15 PM EDT | Special Weather Statement | BOX | Franklin | 30 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, 7:11 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.