Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 75, NWS Gray, ME

July 23, 2021Carroll County, Coos County, Grafton County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 23, 2021, 5:18 PM EDT for Carroll County, Coos County, Grafton County, New Hampshire. It was in force for 42 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, 5:18 PM EDT (21:18 UTC)
Expired: Jul 23, 2021, 6:00 PM EDT
In force: 42 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carroll County, NH, Coos County, NH, Grafton County, NH

The radar

The Portland,ME radar (KGYX), 122 km from the middle of the area, began a volume at 21:20 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, 6:05 PM EDT	HAIL 0.5	Carroll, NH

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, 9.3 hours before the alert went out and 122 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.

737 
WUUS51 KGYX 232118
SVRGYX
NHC003-007-009-232200-
/O.NEW.KGYX.SV.W.0075.210723T2118Z-210723T2200Z/

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

The National Weather Service in Gray Maine has issued a

* Severe Thunderstorm Warning for...
  Southwestern Coos County in northern New Hampshire...
  Northeastern Grafton County in northern New Hampshire...
  North central Carroll County in northern New Hampshire...

* Until 600 PM EDT.

* At 517 PM EDT, a severe thunderstorm was located near Lancaster,
  moving south 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 roofs, siding, and trees.

* Locations impacted include...
  Berlin, Lancaster, Bethlehem, Lincoln, Pinkham Notch, Mount
  Washington, Carroll, Bartlett, Jefferson, Jackson, Hart's Location,
  Randolph, Northumberland, Whitefield, Stark, Livermore and Milan.

This also includes...
  Crawford Notch State Park, Mount Jefferson, Mount Madison, Mount
Eisenhower, and Mount Adams.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4448 7163 4447 7163 4450 7158 4452 7159
      4454 7158 4456 7160 4457 7159 4456 7156
      4457 7155 4458 7155 4459 7154 4460 7155
      4457 7134 4414 7115 4406 7151 4448 7164
TIME...MOT...LOC 2117Z 343DEG 22KT 4446 7149 

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

MSC

1 follow-up statement

529 
WWUS51 KGYX 232140
SVSGYX

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

NHC003-007-009-232200-
/O.CON.KGYX.SV.W.0075.000000T0000Z-210723T2200Z/
Coos NH-Grafton NH-Carroll NH-
540 PM EDT Fri Jul 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHWESTERN COOS...NORTHEASTERN GRAFTON AND NORTH CENTRAL
CARROLL COUNTIES...

At 540 PM EDT, a severe thunderstorm was located 9 miles northwest of
Mount Washington, or 10 miles southeast of Lancaster, 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...
Berlin, Lancaster, Bethlehem, Lincoln, Franconia, Pinkham Notch,
Mount Washington, Carroll, Bartlett, Jefferson, Dalton, Jackson,
Whitefield, Hart's Location, Randolph and Livermore.

This also includes...
  Crawford Notch State Park, Mount Jefferson, Mount Madison, Mount
Eisenhower, and Mount Adams.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4414 7115 4406 7151 4443 7163 4448 7150
      4448 7130
TIME...MOT...LOC 2140Z 342DEG 17KT 4437 7145 

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

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, 4:38 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, 5:35 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.