Alert archive / Connecticut / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 97, NWS Boston/Norton, MA

August 17, 2012Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 17, 2012, 9:06 PM EDT for Capitol Planning Region, Connecticut. It was in force for 39 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 17, 2012, 9:06 PM EDT (01:06 UTC)
Expired
Aug 17, 2012, 9:45 PM EDT
In force
39 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

County Capitol Planning Region, CT

The radar

The Brookhaven radar (KOKX), 106 km from the middle of the area, began a volume at 01:07 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

Brookhaven, NY (KOKX), launched 00:00Z, 1.1 hours before the alert went out and 106 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, Brookhaven, NY at 00:00Z on 2012-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 294 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, Brookhaven, NY at 00:00Z on 2012-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
294 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1319 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

680 
WUUS51 KBOX 180106
SVRBOX
CTC003-180145-
/O.NEW.KBOX.SV.W.0097.120818T0106Z-120818T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
906 PM EDT FRI AUG 17 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITIES OF...WEST HARTFORD...NEWINGTON...NEW
  BRITAIN...MANCHESTER...HARTFORD...EAST HARTFORD...

* UNTIL 945 PM EDT

* AT 904 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
  FARMINGTON AND WAS MOVING EAST AT 25 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...BLOOMFIELD...
  WETHERSFIELD...GLASTONBURY...WINDSOR...SOUTH WINDSOR AND EAST
  WINDSOR.

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 4177 7288 4191 7251 4186 7252 4186 7250
      4181 7251 4181 7247 4172 7246 4166 7281
TIME...MOT...LOC 0106Z 248DEG 21KT 4172 7278

$$

JWD
2 follow-up statements
480 
WWUS51 KBOX 180120
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
920 PM EDT FRI AUG 17 2012

CTC003-180145-
/O.CON.KBOX.SV.W.0097.000000T0000Z-120818T0145Z/
HARTFORD CT-
920 PM EDT FRI AUG 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR CENTRAL HARTFORD COUNTY...

AT 918 PM...THE SEVERE THUNDERSTORM WAS LOCATED NEAR HARTFORD AND 
WAS MOVING EAST AT 25 MPH. THIS STORM IS CAPABLE OF PRODUCING 60 MPH 
WIND GUSTS AND QUARTER SIZED HAIL.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO EAST 
HARTFORD...SOUTH WINDSOR...EAST WINDSOR AND MANCHESTER.

GET INDOORS NOW IF YOU ARE IN THE PATH OF THIS STORM. DRIVERS SHOULD 
BE PREPARED FOR MINOR STREET FLOODING AND AVOID AREAS WHERE WATER 
COVERS THE ROAD.

&&

LAT...LON 4191 7251 4186 7252 4186 7251 4181 7251
      4181 7248 4180 7247 4172 7246 4170 7271
      4179 7278
TIME...MOT...LOC 0119Z 248DEG 21KT 4175 7269

$$

JWD
463 
WWUS51 KBOX 180138
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
938 PM EDT FRI AUG 17 2012

CTC003-180147-
/O.EXP.KBOX.SV.W.0097.000000T0000Z-120818T0145Z/
HARTFORD CT-
938 PM EDT FRI AUG 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL HARTFORD COUNTY WILL
EXPIRE AT 945 PM EDT...

AT 937 PM...THE SEVERE THUNDERSTORM WAS MOVING THROUGH EAST HARTFORD 
AND WAS WEAKENING. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

THIS STORM WAS CAUSING MINOR STREET AND HIGHWAY FLOODING. DRIVERS 
SHOULD BE ALERT FOR PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 4191 7251 4186 7252 4186 7251 4181 7251
      4181 7248 4180 7247 4172 7246 4170 7271
      4179 7278
TIME...MOT...LOC 0137Z 248DEG 21KT 4179 7256

$$

JWD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 9:47 PM EDTSpecial Weather StatementBOX58 min
Aug 17, 10:16 PM EDTSpecial Weather StatementBOX44 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 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.