Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 65, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 14, 2021, 4:53 PM EDT for Franklin County, Worcester County, Massachusetts. It was in force for 52 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 14, 2021, 4:53 PM EDT (20:53 UTC)
- Expired
- Jul 14, 2021, 5:45 PM EDT
- In force
- 52 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Franklin County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 126 km from the middle of the area, began a volume at 20:56 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 14, 5:23 PM EDT | TSTM WND DMG | Northfield, MA | TREE DOWN ON PINE MEADOW ROAD NEAR THE S CURVES |
| Jul 14, 5:36 PM EDT | HAIL 0.88 | Erving, MA | NICKEL SIZE HAIL |
| Jul 14, 5:40 PM EDT | HAIL 1 | Erving, MA | QUARTER SIZE HAIL |
| Jul 14, 5:45 PM EDT | TSTM WND DMG | Erving, MA | TREE AND WIRES DOWN ON WELLS STREET AND STATE ROAD. |
| Jul 14, 5:45 PM EDT | TSTM WND DMG | Gill, MA | TREE DOWN ON MUNNS FERRY ROAD |
| Jul 14, 5:50 PM EDT | TSTM WND DMG | Wendell, MA | TREE AND LINES DOWN ON MONTAGUE ROAD AND MORMON HOLLOW ROAD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 8.9 hours before the alert went out and 121 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
- 20 J/kg
- Mixed-layer CIN
- -211 J/kg
- Mixed-layer LCL
- 871 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
148
WUUS51 KBOX 142053
SVRBOX
MAC011-027-142145-
/O.NEW.KBOX.SV.W.0065.210714T2053Z-210714T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
453 PM EDT Wed Jul 14 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Northwestern Worcester County in central Massachusetts...
Northeastern Franklin County in western Massachusetts...
* Until 545 PM EDT.
* At 452 PM EDT, a severe thunderstorm was located over Bernardston,
or 8 miles north of Greenfield, moving southeast at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Greenfield, Orange, Athol, Winchendon, Montague, Northfield,
Bernardston, Shelburne, Erving, Phillipston, Colrain, Gill,
Royalston, Petersham, New Salem, Wendell, Warwick and Leyden.
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 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 4272 7218 4269 7208 4245 7225 4264 7273
4273 7266
TIME...MOT...LOC 2052Z 298DEG 18KT 4273 7255
HAIL...0.75IN
WIND...60MPH
$$
RM2 follow-up statements
448
WWUS51 KBOX 142118
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
518 PM EDT Wed Jul 14 2021
MAC011-027-142145-
/O.CON.KBOX.SV.W.0065.000000T0000Z-210714T2145Z/
Worcester MA-Franklin MA-
518 PM EDT Wed Jul 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHWESTERN WORCESTER AND NORTHEASTERN FRANKLIN COUNTIES...
At 517 PM EDT, a severe thunderstorm was located over Northfield, or
7 miles northwest of Orange, moving southeast at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Greenfield, Orange, Athol, Winchendon, Montague, Northfield,
Bernardston, Shelburne, Erving, Phillipston, Colrain, Gill,
Royalston, Petersham, New Salem, Wendell, Warwick and Leyden.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This storm is producing hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4272 7218 4269 7208 4245 7225 4264 7273
4273 7266
TIME...MOT...LOC 2117Z 298DEG 18KT 4267 7240
HAIL...0.75IN
WIND...60MPH
$$
RM638 WWUS51 KBOX 142123 SVSBOX Severe Weather Statement National Weather Service Boston/Norton MA 523 PM EDT Wed Jul 14 2021 MAC011-027-142145- /O.CON.KBOX.SV.W.0065.000000T0000Z-210714T2145Z/ Worcester MA-Franklin MA- 523 PM EDT Wed Jul 14 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR NORTHWESTERN WORCESTER AND NORTHEASTERN FRANKLIN COUNTIES... At 523 PM EDT, a severe thunderstorm was located over Warwick, or near Orange, moving southeast at 20 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. Locations impacted include... Greenfield, Orange, Athol, Winchendon, Montague, Northfield, Bernardston, Erving, Phillipston, Gill, Royalston, Petersham, New Salem, Wendell and Warwick. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. This storm is producing pea sized to half inch hail. SEEK SHELTER NOW inside a sturdy structure and stay away from windows. 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 4260 7261 4272 7249 4268 7209 4245 7225 TIME...MOT...LOC 2123Z 298DEG 18KT 4266 7236 HAIL...0.75IN WIND...60MPH $$ RM
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 12:32 AM EDT | Dense Fog Advisory | BOX | Barnstable, Bristol, Dukes, Essex, Middlesex, Nantucket and 4 more | 9 hr |
| Jul 14, 3:36 AM EDT | Special Weather Statement | BOX | Hampden, Hampshire | 39 min |
| Jul 14, 4:15 AM EDT | Special Weather Statement | BOX | Hampden, Hampshire | 45 min |
| Jul 14, 4:46 PM EDT | Special Weather Statement | BOX | Worcester | 44 min |
| Jul 14, 5:30 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 45 min |
| Jul 14, 6:05 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 40 min |
| Jul 14, 6:38 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 52 min |
| Jul 14, 7:16 PM EDT | Flash Flood Warning | BOX | Hampshire | 53 min |
| Jul 14, 7:31 PM EDT | Special Weather Statement | BOX | Worcester | 44 min |
| Jul 14, 7:33 PM EDT | Special Weather Statement | BOX | Hampden | 42 min |
| Jul 14, 7:46 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 26 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.