Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 45, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 6, 2021, 4:13 PM EDT for 4 counties in Massachusetts. It was in force for 40 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 6, 2021, 4:13 PM EDT (20:13 UTC)
- Expired
- Jul 6, 2021, 4:53 PM EDT
- In force
- 40 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 Albany radar (KENX), 123 km from the middle of the area, began a volume at 20:12 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.
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
Albany, NY (KALY), launched 12:00Z, 8.2 hours before the alert went out and 109 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
- 326 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 941 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
362 WUUS51 KBOX 062013 SVRBOX MAC011-013-015-027-062115- /O.NEW.KBOX.SV.W.0045.210706T2013Z-210706T2115Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Boston/Norton MA 413 PM EDT Tue Jul 6 2021 The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for... West central Worcester County in central Massachusetts... Hampshire County in western Massachusetts... Southeastern Franklin County in western Massachusetts... Central Hampden County in western Massachusetts... * Until 515 PM EDT. * At 413 PM EDT, a severe thunderstorm was located near Northampton, moving east at 15 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, Holyoke, Amherst, Northampton, Ludlow, South Hadley, Easthampton, Belchertown, Wilbraham, Palmer, Ware, Monson, Granby, Southampton, Hadley, Sunderland, Hatfield, Hardwick and Williamsburg. 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 4224 7288 4247 7279 4242 7224 4210 7231 TIME...MOT...LOC 2013Z 281DEG 14KT 4236 7272 HAIL...0.75IN WIND...60MPH $$ Loconto
1 follow-up statement
675
WWUS51 KBOX 062053
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
453 PM EDT Tue Jul 6 2021
MAC011-013-015-027-062101-
/O.CAN.KBOX.SV.W.0045.000000T0000Z-210706T2115Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
453 PM EDT Tue Jul 6 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL WORCESTER...
HAMPSHIRE...SOUTHEASTERN FRANKLIN AND CENTRAL HAMPDEN COUNTIES IS
CANCELLED...
The earlier storm which prompted the warning has moved out of the
area. Therefore, the warning has been cancelled. However, another
severe storm was approaching from the west which is covered by a new
warning.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western and central Massachusetts.
LAT...LON 4224 7288 4247 7279 4242 7224 4210 7231
TIME...MOT...LOC 2049Z 281DEG 14KT 4233 7252
$$
FrankThe 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, 4:20 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, 5:21 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.