Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 69, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 14, 2021, 7:46 PM EDT for 4 counties in Massachusetts. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 14, 2021, 7:46 PM EDT (23:46 UTC)
- Expired
- Jul 14, 2021, 8:12 PM EDT
- In force
- 26 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 102 km from the middle of the area, began a volume at 23:50 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.
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 11.8 hours before the alert went out and 135 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.
254 WUUS51 KBOX 142346 SVRBOX MAC011-013-015-027-150045- /O.NEW.KBOX.SV.W.0069.210714T2346Z-210715T0045Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Boston/Norton MA 746 PM EDT Wed Jul 14 2021 The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for... Southwestern Worcester County in central Massachusetts... Southeastern Hampshire County in western Massachusetts... Southeastern Franklin County in western Massachusetts... East central Hampden County in western Massachusetts... * Until 845 PM EDT. * At 746 PM EDT, a severe thunderstorm was located over Ludlow, or near Chicopee, moving east 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... Springfield, Chicopee, Ludlow, South Hadley, Southbridge, Belchertown, Wilbraham, Charlton, Palmer, Spencer, Ware, Sturbridge, Monson, Rutland, Granby, Warren, Paxton, North Brookfield, West Brookfield and Brimfield. 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. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4212 7256 4230 7257 4235 7197 4208 7197 TIME...MOT...LOC 2346Z 269DEG 16KT 4222 7247 HAIL...0.75IN WIND...60MPH $$ RM
1 follow-up statement
832
WWUS51 KBOX 150012
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
812 PM EDT Wed Jul 14 2021
MAC011-013-015-027-150022-
/O.CAN.KBOX.SV.W.0069.000000T0000Z-210715T0045Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
812 PM EDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WORCESTER...
SOUTHEASTERN HAMPSHIRE...SOUTHEASTERN FRANKLIN AND EAST CENTRAL
HAMPDEN COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However heavy rain is
still possible with this thunderstorm.
LAT...LON 4212 7256 4230 7257 4235 7197 4208 7197
TIME...MOT...LOC 0011Z 269DEG 16KT 4222 7231
$$
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, 6:05 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 |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.