Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 28, NWS Gray, ME

June 28, 2021Carroll County, Grafton County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jun 28, 2021, 6:15 PM EDT for Carroll County, Grafton County, New Hampshire. It was in force for 21 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 28, 2021, 6:15 PM EDT (22:15 UTC)
Expired: Jun 28, 2021, 6:36 PM EDT
In force: 21 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Carroll County, NH, Grafton County, NH

The radar

The Portland,ME radar (KGYX), 105 km from the middle of the area, began a volume at 22:17 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, 10.3 hours before the alert went out and 105 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: 150 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1426 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

519 
WUUS51 KGYX 282215
SVRGYX
NHC003-009-282300-
/O.NEW.KGYX.SV.W.0028.210628T2215Z-210628T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gray ME
615 PM EDT Mon Jun 28 2021

The National Weather Service in Gray Maine has issued a

* Severe Thunderstorm Warning for...
  East central Grafton County in northern New Hampshire...
  West central Carroll County in northern New Hampshire...

* Until 700 PM EDT.

* At 614 PM EDT, a severe thunderstorm was located 7 miles south of
  Woodstock, or 7 miles north of Plymouth, moving east at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Moultonborough, Plymouth, Holderness, Sandwich, Tamworth, Albany,
  Ellsworth, Thornton, Waterville Valley, Campton and Rumney.

This includes Interstate 93 between mile markers 82 and 93.
 
This also includes...
  Mount Whiteface, Welch Mountain, Dickey Mountain, The Tripyramids,
and Mount Passaconaway.
 
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 4392 7174 4400 7133 4374 7130 4378 7174
TIME...MOT...LOC 2214Z 266DEG 18KT 4387 7165 

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

Tubbs

1 follow-up statement

638 
WWUS51 KGYX 282236
SVSGYX

Severe Weather Statement
National Weather Service Gray ME
636 PM EDT Mon Jun 28 2021

NHC003-009-282246-
/O.CAN.KGYX.SV.W.0028.000000T0000Z-210628T2300Z/
Grafton NH-Carroll NH-
636 PM EDT Mon Jun 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GRAFTON AND WEST
CENTRAL CARROLL COUNTIES 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.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 4392 7174 4400 7133 4374 7130 4378 7174
TIME...MOT...LOC 2234Z 266DEG 18KT 4388 7150 

$$

Tubbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 4:09 PM EDT	Special Weather Statement	GYX	Carroll	36 min
Jun 28, 4:13 PM EDT	Heat Advisory	GYX	Belknap, Carroll, Cheshire, Grafton, Hillsborough, Merrimack and 3 more	28 hr
Jun 28, 5:41 PM EDT	Special Weather Statement	GYX	Coos	34 min
Jun 28, 6:10 PM EDT	Special Weather Statement	GYX	Grafton	35 min
Jun 28, 6:36 PM EDT	Special Weather Statement	GYX	Coos	24 min
Jun 28, 6:42 PM EDT	Special Weather Statement	GYX	Grafton	33 min
Jun 28, 6:59 PM EDT	Special Weather Statement	GYX	Grafton	31 min
Jun 28, 7:38 PM EDT	Special Weather Statement	GYX	Grafton	37 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.