Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 21, NWS Boston/Norton, MA

June 26, 2026Essex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 26, 2026, 5:44 PM EDT for Essex County, Massachusetts. It was in force for 48 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: Jun 26, 2026, 5:44 PM EDT (21:44 UTC)
Expired: Jun 26, 2026, 6:32 PM EDT
In force: 48 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Essex County, MA

The radar

The Boston radar (KBOX), 99 km from the middle of the area, began a volume at 21:46 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

Gray, ME (KGYX), launched 12:00Z, 9.7 hours before the alert went out and 128 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 921 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

658 
WUUS51 KBOX 262144
SVRBOX
MAC009-262245-
/O.NEW.KBOX.SV.W.0021.260626T2144Z-260626T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
544 PM EDT Fri Jun 26 2026

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northeastern Essex County in northeastern Massachusetts...

* Until 645 PM EDT.

* At 543 PM EDT, a severe thunderstorm was located near Seabrook, or
  near Hampton, moving southeast at 15 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...
  Newburyport, Amesbury, Ipswich, Salisbury, Newbury, Merrimac,
  Rowley, and West Newbury.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4286 7085 4287 7082 4283 7081 4281 7087
      4280 7083 4282 7082 4280 7081 4280 7079
      4271 7074 4271 7068 4267 7074 4286 7103
      4287 7097 4289 7093 4289 7090
TIME...MOT...LOC 2143Z 304DEG 12KT 4292 7093 

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

$$

Frank

4 follow-up statements

361 
WWUS51 KBOX 262200
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
600 PM EDT Fri Jun 26 2026

MAC009-262245-
/O.CON.KBOX.SV.W.0021.000000T0000Z-260626T2245Z/
Essex MA-
600 PM EDT Fri Jun 26 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHEASTERN ESSEX COUNTY...

At 600 PM EDT, a severe thunderstorm was located over Salisbury, or 7
miles south of Hampton, moving southeast at 20 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...
Newburyport, Amesbury, Ipswich, Salisbury, Newbury, Merrimac, Rowley,
and West Newbury.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4286 7085 4287 7082 4283 7081 4281 7087
      4280 7083 4282 7082 4280 7081 4280 7079
      4271 7074 4271 7068 4267 7074 4286 7103
      4287 7097 4289 7093 4289 7090
TIME...MOT...LOC 2200Z 315DEG 19KT 4283 7083 

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

$$

Frank

219 
WWUS51 KBOX 262209
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
609 PM EDT Fri Jun 26 2026

MAC009-262245-
/O.CON.KBOX.SV.W.0021.000000T0000Z-260626T2245Z/
Essex MA-
609 PM EDT Fri Jun 26 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHEASTERN ESSEX COUNTY...

At 609 PM EDT, a severe thunderstorm was located near Salisbury, or 9
miles south of Hampton, moving southeast at 15 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...
Newburyport, Amesbury, Ipswich, Salisbury, Newbury, Rowley, and West
Newbury.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4286 7085 4287 7082 4283 7081 4281 7087
      4280 7083 4282 7082 4280 7081 4280 7079
      4270 7073 4271 7068 4267 7074 4280 7094
      4285 7095 4288 7089
TIME...MOT...LOC 2209Z 304DEG 12KT 4281 7079 

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

$$

Frank

059 
WWUS51 KBOX 262217
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
617 PM EDT Fri Jun 26 2026

MAC009-262245-
/O.CON.KBOX.SV.W.0021.000000T0000Z-260626T2245Z/
Essex MA-
617 PM EDT Fri Jun 26 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHEASTERN ESSEX COUNTY...

At 616 PM EDT, a severe thunderstorm was located near Newbury, or 10
miles south of Hampton, moving southeast at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Newburyport, Ipswich, Salisbury, Newbury, and Rowley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4283 7081 4281 7087 4281 7084 4280 7083
      4282 7082 4280 7081 4280 7079 4270 7073
      4271 7069 4267 7074 4277 7089 4285 7088
      4287 7082
TIME...MOT...LOC 2216Z 304DEG 12KT 4280 7076 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Frank

565 
WWUS51 KBOX 262232
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
632 PM EDT Fri Jun 26 2026

MAC009-262241-
/O.CAN.KBOX.SV.W.0021.000000T0000Z-260626T2245Z/
Essex MA-
632 PM EDT Fri Jun 26 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ESSEX COUNTY IS
CANCELLED...

The storm which prompted the warning has weakened below severe 
limits, and has moved offshore. Therefore, the warning has been 
cancelled.

LAT...LON 4283 7081 4281 7087 4281 7084 4280 7083
      4282 7082 4280 7081 4280 7079 4270 7073
      4271 7069 4267 7074 4277 7089 4285 7088
      4287 7082
TIME...MOT...LOC 2229Z 304DEG 12KT 4277 7070 

$$

NASH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 5:09 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	48 min
Jun 26, 5:56 PM EDT	Special Marine Warning	BOX		64 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2026 Every severe thunderstorm warning in 2026

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.