Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 38, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 30, 2021, 6:45 PM EDT for Hampden County, Massachusetts; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 60 min. 1 report 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, 6:45 PM EDT (22:45 UTC)
- Expired
- Jun 30, 2021, 7:45 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 Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Hampden County, MA
The radar
The Boston radar (KBOX), 119 km from the middle of the area, began a volume at 22:47 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, 7:27 PM EDT | TSTM WND DMG | Ellington, CT | TREE DOWN ON WIRES ON MAPLE 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, 10.8 hours before the alert went out and 119 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.
083 WUUS51 KBOX 302245 SVRBOX CTC003-013-015-MAC013-302345- /O.NEW.KBOX.SV.W.0038.210630T2245Z-210630T2345Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Boston/Norton MA 645 PM EDT Wed Jun 30 2021 The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for... Northwestern Windham County in northern Connecticut... Tolland County in northern Connecticut... Northeastern Hartford County in northern Connecticut... Southeastern Hampden County in western Massachusetts... * Until 745 PM EDT. * At 644 PM EDT, a severe thunderstorm was located over East Windsor, or near South Windsor, 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... Springfield, Manchester, Enfield, Vernon, Windsor, Agawam, Mansfield, South Windsor, Simsbury, Bloomfield, Avon, Longmeadow, Suffield, East Longmeadow, Ellington, Tolland, Windsor Locks, Coventry, Stafford and Somers. 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 4181 7285 4203 7284 4212 7218 4180 7213 TIME...MOT...LOC 2244Z 276DEG 28KT 4191 7258 HAIL...0.75IN WIND...60MPH $$ Frank
2 follow-up statements
866 WWUS51 KBOX 302254 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 654 PM EDT Wed Jun 30 2021 CTC003-013-015-MAC013-302345- /O.CON.KBOX.SV.W.0038.000000T0000Z-210630T2345Z/ Windham CT-Tolland CT-Hartford CT-Hampden MA- 654 PM EDT Wed Jun 30 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR NORTHWESTERN WINDHAM...TOLLAND...NORTHEASTERN HARTFORD AND SOUTHEASTERN HAMPDEN COUNTIES... At 654 PM EDT, a severe thunderstorm was located over East Windsor, or near Enfield, moving east at 25 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Springfield, Manchester, Enfield, Vernon, Windsor, Agawam, Mansfield, South Windsor, Simsbury, Bloomfield, Avon, Longmeadow, Suffield, East Longmeadow, Ellington, Tolland, Windsor Locks, Coventry, Stafford and Somers. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4181 7285 4203 7284 4212 7218 4180 7213 TIME...MOT...LOC 2254Z 261DEG 20KT 4191 7255 HAIL...0.75IN WIND...60MPH $$ Frank
373 WWUS51 KBOX 302312 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 712 PM EDT Wed Jun 30 2021 CTC003-013-015-MAC013-302345- /O.CON.KBOX.SV.W.0038.000000T0000Z-210630T2345Z/ Windham CT-Tolland CT-Hartford CT-Hampden MA- 712 PM EDT Wed Jun 30 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR NORTHWESTERN WINDHAM...TOLLAND...NORTHEASTERN HARTFORD AND SOUTHEASTERN HAMPDEN COUNTIES... At 712 PM EDT, a severe thunderstorm was located over Tolland, or near Vernon, 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... Springfield, Manchester, Enfield, Vernon, Windsor, Agawam, Mansfield, South Windsor, Bloomfield, Longmeadow, Suffield, East Longmeadow, Ellington, Tolland, Windsor Locks, Coventry, Stafford, Somers, East Windsor and Southwick. 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 4181 7272 4205 7273 4212 7218 4180 7213 TIME...MOT...LOC 2312Z 276DEG 28KT 4190 7236 HAIL...0.75IN 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, 6:57 PM EDT | Special Marine Warning | BOX | 33 min | |
| Jun 30, 7:15 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 60 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 Connecticut, 2021Severe 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.