Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Gray, ME

May 26, 20215 counties in New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at May 26, 2021, 5:52 PM EDT for 5 counties in New Hampshire. It was in force for 53 min. 9 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: May 26, 2021, 5:52 PM EDT (21:52 UTC)
Expired: May 26, 2021, 6:45 PM EDT
In force: 53 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Belknap County, NH, Carroll County, NH, Grafton County, NH, Merrimack County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 100 km from the middle of the area, began a volume at 21:55 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
May 26, 5:54 PM EDT	TSTM WND DMG	2 S Bristol, NH	TREES AND WIRES DOWN.
May 26, 6:06 PM EDT	TSTM WND DMG	3 Ene Sandwich, NH	TREES AND BRANCHES DOWN EAST OF SANDWICH AND MOULTONBOROUGH.
May 26, 6:10 PM EDT	TSTM WND DMG	1 Sw Laconia, NH	TREES AND WIRES DOWN AT DIANE DRIVE AND PETER CT.
May 26, 6:10 PM EDT	TSTM WND DMG	Andover, NH	TREES AND WIRES DOWN.
May 26, 6:15 PM EDT	TSTM WND DMG	3 Ne Gilford, NH	TREE AND WIRES DOWN. TIME ESTIMATED BASED ON RADAR.
May 26, 6:15 PM EDT	TSTM WND DMG	4 Wnw Laconia, NH	SEVERAL TREES AND WIRES DOWN.
May 26, 6:18 PM EDT	TSTM WND DMG	1 Sse Laconia, NH	TREES AND WIRES DOWN.
May 26, 6:23 PM EDT	TSTM WND GST 60	3 Ene Gilford, NH	MEASURED BY A PERSONAL WEATHER STATION.
May 26, 6:50 PM EDT	TSTM WND DMG	2 N Milton, NH	TREES DOWN ON NUTES RD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 26, 3:56 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 9.9 hours before the alert went out and 100 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: 9 J/kg
Mixed-layer CIN: -211 J/kg
Mixed-layer LCL: 1555 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

895 
WUUS51 KGYX 262152
SVRGYX
NHC001-003-009-013-017-262245-
/O.NEW.KGYX.SV.W.0009.210526T2152Z-210526T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gray ME
552 PM EDT Wed May 26 2021

The National Weather Service in Gray Maine has issued a

* Severe Thunderstorm Warning for...
  Northwestern Strafford County in central New Hampshire...
  Southeastern Grafton County in northern New Hampshire...
  Belknap County in central New Hampshire...
  Northern Merrimack County in central New Hampshire...
  Southern Carroll County in northern New Hampshire...

* Until 645 PM EDT.

* At 550 PM EDT, severe thunderstorms were located along a line
  extending from near Sandwich to near Danbury to near New London to
  near Bradford, moving east at 55 mph.

  HAZARD...60 mph wind gusts. This storm has already produced 
           damaging winds in several towns.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Laconia, Franklin, Moultonborough, Plymouth, Ossipee, Meredith, New
  London, Farmington, Loudon, Alton, Barnstead, Gilmanton,
  Canterbury, Holderness, Ashland, Effingham, Danbury, Groton,
  Wolfeboro and Tamworth.

This includes the following highways...
 Interstate 89 between mile markers 26 and 31.
 Interstate 93 between mile markers 51 and 83.

This also includes...
  Lake Winnipesaukee, Squam Lake, and Mount Kearsage.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4343 7197 4354 7187 4379 7176 4391 7100
      4357 7097 4355 7095 4349 7097 4344 7096
      4341 7099 4333 7201
TIME...MOT...LOC 2150Z 257DEG 47KT 4378 7147 4353 7179 4343 7194 4335
7198

HAIL...<.75IN
WIND...60MPH
 
$$

Ekster

2 follow-up statements

781 
WWUS51 KGYX 262225
SVSGYX

Severe Weather Statement
National Weather Service Gray ME
625 PM EDT Wed May 26 2021

NHC001-003-009-013-017-262245-
/O.CON.KGYX.SV.W.0009.000000T0000Z-210526T2245Z/
Strafford NH-Grafton NH-Belknap NH-Merrimack NH-Carroll NH-
625 PM EDT Wed May 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHWESTERN STRAFFORD...SOUTHEASTERN GRAFTON...BELKNAP...NORTH
CENTRAL MERRIMACK AND SOUTHERN CARROLL COUNTIES...

At 624 PM EDT, severe thunderstorms were located along a line
extending from 6 miles north of Effingham to near Wolfeboro to
Laconia to near Gilmanton, moving east at 55 mph.

HAZARD...60 mph wind gusts. This storm has produced 60 MPH wind 
         gusts near Wolfeboro.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Laconia, Franklin, Moultonborough, Meredith, Ossipee, Alton,
Gilmanton, Holderness, Ashland, Effingham, Wolfeboro, Tamworth,
Sandwich, Belmont, Gilford, Madison, Acton, Freedom, Center Harber
and Brookfield.

This also includes...
  Lake Winnipesaukee and Squam Lake.
 
This includes Interstate 93 between mile markers 56 and 69.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4343 7170 4355 7168 4381 7153 4391 7100
      4357 7097 4355 7095 4349 7097 4347 7097
TIME...MOT...LOC 2224Z 257DEG 47KT 4386 7098 4361 7130 4351 7145 4343
7149

HAIL...<.75IN
WIND...60MPH
 
$$

856 
WWUS51 KGYX 262243
SVSGYX

Severe Weather Statement
National Weather Service Gray ME
643 PM EDT Wed May 26 2021

NHC001-003-009-013-017-262252-
/O.EXP.KGYX.SV.W.0009.000000T0000Z-210526T2245Z/
Strafford NH-Grafton NH-Belknap NH-Merrimack NH-Carroll NH-
643 PM EDT Wed May 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN STRAFFORD...
SOUTHEASTERN GRAFTON...BELKNAP...NORTH CENTRAL MERRIMACK AND SOUTHERN
CARROLL COUNTIES WILL EXPIRE AT 645 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
southwestern Maine...and central and northern New Hampshire.

LAT...LON 4343 7170 4355 7168 4381 7153 4391 7100
      4357 7097 4355 7095 4349 7097 4347 7097
TIME...MOT...LOC 2242Z 257DEG 47KT 4391 7066 4366 7098 4356 7114 4348
7118

$$

The office that day

Everything else NWS Gray, ME issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 4:46 PM EDT	Special Weather Statement	GYX	Grafton	29 min
May 26, 4:51 PM EDT	Severe Thunderstorm Warning	GYX	Coos, Grafton	54 min
May 26, 5:07 PM EDT	Severe Thunderstorm Warning	GYX	Grafton, Merrimack, Sullivan	53 min
May 26, 5:14 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Hillsborough, Merrimack, Sullivan	46 min
May 26, 5:58 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Cheshire, Hillsborough, Merrimack, Rockingham, Strafford and 1 more	62 min
May 26, 6:30 PM EDT	Severe Thunderstorm Warning	GYX	Carroll, Strafford	60 min
May 26, 6:59 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Hillsborough, Merrimack, Rockingham, Strafford	61 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2021 Every 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.