Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 71, NWS Gray, ME

July 23, 2021Rockingham County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 23, 2021, 3:38 PM EDT for Rockingham County, New Hampshire. It was in force for 21 min. 1 report 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: Jul 23, 2021, 3:38 PM EDT (19:38 UTC)
Expired: Jul 23, 2021, 3:59 PM EDT
In force: 21 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Rockingham County, NH

The radar

The Boston radar (KBOX), 112 km from the middle of the area, began a volume at 19:42 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
Jul 23, 3:40 PM EDT	HAIL 0.7	North Hampton, NH	TIME ESTIMATED BASED ON RADAR.

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

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 7.6 hours before the alert went out and 115 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.

645 
WUUS51 KGYX 231938
SVRGYX
NHC015-232015-
/O.NEW.KGYX.SV.W.0071.210723T1938Z-210723T2015Z/

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

The National Weather Service in Gray Maine has issued a

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

* Until 415 PM EDT.

* At 338 PM EDT, a severe thunderstorm was located over Rye, or near
  Portsmouth, moving south 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 roofs, siding, and trees.

* Locations impacted include...
  Portsmouth, Hampton, Exeter, Greenland, Stratham, Seabrook, Rye,
  Hampton Falls, North Hampton and New Castle.

This includes Interstate 95 in New Hampshire between mile markers 0
and 12.
 
This also includes...
  Hampton Beach.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4287 7082 4286 7085 4288 7088 4289 7091
      4302 7093 4305 7086 4306 7070 4302 7067
      4298 7071 4285 7078 4284 7082
TIME...MOT...LOC 1938Z 340DEG 19KT 4299 7082 

HAIL...1.00IN
WIND...60MPH
 
$$

MSC

1 follow-up statement

025 
WWUS51 KGYX 231959
SVSGYX

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

NHC015-232009-
/O.CAN.KGYX.SV.W.0071.000000T0000Z-210723T2015Z/
Rockingham NH-
359 PM EDT Fri Jul 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ROCKINGHAM COUNTY
IS CANCELLED...
                
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 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.

LAT...LON 4287 7082 4286 7085 4288 7088 4289 7091
      4302 7093 4305 7086 4306 7070 4302 7067
      4298 7071 4285 7078 4284 7082
TIME...MOT...LOC 1958Z 340DEG 19KT 4288 7077 

$$

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, 3:39 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, 4:38 PM EDT	Severe Thunderstorm Warning	GYX	Rockingham	18 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.