Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 115, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 18, 2012, 9:31 PM EDT for Cheshire County, Hillsborough County, New Hampshire. It was in force for 59 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
- Sep 18, 2012, 9:31 PM EDT (01:31 UTC)
- Expired
- Sep 18, 2012, 10:30 PM EDT
- In force
- 59 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Cheshire County, NH, Hillsborough County, NH
The radar
The Boston radar (KBOX), 142 km from the middle of the area, began a volume at 01:31 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 |
|---|---|---|---|
| Sep 18, 9:32 PM EDT | TSTM WND DMG | Winchester, NH | TREE DOWN ON RTE 10 NEAR SEMINARY ROAD |
| Sep 18, 9:34 PM EDT | TSTM WND DMG | Harrisville, NH | TREE AND WIRES DOWN ON CHURCH STREET |
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 |
|---|---|---|---|
| Sep 18, 7:54 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Albany, NY (KALY), launched 00:00Z, 1.5 hours before the alert went out and 155 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
- 47 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 675 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
770
WUUS51 KBOX 190131
SVRBOX
NHC005-011-190230-
/O.NEW.KBOX.SV.W.0115.120919T0131Z-120919T0230Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
931 PM EDT TUE SEP 18 2012
THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EASTERN CHESHIRE COUNTY IN SOUTHERN NEW HAMPSHIRE...
THIS INCLUDES THE CITIES OF...KEENE...JAFFREY...
WESTERN HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...
* UNTIL 1030 PM EDT
* AT 929 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A LINE OF SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING WINDS
IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE FROM
MARLOW TO WINCHESTER...AND WAS MOVING NORTHEAST AT 50 MPH.
* SOME LOCATIONS IN THE WARNING INCLUDE...
KEENE...JAFFREY...ANTRIM...PETERBOROUGH.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...AS WELL AS DEADLY
LIGHTNING AND TORRENTIAL RAIN. GET TO SAFE SHELTER NOW...INSIDE A
STURDY BUILDING OR IN A VEHICLE. DO NOT SEEK SHELTER UNDER TREES.
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. DRIVERS SHOULD BE ALERT FOR PONDING OF WATER AND AVOID
FLOODED ROADS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM EDT
WEDNESDAY MORNING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND.
&&
LAT...LON 4312 7185 4315 7169 4315 7166 4306 7163
4272 7186 4275 7236 4277 7239 4317 7226
4319 7217 4314 7217 4313 7205 4315 7203
4318 7203 4321 7191
TIME...MOT...LOC 0129Z 218DEG 49KT 4326 7212 4285 7226
4250 7258
$$
WTB1 follow-up statement
182
WWUS51 KBOX 190159
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
959 PM EDT TUE SEP 18 2012
NHC005-011-190230-
/O.CON.KBOX.SV.W.0115.000000T0000Z-120919T0230Z/
CHESHIRE NH-HILLSBOROUGH NH-
959 PM EDT TUE SEP 18 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR WESTERN HILLSBOROUGH AND EASTERN CHESHIRE COUNTIES...
AT 954 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING
DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG
A LINE EXTENDING FROM HILLSBOROUGH TO WINCHESTER...AND WERE MOVING
NORTHEAST AT 50 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
RINDGE...JAFFREY...PETERBOROUGH...AND ANTRIM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM EDT
WEDNESDAY MORNING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND.
&&
LAT...LON 4312 7185 4315 7169 4315 7166 4306 7163
4272 7186 4275 7236 4277 7239 4317 7226
4319 7217 4314 7217 4313 7205 4315 7203
4318 7203 4321 7191
TIME...MOT...LOC 0157Z 218DEG 49KT 4356 7179 4315 7193
4280 7226
$$
WTBThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 8:34 PM EDT | Severe Thunderstorm Warning | BOX | Cheshire, Hillsborough | 56 min |
| Sep 18, 8:52 PM EDT | Areal Flood Advisory | BOX | Cheshire, Hillsborough | 5 hr |
| Sep 18, 10:16 PM EDT | Severe Thunderstorm Warning | BOX | Hillsborough | 59 min |
| Sep 18, 11:16 PM EDT | Severe Thunderstorm Warning | BOX | Hillsborough | 59 min |
| Sep 19, 3:41 AM EDT | Frost Advisory | BOX | Cheshire | 28 hr |
Nearby
Severe Thunderstorm Warnings in New Hampshire, 2012Every severe thunderstorm warning in 2012
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.