Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 50, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 6, 2021, 5:13 PM EDT for 4 counties in Massachusetts. It was in force for 62 min. 6 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 6, 2021, 5:13 PM EDT (21:13 UTC)
- Expired
- Jul 6, 2021, 6:15 PM EDT
- In force
- 62 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Essex County, MA, Middlesex County, MA, Suffolk County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 47 km from the middle of the area, began a volume at 21:12 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, 5:20 PM EDT | TSTM WND DMG | Acton, MA | TREE DOWN ON HOUSE ON JASMINE CIRCLE |
| Jul 6, 5:20 PM EDT | TSTM WND DMG | Acton, MA | TREES AND WIRES DOWN ON MAIN STREET AND ON CENTRAL STREET |
| Jul 6, 5:20 PM EDT | TSTM WND DMG | Acton, MA | TREES DOWN ON POPE ROAD AND RTE 2A |
| Jul 6, 5:30 PM EDT | TSTM WND DMG | Concord, MA | TREE DOWN ON CAR ON ELM STREETAT PARK LANE. TREES DOWN ON LEXINGTON ROAD, NEAR THE CONCORD AND LINCOIN LINE |
| Jul 6, 5:50 PM EDT | TSTM WND DMG | Arlington, MA | MULTIPLE TREES DOWN ACROSS TOWN INCLUDING TREEE DOWN ONTO A CAR ON CLEVELAND STREET |
| Jul 6, 5:56 PM EDT | TSTM WND DMG | Saugus, MA | TREE DOWN ON LINCION 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
Gray, ME (KGYX), launched 12:00Z, 9.2 hours before the alert went out and 181 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
- 47 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
424
WUUS51 KBOX 062113
SVRBOX
MAC009-017-025-027-062215-
/O.NEW.KBOX.SV.W.0050.210706T2113Z-210706T2215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
513 PM EDT Tue Jul 6 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Suffolk County in eastern Massachusetts...
South central Essex County in northeastern Massachusetts...
East central Worcester County in central Massachusetts...
East central Middlesex County in northeastern Massachusetts...
* Until 615 PM EDT.
* At 512 PM EDT, a severe thunderstorm was located over Stow, or near
Marlborough, 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...
Boston, Cambridge, Lynn, Newton, Somerville, Framingham, Waltham,
Malden, Brookline, Medford, Revere, Arlington, Everett, Billerica,
Marlborough, Woburn, Chelsea, Natick, Watertown and Lexington.
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 4247 7089 4246 7094 4243 7093 4245 7094
4245 7097 4241 7099 4233 7089 4238 7105
4233 7101 4232 7101 4233 7102 4233 7103
4228 7104 4225 7111 4233 7125 4232 7132
4229 7132 4235 7168 4257 7154
TIME...MOT...LOC 2112Z 281DEG 26KT 4244 7152
HAIL...0.75IN
WIND...60MPH
$$
Frank1 follow-up statement
368
WWUS51 KBOX 062144
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
544 PM EDT Tue Jul 6 2021
MAC027-062153-
/O.CAN.KBOX.SV.W.0050.000000T0000Z-210706T2215Z/
Worcester MA-
544 PM EDT Tue Jul 6 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WORCESTER COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
eastern and northeastern Massachusetts.
LAT...LON 4237 7133 4252 7129 4249 7103 4247 7089
4246 7094 4243 7093 4245 7094 4245 7097
4241 7099 4233 7089 4238 7105 4233 7101
4232 7101 4233 7102 4233 7103 4228 7104
4227 7105
TIME...MOT...LOC 2143Z 281DEG 26KT 4240 7122
$$
MAC009-017-025-062215-
/O.CON.KBOX.SV.W.0050.000000T0000Z-210706T2215Z/
Suffolk MA-Essex MA-Middlesex MA-
544 PM EDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SUFFOLK...SOUTH CENTRAL ESSEX AND EAST CENTRAL MIDDLESEX
COUNTIES...
At 543 PM EDT, a severe thunderstorm was located over Waltham, 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...
Boston, Cambridge, Lynn, Newton, Somerville, Waltham, Malden,
Brookline, Medford, Revere, Arlington, Everett, Woburn, Chelsea,
Watertown, Lexington, Milton, Melrose, Saugus and Wakefield.
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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4237 7133 4252 7129 4249 7103 4247 7089
4246 7094 4243 7093 4245 7094 4245 7097
4241 7099 4233 7089 4238 7105 4233 7101
4232 7101 4233 7102 4233 7103 4228 7104
4227 7105
TIME...MOT...LOC 2143Z 281DEG 26KT 4240 7122
HAIL...0.75IN
WIND...60MPH
$$
RMThe 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, 5:16 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, 5:21 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 42 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 |
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.