Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 39, NWS Gray, ME
NWS Gray, ME issued this severe thunderstorm warning at Jun 30, 2021, 5:12 PM EDT for Hillsborough County, Rockingham County, New Hampshire. It was in force for 33 min. 6 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
- Jun 30, 2021, 5:12 PM EDT (21:12 UTC)
- Expired
- Jun 30, 2021, 5:45 PM EDT
- In force
- 33 min
- Issued by
- NWS Gray, ME
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Hillsborough County, NH, Rockingham County, NH
The radar
The Boston radar (KBOX), 94 km from the middle of the area, began a volume at 21:13 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 |
|---|---|---|---|
| Jun 30, 5:14 PM EDT | TSTM WND DMG | 2 W Nashua, NH | MULTIPLE TREES DOWN ON BROAD STREET. TIME ESTIMATED FROM RADAR. |
| Jun 30, 5:15 PM EDT | TSTM WND DMG | 2 Nw Nashua, NH | CORRECTS TIME OF PREVIOUS TSTM WND DMG REPORT FROM 2 NW NASHUA. LARGE TREE LIMB DOWN ON LUTHERAN DRIVE. TIME ESTIMATED BY RADAR. |
| Jun 30, 5:20 PM EDT | TSTM WND DMG | 2 Nnw Salem, NH | MULTIPLE TREES DOWN. TIME ESTIMATED FROM RADAR. |
| Jun 30, 5:25 PM EDT | TSTM WND DMG | Salem, NH | MULTIPLE TREES DOWN ALONG RTE. 111 BEFORE I-93. |
| Jun 30, 5:30 PM EDT | TSTM WND DMG | 2 Wnw Atkinson, NH | LARGE TREE FELL ON A HOUSE LEAVING IT UNINHABITABLE. TIME ESTIMATED BASED ON RADAR. |
| Jun 30, 5:45 PM EDT | TSTM WND DMG | 2 N Dracut, MA | LARGE TREE DOWN ON LONGPOND DRIVE |
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 |
|---|---|---|---|
| Jun 30, 12:06 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Gray, ME (KGYX), launched 12:00Z, 9.2 hours before the alert went out and 142 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.
- Mixed-layer CAPE
- 906 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 1312 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.3
The text
As transmitted.
833
WUUS51 KGYX 302112
SVRGYX
NHC011-015-302200-
/O.NEW.KGYX.SV.W.0039.210630T2112Z-210630T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gray ME
512 PM EDT Wed Jun 30 2021
The National Weather Service in Gray Maine has issued a
* Severe Thunderstorm Warning for...
Southwestern Rockingham County in southern New Hampshire...
Southeastern Hillsborough County in southern New Hampshire...
* Until 600 PM EDT.
* At 512 PM EDT, a severe thunderstorm was located over Nashua,
moving east at 30 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...
Nashua, Derry, Merrimack, Salem, Amherst, Litchfield, Hollis,
Hudson, Pelham, Seabrook, Londonderry, Hampstead, Atkinson,
Kingston, Windham, Plaistow, Newton and South Hampton.
This includes the following highways...
Interstate 93 between mile markers 0 and 11.
Interstate 95 in New Hampshire near mile marker 0.
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 4270 7159 4285 7159 4289 7088 4288 7088
4288 7093 4287 7097 4286 7103 4281 7107
4282 7113 4281 7116 4279 7119 4274 7118
4274 7125 4270 7129
TIME...MOT...LOC 2112Z 268DEG 26KT 4277 7148
HAIL...1.25IN
WIND...60MPH
$$
Ekster2 follow-up statements
491
WWUS51 KGYX 302129
SVSGYX
Severe Weather Statement
National Weather Service Gray ME
529 PM EDT Wed Jun 30 2021
NHC011-302139-
/O.CAN.KGYX.SV.W.0039.000000T0000Z-210630T2200Z/
Hillsborough NH-
529 PM EDT Wed Jun 30 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HILLSBOROUGH
COUNTY IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
southern New Hampshire.
LAT...LON 4274 7120 4287 7123 4288 7114 4289 7088
4288 7088 4288 7093 4287 7097 4286 7103
4281 7107 4282 7113 4281 7116 4279 7119
4274 7118
TIME...MOT...LOC 2129Z 268DEG 26KT 4277 7131
$$
NHC015-302200-
/O.CON.KGYX.SV.W.0039.000000T0000Z-210630T2200Z/
Rockingham NH-
529 PM EDT Wed Jun 30 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTH CENTRAL ROCKINGHAM COUNTY...
At 529 PM EDT, a severe thunderstorm was located over Pelham, or near
Salem, moving east at 30 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...
Derry, Salem, Seabrook, Hampstead, Atkinson, Kingston, Newton, South
Hampton and Plaistow.
This includes Interstate 95 in New Hampshire near mile marker 0.
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 4274 7120 4287 7123 4288 7114 4289 7088
4288 7088 4288 7093 4287 7097 4286 7103
4281 7107 4282 7113 4281 7116 4279 7119
4274 7118
TIME...MOT...LOC 2129Z 268DEG 26KT 4277 7131
HAIL...1.00IN
WIND...60MPH
$$277
WWUS51 KGYX 302145
SVSGYX
Severe Weather Statement
National Weather Service Gray ME
545 PM EDT Wed Jun 30 2021
NHC015-302154-
/O.CAN.KGYX.SV.W.0039.000000T0000Z-210630T2200Z/
Rockingham NH-
545 PM EDT Wed Jun 30 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ROCKINGHAM
COUNTY IS CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However heavy rain is
still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
southern New Hampshire.
LAT...LON 4274 7120 4287 7123 4288 7114 4289 7088
4288 7088 4288 7093 4287 7097 4286 7103
4281 7107 4282 7113 4281 7116 4279 7119
4274 7118
TIME...MOT...LOC 2143Z 268DEG 26KT 4277 7115
$$The office that day
Everything else NWS Gray, ME issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 2:39 PM EDT | Special Weather Statement | GYX | Grafton | 36 min |
| Jun 30, 3:02 PM EDT | Severe Thunderstorm Warning | GYX | Grafton, Sullivan | 43 min |
| Jun 30, 3:10 PM EDT | Severe Thunderstorm Warning | GYX | Carroll, Coos, Grafton | 17 min |
| Jun 30, 3:42 PM EDT | Special Weather Statement | GYX | Belknap | 48 min |
| Jun 30, 3:43 PM EDT | Special Weather Statement | GYX | Cheshire | 47 min |
| Jun 30, 4:01 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Carroll, Grafton, Merrimack, Strafford | 27 min |
| Jun 30, 4:05 PM EDT | Severe Thunderstorm Warning | GYX | Cheshire, Sullivan | 35 min |
| Jun 30, 4:11 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Carroll, Merrimack, Strafford | 49 min |
| Jun 30, 4:25 PM EDT | Severe Thunderstorm Warning | GYX | Cheshire, Hillsborough | 50 min |
| Jun 30, 4:44 PM EDT | Special Weather Statement | GYX | Merrimack | 46 min |
| Jun 30, 4:53 PM EDT | Special Weather Statement | GYX | Rockingham | 37 min |
| Jun 30, 4:58 PM EDT | Severe Thunderstorm Warning | GYX | Rockingham | 32 min |
Nearby
Severe Thunderstorm Warnings in New Hampshire, 2021Every 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.