Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 39, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 30, 2021, 7:15 PM EDT for Hampden County, Worcester County, Massachusetts; Northeastern Connecticut Planning Region, Connecticut; Providence County, Rhode Island. It was in force for 60 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
- Jun 30, 2021, 7:15 PM EDT (23:15 UTC)
- Expired
- Jun 30, 2021, 8:15 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 Northeastern Connecticut Planning Region, CT, Hampden County, MA, Worcester County, MA, Providence County, RI
The radar
The Boston radar (KBOX), 78 km from the middle of the area, began a volume at 23:17 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 |
|---|---|---|---|
| Jun 30, 7:51 PM EDT | TSTM WND DMG | Woodstock, CT | TREE DOWN ON CHILD ROAD |
| Jun 30, 8:00 PM EDT | TSTM WND DMG | Killingly, CT | WIRES DOWN ON SOAP STREET |
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 |
|---|---|---|---|
| Jun 30, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 11.3 hours before the alert went out and 137 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
- 658 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 1595 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
166 WUUS51 KBOX 302315 SVRBOX CTC013-015-MAC013-027-RIC007-010015- /O.NEW.KBOX.SV.W.0039.210630T2315Z-210701T0015Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Boston/Norton MA 715 PM EDT Wed Jun 30 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... Southeastern Worcester County in central Massachusetts... Southeastern Hampden County in western Massachusetts... Northwestern Providence County in Rhode Island... * Until 815 PM EDT. * At 714 PM EDT, a severe thunderstorm was located near Stafford, or 11 miles north of Mansfield, moving east at 30 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. * Locations impacted include... Vernon, Johnston, Milford, Mansfield, Smithfield, Killingly, Webster, Southbridge, Burrillville, Northbridge, Ellington, Tolland, Wilbraham, Oxford, Uxbridge, Millbury, Charlton, Coventry, Stafford and North Smithfield. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4182 7243 4213 7247 4217 7155 4183 7153 TIME...MOT...LOC 2314Z 275DEG 27KT 4196 7223 HAIL...0.75IN WIND...60MPH $$ Frank
3 follow-up statements
566 WWUS51 KBOX 302331 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 731 PM EDT Wed Jun 30 2021 CTC013-015-MAC013-027-RIC007-010015- /O.CON.KBOX.SV.W.0039.000000T0000Z-210701T0015Z/ Windham CT-Tolland CT-Worcester MA-Hampden MA-Providence RI- 731 PM EDT Wed Jun 30 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT FOR NORTHERN WINDHAM...NORTHERN TOLLAND...SOUTHEASTERN WORCESTER... SOUTHEASTERN HAMPDEN AND NORTHWESTERN PROVIDENCE COUNTIES... At 731 PM EDT, a severe thunderstorm was located over Woodstock, or 14 miles northeast of Mansfield, moving east at 30 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Vernon, Johnston, Milford, Mansfield, Smithfield, Killingly, Webster, Southbridge, Burrillville, Northbridge, Ellington, Tolland, Wilbraham, Oxford, Uxbridge, Millbury, Charlton, Coventry, Stafford and North Smithfield. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4182 7243 4213 7247 4217 7155 4183 7153 TIME...MOT...LOC 2331Z 275DEG 27KT 4195 7205 HAIL...0.75IN WIND...60MPH $$ Frank
832
WWUS51 KBOX 302337
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
737 PM EDT Wed Jun 30 2021
CTC013-015-MAC013-027-RIC007-010015-
/O.CON.KBOX.SV.W.0039.000000T0000Z-210701T0015Z/
Windham CT-Tolland CT-Worcester MA-Hampden MA-Providence RI-
737 PM EDT Wed Jun 30 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR NORTHERN WINDHAM...NORTHERN TOLLAND...SOUTHEASTERN WORCESTER...
SOUTHEASTERN HAMPDEN AND NORTHWESTERN PROVIDENCE COUNTIES...
At 735 PM EDT, a severe thunderstorm was located over Woodstock, or
15 miles northeast of Mansfield, moving east at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated. At 727 PM tree an wires were knocked down
in Ellington, Connecticut. At 732 PM, there was a tree down
on 27 Sturbridge Road.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Vernon, Johnston, Milford, Mansfield, Smithfield, Killingly, Webster,
Southbridge, Burrillville, Northbridge, Ellington, Tolland,
Wilbraham, Oxford, Uxbridge, Millbury, Charlton, Coventry, Stafford
and North Smithfield.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4182 7243 4213 7247 4217 7155 4183 7153
TIME...MOT...LOC 2335Z 275DEG 27KT 4195 7201
HAIL...0.75IN
WIND...60MPH
$$
Frank700 WWUS51 KBOX 302357 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 757 PM EDT Wed Jun 30 2021 CTC013-015-MAC013-027-RIC007-010015- /O.CON.KBOX.SV.W.0039.000000T0000Z-210701T0015Z/ Windham CT-Tolland CT-Worcester MA-Hampden MA-Providence RI- 757 PM EDT Wed Jun 30 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT FOR NORTHERN WINDHAM...NORTHERN TOLLAND...SOUTHEASTERN WORCESTER... SOUTHEASTERN HAMPDEN AND NORTHWESTERN PROVIDENCE COUNTIES... At 757 PM EDT, a severe thunderstorm was located near Putnam, or 15 miles west of Woonsocket, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Vernon, Johnston, Milford, Mansfield, Smithfield, Killingly, Webster, Southbridge, Burrillville, Northbridge, Ellington, Tolland, Wilbraham, Oxford, Uxbridge, Millbury, Charlton, Coventry, Stafford and North Smithfield. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4182 7243 4213 7247 4217 7155 4183 7153 TIME...MOT...LOC 2357Z 275DEG 27KT 4194 7179 HAIL...<.75IN WIND...60MPH $$ Frank
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 2:29 AM EDT | Small Craft Advisory | BOX | 18 hr | |
| Jun 30, 3:40 PM EDT | Special Weather Statement | BOX | Hampshire | 65 min |
| Jun 30, 3:42 PM EDT | Special Weather Statement | BOX | Franklin | 63 min |
| Jun 30, 3:48 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 57 min |
| Jun 30, 4:03 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire | 57 min |
| Jun 30, 4:32 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Middlesex, Worcester | 58 min |
| Jun 30, 4:39 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 66 min |
| Jun 30, 4:45 PM EDT | Tornado Warning | BOX | Franklin, Worcester | 26 min |
| Jun 30, 5:00 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 30 min |
| Jun 30, 5:13 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 62 min |
| Jun 30, 5:25 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 49 min |
| Jun 30, 5:26 PM EDT | Special Marine Warning | BOX | 64 min | |
| Jun 30, 5:29 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 44 min |
| Jun 30, 5:43 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 51 min |
| Jun 30, 5:54 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Suffolk, Worcester | 53 min |
| Jun 30, 5:58 PM EDT | Special Marine Warning | BOX | 62 min | |
| Jun 30, 6:11 PM EDT | Special Weather Statement | BOX | Norfolk | 49 min |
| Jun 30, 6:12 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Plymouth, Suffolk, Worcester | 47 min |
| Jun 30, 6:22 PM EDT | Special Marine Warning | BOX | 53 min | |
| Jun 30, 6:31 PM EDT | Special Marine Warning | BOX | 59 min | |
| Jun 30, 6:45 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 60 min |
| Jun 30, 6:57 PM EDT | Special Marine Warning | BOX | 33 min | |
| Jun 29, 8:23 PM EDT | Special Weather Statement | BOX | 52 min | |
| Jun 29, 8:25 PM EDT | Special Weather Statement | BOX | 50 min | |
| Jun 30, 6:39 PM EDT | Special Weather Statement | BOX | 51 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2021Severe Thunderstorm Warnings in Connecticut, 2021Severe Thunderstorm Warnings in Rhode Island, 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.