Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 68, NWS Boston/Norton, MA

August 4, 2012Hillsborough County, New Hampshire

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 4, 2012, 3:47 PM EDT for Hillsborough County, New Hampshire. It was in force for 43 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
Aug 4, 2012, 3:47 PM EDT (19:47 UTC)
Expired
Aug 4, 2012, 4:30 PM EDT
In force
43 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

County Hillsborough County, NH

The radar

The Boston radar (KBOX), 138 km from the middle of the area, began a volume at 19:47 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, 7.8 hours before the alert went out and 148 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-pSkew-T log-p diagram, Gray, ME at 12:00Z on 2012-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Gray, ME at 12:00Z on 2012-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
18 J/kg
Mixed-layer CIN
-285 J/kg
Mixed-layer LCL
1552 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
102 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.

296 
WUUS51 KBOX 041947
SVRBOX
NHC011-042030-
/O.NEW.KBOX.SV.W.0068.120804T1947Z-120804T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
347 PM EDT SAT AUG 4 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...

* UNTIL 430 PM EDT

* AT 343 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. 
  THIS STORM WAS LOCATED NEAR WEARE...OR 6 MILES SOUTH OF
  HENNIKER...AND WAS MOVING NORTHEAST AT 10 MPH. TORRENTIAL RAINFALL
  ALSO ACCOMPANIES THIS STORM.

* TOWNS IN THE WARNING INCLUDE WEARE AND HILLSBOROUGH.
 
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 4315 7167 4303 7175 4308 7184 4312 7185
      4312 7184 4315 7168
TIME...MOT...LOC 1945Z 208DEG 7KT 4310 7178

$$
FIELD
1 follow-up statement
648 
WWUS51 KBOX 042010
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
410 PM EDT SAT AUG 4 2012

NHC011-042030-
/O.CON.KBOX.SV.W.0068.000000T0000Z-120804T2030Z/
HILLSBOROUGH NH-
410 PM EDT SAT AUG 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTH CENTRAL HILLSBOROUGH COUNTY...

AT 406 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
HAIL OVER WEARE...OR 7 MILES SOUTHEAST OF HENNIKER...MOVING 
NORTHEAST AT 5 MPH. GUSTY WINDS...TORRENTIAL RAINFALL...AND FREQUENT
CLOUD TO GROUND LIGHTNING ALSO ACCOMPANY THIS STORM.

AT 356 PM...AN AMATEUR RADIO OPERATOR IN WEARE REPORTED 40 MPH 
WINDS...SMALL BRANCHES DOWN...AND PEA SIZE HAIL ON CRANEY HILL ROAD 
IN WEARE.

LAT...LON 4306 7176 4307 7179 4309 7180 4311 7179
      4315 7168 4315 7167 4307 7172
TIME...MOT...LOC 2007Z 217DEG 6KT 4311 7174

$$
FIELD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 1:57 PM EDTSpecial Weather StatementBOXHillsborough48 min
Aug 4, 2:43 PM EDTSpecial Weather StatementBOXHillsborough32 min
Aug 4, 3:36 PM EDTSpecial Weather StatementBOXHillsborough39 min
Aug 4, 3:59 PM EDTAreal Flood AdvisoryBOXHillsborough3 hr
Aug 4, 4:43 PM EDTAreal Flood AdvisoryBOXHillsborough3 hr
Aug 4, 5:06 PM EDTSpecial Weather StatementBOXHillsborough54 min
Aug 4, 5:28 PM EDTSpecial Weather StatementBOXHillsborough32 min
Aug 4, 6:02 PM EDTAreal Flood AdvisoryBOXCheshire, Hillsborough3 hr
Aug 4, 7:07 PM EDTSpecial Weather StatementBOXHillsborough53 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.