Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 67, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 14, 2021, 6:05 PM EDT for 4 counties in Massachusetts. It was in force for 40 min. 7 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, 6:05 PM EDT (22:05 UTC)
- Expired
- Jul 14, 2021, 6:45 PM EDT
- In force
- 40 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 117 km from the middle of the area, began a volume at 22:08 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, 6:22 PM EDT | HAIL 1.25 | Amherst, MA | HALF DOLLAR SIZE HAIL |
| Jul 14, 6:24 PM EDT | TSTM WND DMG | Shutesbury, MA | TREE DOWN ON MONTAGUE RD |
| Jul 14, 6:25 PM EDT | TSTM WND DMG | Pelham, MA | TREE DOWN BLOCKING ROAD ON ENFIELD ROAD |
| Jul 14, 6:25 PM EDT | HAIL 0.75 | Shutesbury, MA | |
| Jul 14, 6:30 PM EDT | TSTM WND DMG | Amherst, MA | TREE DOWN ACROSS STRONG STREET |
| Jul 14, 6:30 PM EDT | HAIL 1.75 | Pelham, MA | GOLF BALL SIZE HAIL |
| Jul 14, 6:38 PM EDT | TSTM WND DMG | New Salem, MA | TREE DOWN ACROSS DANIEL SHAYS HIGHWAY |
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, 10.1 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
- 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.
282 WUUS51 KBOX 142205 SVRBOX MAC011-013-015-027-142245- /O.NEW.KBOX.SV.W.0067.210714T2205Z-210714T2245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Boston/Norton MA 605 PM EDT Wed Jul 14 2021 The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for... West central Worcester County in central Massachusetts... Southeastern Hampshire County in western Massachusetts... Southeastern Franklin County in western Massachusetts... Northeastern Hampden County in western Massachusetts... * Until 645 PM EDT. * At 605 PM EDT, a severe thunderstorm was located over Leverett, or 7 miles north of Amherst, moving southeast at 15 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to trees and power lines. * Locations impacted include... Amherst, Northampton, South Hadley, Belchertown, Palmer, Ware, Montague, Granby, Barre, Hadley, West Brookfield, Sunderland, Hatfield, Hardwick, Williamsburg, Leverett, Shutesbury, Whately, Pelham and Petersham. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Prepare immediately for hail and damaging winds. People outside should move immediately to shelter inside a strong building. Stay away from windows. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4237 7269 4257 7247 4239 7207 4218 7229 TIME...MOT...LOC 2205Z 308DEG 14KT 4247 7250 HAIL...0.88IN WIND...60MPH $$ RM
1 follow-up statement
900
WWUS51 KBOX 142221
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
621 PM EDT Wed Jul 14 2021
MAC011-013-015-027-142245-
/O.CON.KBOX.SV.W.0067.000000T0000Z-210714T2245Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
621 PM EDT Wed Jul 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR WEST CENTRAL WORCESTER...SOUTHEASTERN HAMPSHIRE...SOUTHEASTERN
FRANKLIN AND NORTHEASTERN HAMPDEN COUNTIES...
At 620 PM EDT, a severe thunderstorm was located over Shutesbury, or
near Amherst, moving southeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Amherst, Belchertown, Palmer, Ware, Granby, Barre, Hadley, West
Brookfield, Hatfield, Hardwick, Leverett, Shutesbury, Pelham,
Petersham, New Braintree, New Salem and Wendell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
This storm has a history of producing hail. SEEK SHELTER NOW inside
a sturdy structure and stay away from windows.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4234 7261 4254 7241 4239 7207 4218 7229
TIME...MOT...LOC 2220Z 308DEG 14KT 4243 7243
HAIL...1.00IN
WIND...60MPH
$$
RMThe 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, 4:53 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Worcester | 52 min |
| Jul 14, 5:30 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 45 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.