Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 72, NWS Gray, ME

July 23, 2021Rockingham County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 23, 2021, 4:38 PM EDT for Rockingham County, New Hampshire. It was in force for 18 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 23, 2021, 4:38 PM EDT (20:38 UTC)
Expired: Jul 23, 2021, 4:56 PM EDT
In force: 18 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Rockingham County, NH

The radar

The Boston radar (KBOX), 104 km from the middle of the area, began a volume at 20:40 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, 8.6 hours before the alert went out and 125 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: 16 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1504 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: -5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

814 
WUUS51 KGYX 232038
SVRGYX
NHC015-232115-
/O.NEW.KGYX.SV.W.0072.210723T2038Z-210723T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gray ME
438 PM EDT Fri Jul 23 2021

The National Weather Service in Gray Maine has issued a

* Severe Thunderstorm Warning for...
  Southeastern Rockingham County in southern New Hampshire...

* Until 515 PM EDT.

* At 437 PM EDT, a severe thunderstorm was located near Seabrook, or
  near Exeter, moving southeast at 20 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Exeter, Brentwood, Seabrook, Kingston, Danville, East Kingston,
  Hampton Falls, Kensington, Newton, South Hampton and Plaistow.

This includes Interstate 95 in New Hampshire between mile markers 0
and 2.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4292 7112 4297 7104 4298 7097 4285 7078
      4284 7082 4287 7082 4286 7085 4288 7088
      4289 7092 4287 7097 4286 7103 4285 7105
      4282 7106
TIME...MOT...LOC 2037Z 327DEG 19KT 4290 7099 

HAIL...1.25IN
WIND...60MPH
 
$$

MSC

1 follow-up statement

717 
WWUS51 KGYX 232056
SVSGYX

Severe Weather Statement
National Weather Service Gray ME
456 PM EDT Fri Jul 23 2021

NHC015-232105-
/O.CAN.KGYX.SV.W.0072.000000T0000Z-210723T2115Z/
Rockingham NH-
456 PM EDT Fri Jul 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ROCKINGHAM COUNTY
IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Gray Maine.

Remember, a Severe Thunderstorm Warning still remains in effect for
the northwest portion of Rockingham County.

LAT...LON 4292 7112 4297 7104 4298 7097 4285 7078
      4284 7082 4287 7082 4286 7085 4288 7088
      4289 7092 4287 7097 4286 7103 4285 7105
      4282 7106
TIME...MOT...LOC 2052Z 327DEG 19KT 4282 7092 

$$

Kimble

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 12:31 PM EDT	Special Weather Statement	GYX	Coos	29 min
Jul 23, 12:53 PM EDT	Special Weather Statement	GYX	Hillsborough	37 min
Jul 23, 12:57 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Strafford	33 min
Jul 23, 1:20 PM EDT	Special Weather Statement	GYX	Belknap	25 min
Jul 23, 1:37 PM EDT	Special Weather Statement	GYX	Carroll	23 min
Jul 23, 1:52 PM EDT	Special Weather Statement	GYX	Carroll	23 min
Jul 23, 2:13 PM EDT	Severe Thunderstorm Warning	GYX	Rockingham, Strafford	27 min
Jul 23, 2:16 PM EDT	Special Weather Statement	GYX	Carroll	29 min
Jul 23, 2:24 PM EDT	Severe Thunderstorm Warning	GYX	Carroll	51 min
Jul 23, 2:36 PM EDT	Special Weather Statement	GYX	Belknap	24 min
Jul 23, 2:42 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton	33 min
Jul 23, 3:35 PM EDT	Special Weather Statement	GYX	Coos	25 min
Jul 23, 3:38 PM EDT	Severe Thunderstorm Warning	GYX	Rockingham	21 min
Jul 23, 3:39 PM EDT	Coastal Flood Statement	GYX	Rockingham	10 hr
Jul 23, 4:18 PM EDT	Special Weather Statement	GYX	Merrimack	27 min
Jul 23, 4:27 PM EDT	Special Weather Statement	GYX	Rockingham	33 min
Jul 23, 4:43 PM EDT	Severe Thunderstorm Warning	GYX	Hillsborough, Merrimack, Rockingham	47 min
Jul 23, 5:18 PM EDT	Severe Thunderstorm Warning	GYX	Carroll, Coos, Grafton	42 min
Jul 23, 5:35 PM EDT	Severe Thunderstorm Warning	GYX	Carroll	18 min
Jul 23, 5:59 PM EDT	Special Weather Statement	GYX	Coos	31 min
Jul 23, 6:25 PM EDT	Special Weather Statement	GYX	Grafton	35 min
Jul 23, 7:35 PM EDT	Special Weather Statement	GYX	Carroll	25 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.