Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 51, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 6, 2021, 5:21 PM EDT for Middlesex County, Norfolk County, Worcester County, Massachusetts; Providence County, Rhode Island; Northeastern Connecticut Planning Region, Connecticut. It was in force for 42 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
- Jul 6, 2021, 5:21 PM EDT (21:21 UTC)
- Expired
- Jul 6, 2021, 6:03 PM EDT
- In force
- 42 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, Middlesex County, MA, Norfolk County, MA, Worcester County, MA, Providence County, RI
The radar
The Boston radar (KBOX), 57 km from the middle of the area, began a volume at 21:23 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 6, 5:40 PM EDT | TSTM WND DMG | Dudley, MA | TREE DOWN ON CHASE 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 6, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.4 hours before the alert went out and 150 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
- 230 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 1202 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 184 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
054 WUUS51 KBOX 062121 SVRBOX CTC015-MAC017-021-027-RIC007-062215- /O.NEW.KBOX.SV.W.0051.210706T2121Z-210706T2215Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Boston/Norton MA 521 PM EDT Tue Jul 6 2021 The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for... Northeastern Windham County in northern Connecticut... West central Norfolk County in eastern Massachusetts... Southeastern Worcester County in central Massachusetts... South central Middlesex County in northeastern Massachusetts... Providence County in Rhode Island... * Until 615 PM EDT. * At 521 PM EDT, a severe thunderstorm was located over Dudley, or 16 miles southwest of Worcester, 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... Worcester, Cranston, Framingham, Woonsocket, Shrewsbury, Cumberland, North Providence, Johnston, Milford, Plainfield, Smithfield, Lincoln, Westborough, Grafton, Killingly, Webster, Southbridge, Ashland, Bellingham and Auburn. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4174 7210 4229 7203 4230 7142 4175 7150 TIME...MOT...LOC 2121Z 281DEG 26KT 4205 7194 HAIL...0.75IN WIND...60MPH $$ Frank
2 follow-up statements
773 WWUS51 KBOX 062147 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 547 PM EDT Tue Jul 6 2021 CTC015-MAC017-021-027-RIC007-062215- /O.CON.KBOX.SV.W.0051.000000T0000Z-210706T2215Z/ Windham CT-Norfolk MA-Worcester MA-Middlesex MA-Providence RI- 547 PM EDT Tue Jul 6 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT FOR NORTHEASTERN WINDHAM...WEST CENTRAL NORFOLK...SOUTHEASTERN WORCESTER...SOUTH CENTRAL MIDDLESEX AND PROVIDENCE COUNTIES... At 546 PM EDT, a severe thunderstorm was located near Douglas, or 11 miles west of Woonsocket, moving east at 30 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Cranston, Framingham, Woonsocket, Cumberland, North Providence, Johnston, Milford, Plainfield, Smithfield, Lincoln, Grafton, Killingly, Webster, Southbridge, Ashland, Bellingham, Burrillville, Northbridge, Hopkinton and Oxford. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. && LAT...LON 4174 7210 4206 7205 4230 7142 4175 7150 TIME...MOT...LOC 2146Z 281DEG 26KT 4202 7171 HAIL...0.75IN WIND...60MPH $$ RM
118
WWUS51 KBOX 062203
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
603 PM EDT Tue Jul 6 2021
CTC015-MAC017-021-027-RIC007-062212-
/O.CAN.KBOX.SV.W.0051.000000T0000Z-210706T2215Z/
Windham CT-Norfolk MA-Worcester MA-Middlesex MA-Providence RI-
603 PM EDT Tue Jul 6 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WINDHAM...WEST
CENTRAL NORFOLK...SOUTHEASTERN WORCESTER...SOUTH CENTRAL MIDDLESEX
AND PROVIDENCE COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning remains severe
and a new Severe Thunderstorm Warning has been issued until 645 PM
for Providence and Windham Counties. Therefore, the original warning
has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northern Connecticut...eastern, central and northeastern
Massachusetts...and Rhode Island.
Remember, a Severe Thunderstorm Warning still remains in effect for
Providence and Windham Counties until 645 PM.
LAT...LON 4174 7210 4206 7205 4230 7142 4175 7150
TIME...MOT...LOC 2154Z 281DEG 26KT 4200 7156
$$
LocontoThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 1:42 AM EDT | Special Weather Statement | BOX | Franklin | 33 min |
| Jul 6, 1:57 AM EDT | Special Weather Statement | BOX | Franklin | 33 min |
| Jul 6, 2:20 AM EDT | Special Weather Statement | BOX | Franklin | 25 min |
| Jul 6, 2:34 AM EDT | Special Weather Statement | BOX | Worcester | 41 min |
| Jul 6, 3:33 AM EDT | Heat Advisory | BOX | Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 4 more | 39 hr |
| Jul 6, 2:14 PM EDT | Special Weather Statement | BOX | Franklin | 46 min |
| Jul 6, 3:02 PM EDT | Special Weather Statement | BOX | Hampshire | 43 min |
| Jul 6, 3:06 PM EDT | Special Weather Statement | BOX | Hampden | 39 min |
| Jul 6, 3:12 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 63 min |
| Jul 6, 3:36 PM EDT | Special Weather Statement | BOX | Hampden | 39 min |
| Jul 6, 3:49 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 56 min |
| Jul 6, 4:13 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 40 min |
| Jul 6, 4:20 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Hampshire | 55 min |
| Jul 6, 4:42 PM EDT | Special Weather Statement | BOX | Middlesex, Worcester | 48 min |
| Jul 6, 4:43 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 62 min |
| Jul 6, 4:51 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 33 min |
| Jul 6, 5:13 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex, Suffolk, Worcester | 62 min |
| Jul 6, 5:16 PM EDT | Special Marine Warning | BOX | 44 min | |
| Jul 6, 5:19 PM EDT | Special Weather Statement | BOX | Essex | 41 min |
| Jul 6, 5:21 PM EDT | Special Marine Warning | BOX | 39 min | |
| Jul 6, 5:52 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Worcester | 53 min |
| Jul 6, 5:54 PM EDT | Special Marine Warning | BOX | 66 min | |
| Jul 6, 5:57 PM EDT | Special Marine Warning | BOX | 48 min | |
| Jul 6, 6:00 PM EDT | Special Weather Statement | BOX | Essex | 30 min |
| Jul 6, 6:07 PM EDT | Special Marine Warning | BOX | 23 min | |
| Jul 6, 6:13 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Suffolk | 31 min |
| Jul 6, 6:37 PM EDT | Special Marine Warning | BOX | 23 min | |
| Jul 6, 6:45 PM EDT | Special Weather Statement | BOX | Bristol, Plymouth | 45 min |
| Jul 6, 6:52 PM EDT | Special Marine Warning | BOX | 53 min | |
| Jul 6, 6:58 PM EDT | Special Weather Statement | BOX | Washington | 32 min |
| Jul 6, 5:00 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region, Northeastern Connecticut Planning Region | 60 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2021Severe Thunderstorm Warnings in Rhode Island, 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.