Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 21, NWS Boston/Norton, MA

June 6, 20254 counties in Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 6, 2025, 5:44 PM EDT for 4 counties in Massachusetts. It was in force for 46 min. 4 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: Jun 6, 2025, 5:44 PM EDT (21:44 UTC)
Expired: Jun 6, 2025, 6:30 PM EDT
In force: 46 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 125 km from the middle of the area, began a volume at 21:47 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
Jun 6, 6:20 PM EDT	TSTM WND DMG	2 Ese Northampton, MA	Corrects previous non-tstm wnd dmg report from 2 ESE Northampton. In Northampton, trees were down in the Leeds section. Relayed by amateur radio.
Jun 6, 6:20 PM EDT	TSTM WND DMG	Northampton, MA	Corrects previous non-tstm wnd dmg report from Northampton. In Northampton, a tree fell on a house in the Florence section.
Jun 6, 6:20 PM EDT	NON-TSTM WND DMG	2 Ese Northampton, MA	In Northampton, trees were down in the Leeds section. Relayed by amateur radio.
Jun 6, 6:20 PM EDT	NON-TSTM WND DMG	Northampton, MA	In Northampton, a tree fell on a house in the Florence section.

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, 9.7 hours before the alert went out and 111 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 53 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

001 
WUUS51 KBOX 062144
SVRBOX
MAC011-013-015-027-062230-
/O.NEW.KBOX.SV.W.0021.250606T2144Z-250606T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
544 PM EDT Fri Jun 6 2025

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...
  North central Hampden County in western Massachusetts...

* Until 630 PM EDT.

* At 543 PM EDT, a severe thunderstorm was located over Northampton,
  moving east at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to trees and power lines.

* Locations impacted include...
  Holyoke, Amherst, Northampton, South Hadley, Easthampton,
  Belchertown, Ware, Granby, Southampton, Hadley, Sunderland,
  Hatfield, Hardwick, Williamsburg, Leverett, Shutesbury,
  Westhampton, Whately, Pelham, and Petersham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4219 7272 4236 7281 4253 7235 4230 7226
TIME...MOT...LOC 2143Z 249DEG 20KT 4233 7263 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hrencecin

1 follow-up statement

527 
WWUS51 KBOX 062228
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
628 PM EDT Fri Jun 6 2025

MAC011-013-015-027-062237-
/O.EXP.KBOX.SV.W.0021.000000T0000Z-250606T2230Z/
Worcester MA-Hampshire MA-Franklin MA-Hampden MA-
628 PM EDT Fri Jun 6 2025

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL WORCESTER...
SOUTHEASTERN HAMPSHIRE...SOUTHEASTERN FRANKLIN AND NORTH CENTRAL
HAMPDEN COUNTIES WILL EXPIRE AT 630 PM EDT...

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 will be allowed to expire.

LAT...LON 4219 7272 4236 7281 4253 7235 4230 7226
TIME...MOT...LOC 2227Z 249DEG 20KT 4241 7234 

$$

Hrencecin

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 6, 2:24 AM EDT	Flood Watch	BOX	Essex, Franklin, Hampden, Hampshire, Middlesex, Worcester	19 hr
Jun 6, 6:52 AM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	53 min
Jun 6, 3:24 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	51 min
Jun 6, 3:25 PM EDT	Flash Flood Warning	BOX	Franklin, Hampshire	3 hr
Jun 6, 3:38 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	52 min
Jun 6, 4:16 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	44 min
Jun 6, 4:52 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	53 min
Jun 6, 5:05 PM EDT	Flash Flood Warning	BOX	Franklin, Hampshire, Worcester	114 min
Jun 6, 5:05 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	40 min
Jun 6, 5:32 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	13 min
Jun 6, 6:09 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	51 min
Jun 6, 6:31 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	83 min
Jun 6, 7:14 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	22 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2025 Every severe thunderstorm warning in 2025

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.