Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 91, NWS Boston/Norton, MA

August 11, 2012Cheshire County, New Hampshire

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 11, 2012, 6:19 PM EDT for Cheshire County, New Hampshire. It was in force for 41 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: Aug 11, 2012, 6:19 PM EDT (22:19 UTC)
Expired: Aug 11, 2012, 7:00 PM EDT
In force: 41 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

County Cheshire County, NH

The radar

The Albany radar (KENX), 138 km from the middle of the area, began a volume at 22:21 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
Aug 11, 6:25 PM EDT	TSTM WND DMG	Hinsdale, NH	TREE DOWN ON PLAIN ROAD
Aug 11, 6:30 PM EDT	TSTM WND DMG	Winchester, NH	TREE DOWN ON ASHUELOT STREET NEAR GEN. REED HWY...RT 119

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 12:00Z, 10.3 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.

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: 225 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 600 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

947 
WUUS51 KBOX 112219
SVRBOX
NHC005-112300-
/O.NEW.KBOX.SV.W.0091.120811T2219Z-120811T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
619 PM EDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHESHIRE COUNTY IN SOUTHERN NEW HAMPSHIRE...
  THIS INCLUDES THE CITY OF KEENE...

* UNTIL 700 PM EDT

* AT 618 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR HINSDALE...OR 7 MILES
  SOUTHEAST OF BRATTLEBORO...AND WAS MOVING NORTHEAST AT 20 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...WINCHESTER...
  CHESTERFIELD...RICHMOND...SWANZEY...TROY...SULLIVAN...ROXBURY AND
  MARLBOROUGH.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...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.

&&

LAT...LON 4306 7224 4285 7203 4272 7235 4273 7237
      4273 7246 4277 7250 4276 7251 4277 7252
      4278 7252 4281 7255 4286 7256
TIME...MOT...LOC 2220Z 236DEG 17KT 4277 7250

$$

KJC

1 follow-up statement

293 
WWUS51 KBOX 112301
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
701 PM EDT SAT AUG 11 2012

NHC005-112311-
/O.EXP.KBOX.SV.W.0091.000000T0000Z-120811T2300Z/
CHESHIRE NH-
701 PM EDT SAT AUG 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR CHESHIRE COUNTY HAS EXPIRED...

LAT...LON 4306 7224 4285 7203 4272 7235 4273 7237
      4273 7246 4277 7250 4276 7251 4277 7252
      4278 7252 4281 7255 4286 7256
TIME...MOT...LOC 2219Z 236DEG 17KT 4277 7250

$$

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 7:07 PM EDT	Areal Flood Advisory	BOX	Cheshire, Hillsborough	83 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2012 Every 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.