Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 52, NWS Gray, ME
NWS Gray, ME issued this severe thunderstorm warning at Jul 20, 2021, 10:36 PM EDT for Cheshire County, Hillsborough County, New Hampshire. It was in force for 39 min. 2 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
- Jul 20, 2021, 10:36 PM EDT (02:36 UTC)
- Expired
- Jul 20, 2021, 11:15 PM EDT
- In force
- 39 min
- Issued by
- NWS Gray, ME
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Cheshire County, NH, Hillsborough County, NH
The radar
The Albany radar (KENX), 138 km from the middle of the area, began a volume at 02:38 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 20, 10:50 PM EDT | HAIL 1.25 | 2 E Hinsdale, NH | |
| Jul 20, 11:05 PM EDT | TSTM WND DMG | 1 Se Peterborough, NH | CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 SE PETERBOROUGH. SEVERAL TREES DOWN AROUND INTERSECTION OF 202 AND 101. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Albany, NY (KALY), launched 00:00Z, 2.6 hours before the alert went out and 117 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
- 1226 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1198 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 4.6
The text
As transmitted.
210
WUUS51 KGYX 210236
SVRGYX
NHC005-011-210315-
/O.NEW.KGYX.SV.W.0052.210721T0236Z-210721T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gray ME
1036 PM EDT Tue Jul 20 2021
The National Weather Service in Gray Maine has issued a
* Severe Thunderstorm Warning for...
Cheshire County in southern New Hampshire...
Southwestern Hillsborough County in southern New Hampshire...
* Until 1115 PM EDT.
* At 1036 PM EDT, severe thunderstorms were located along a line
extending from near Roxbury to Chesterfield to near Hinsdale,
moving east at 35 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...
Keene, Jaffrey, Swanzey, Peterborough, Winchester, Greenfield,
Dublin, Richmond, Harrisville, Nelson, Marlborough, Rindge,
Hancock, Sharon, Westmoreland, Hinsdale, Roxbury, Fitzwilliam, Troy
and Chesterfield.
This also includes...
Mount Monadnock.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4288 7255 4290 7253 4296 7252 4297 7248
4299 7247 4298 7188 4271 7195 4273 7246
4277 7249 4277 7252 4278 7251 4281 7254
TIME...MOT...LOC 0236Z 255DEG 29KT 4297 7223 4290 7247 4274 7259
HAIL...1.00IN
WIND...60MPH
$$
Ekster2 follow-up statements
325
WWUS51 KGYX 210300
SVSGYX
Severe Weather Statement
National Weather Service Gray ME
1100 PM EDT Tue Jul 20 2021
NHC005-011-210315-
/O.CON.KGYX.SV.W.0052.000000T0000Z-210721T0315Z/
Cheshire NH-Hillsborough NH-
1100 PM EDT Tue Jul 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR SOUTHEASTERN CHESHIRE AND WEST CENTRAL HILLSBOROUGH COUNTIES...
At 1100 PM EDT, severe thunderstorms were located along a line
extending from near Hancock to near Marlborough to near Richmond,
moving east at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Keene, Jaffrey, Swanzey, Peterborough, Rindge, Winchester, Dublin,
Richmond, Harrisville, Nelson, Marlborough, Fitzwilliam, Hancock,
Troy and Roxbury.
This also includes...
Mount Monadnock.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4298 7193 4272 7213 4272 7216 4273 7240
4295 7220 4298 7210
TIME...MOT...LOC 0300Z 258DEG 31KT 4301 7201 4287 7213 4274 7234
HAIL...1.00IN
WIND...60MPH
$$674
WWUS51 KGYX 210309
SVSGYX
Severe Weather Statement
National Weather Service Gray ME
1109 PM EDT Tue Jul 20 2021
NHC005-011-210319-
/O.EXP.KGYX.SV.W.0052.000000T0000Z-210721T0315Z/
Cheshire NH-Hillsborough NH-
1109 PM EDT Tue Jul 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHESHIRE AND WEST
CENTRAL HILLSBOROUGH COUNTIES WILL EXPIRE AT 1115 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However heavy rain
is still possible with these thunderstorms.
LAT...LON 4298 7193 4272 7213 4272 7216 4273 7240
4295 7220 4298 7210
TIME...MOT...LOC 0309Z 255DEG 29KT 4302 7193 4288 7205 4275 7226
$$The office that day
Everything else NWS Gray, ME issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:55 PM EDT | Special Weather Statement | GYX | Grafton | 50 min |
| Jul 20, 8:58 PM EDT | Severe Thunderstorm Warning | GYX | Grafton | 47 min |
| Jul 20, 9:15 PM EDT | Special Weather Statement | GYX | Sullivan | 30 min |
| Jul 20, 9:24 PM EDT | Severe Thunderstorm Warning | GYX | Grafton, Sullivan | 29 min |
| Jul 20, 9:35 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Grafton, Merrimack, Sullivan | 40 min |
| Jul 20, 9:47 PM EDT | Special Weather Statement | GYX | Sullivan | 43 min |
| Jul 20, 10:10 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Carroll, Grafton | 50 min |
| Jul 20, 10:14 PM EDT | Severe Thunderstorm Warning | GYX | Cheshire, Hillsborough, Merrimack, Sullivan | 46 min |
| Jul 20, 10:15 PM EDT | Special Weather Statement | GYX | Rockingham | 45 min |
| Jul 20, 10:33 PM EDT | Special Weather Statement | GYX | Cheshire | 42 min |
| Jul 20, 10:38 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Carroll, Strafford | 41 min |
| Jul 20, 10:57 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Cheshire, Hillsborough, Merrimack | 48 min |
| Jul 20, 11:10 PM EDT | Special Weather Statement | GYX | Rockingham | 35 min |
| Jul 20, 11:28 PM EDT | Severe Thunderstorm Warning | GYX | Hillsborough, Merrimack, Rockingham | 47 min |
| Jul 20, 11:32 PM EDT | Special Weather Statement | GYX | Strafford | 43 min |
| Jul 20, 11:42 PM EDT | Special Weather Statement | GYX | Rockingham | 48 min |
| Jul 20, 11:55 PM EDT | Severe Thunderstorm Warning | GYX | Rockingham | 25 min |
| Jul 21, 12:06 AM EDT | Special Weather Statement | GYX | Rockingham | 24 min |
| Jul 21, 12:13 AM EDT | Severe Thunderstorm Warning | GYX | Rockingham, Strafford | 30 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.