Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 5, NWS Boston/Norton, MA

May 16, 2012Cheshire County, Hillsborough County, New Hampshire

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 16, 2012, 8:23 PM EDT for Cheshire County, Hillsborough County, New Hampshire. It was in force for 31 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
May 16, 2012, 8:23 PM EDT (00:23 UTC)
Expired
May 16, 2012, 8:54 PM EDT
In force
31 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Cheshire County, NH, Hillsborough County, NH

The radar

The Boston radar (KBOX), 135 km from the middle of the area, began a volume at 00:23 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 16, 1:18 PM EDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 0.4 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 00:00Z on 2012-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Gray, ME at 00:00Z on 2012-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.1939587897Sfc1 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
27 J/kg
Mixed-layer CIN
-163 J/kg
Mixed-layer LCL
769 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
125 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.

949 
WUUS51 KBOX 170023
SVRBOX
NHC005-011-170115-
/O.NEW.KBOX.SV.W.0005.120517T0023Z-120517T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
823 PM EDT WED MAY 16 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CHESHIRE COUNTY IN SOUTHERN NEW HAMPSHIRE...
  NORTHERN HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...

* UNTIL 915 PM EDT

* AT 819 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HILLSBOROUGH...OR 7 MILES WEST OF HENNIKER...AND WAS MOVING EAST AT
  30 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...DEERING...WEARE AND
  GOFFSTOWN.

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 4312 7185 4315 7167 4306 7164 4307 7152
      4305 7150 4305 7146 4302 7144 4302 7141
      4299 7140 4304 7205 4313 7206 4315 7203
      4318 7204 4321 7191
TIME...MOT...LOC 0023Z 268DEG 26KT 4315 7192

$$

NMB
1 follow-up statement
279 
WWUS51 KBOX 170054
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
854 PM EDT WED MAY 16 2012

NHC005-011-170102-
/O.CAN.KBOX.SV.W.0005.000000T0000Z-120517T0115Z/
CHESHIRE NH-HILLSBOROUGH NH-
854 PM EDT WED MAY 16 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN HILLSBOROUGH AND
NORTHEASTERN CHESHIRE COUNTIES IS CANCELLED...

AT 852 PM...THE THUNDERSTORM THAT WAS CROSSING OVER NORTHERN 
HILLSBOROUGH COUNTY HAD WEAKENED. RADAR NO LONGER INDICATES THAT THE 
STORM IS SEVERE. HOWEVER...SMALL HAIL AND WIND GUSTS TO 40 MPH WILL 
STILL BE POSSIBLE AS THE STORM TRACKS THROUGH FAR NORTHERN 
HILLSBOROUGH COUNTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR NORTHERN CONNECTICUT AND SOUTHERN MASSACHUSETTS
AND SOUTHERN NEW HAMPSHIRE.

LAT...LON 4312 7185 4315 7167 4306 7164 4307 7152
      4305 7150 4305 7146 4302 7144 4302 7141
      4299 7140 4304 7205 4313 7206 4315 7203
      4318 7204 4321 7191
TIME...MOT...LOC 0052Z 268DEG 26KT 4316 7163

$$

NMB

The office that day

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

IssuedProductOfficeCountiesLasted
May 16, 8:09 PM EDTSpecial Weather StatementBOXCheshire66 min
May 16, 8:13 PM EDTSpecial Weather StatementBOXHillsborough47 min
May 16, 8:23 PM EDTSevere Thunderstorm WarningBOXCheshire52 min
May 17, 3:37 AM EDTFrost AdvisoryBOXCheshire, Hillsborough27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.