Alert archive / Connecticut / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 71, NWS Boston/Norton, MA

August 5, 2012Capitol Planning Region, Connecticut; Hampden County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 5, 2012, 4:20 PM EDT for Capitol Planning Region, Connecticut; Hampden County, Massachusetts. It was in force for 40 min. 6 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 5, 2012, 4:20 PM EDT (20:20 UTC)
Expired: Aug 5, 2012, 5:00 PM EDT
In force: 40 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Capitol Planning Region, CT, Hampden County, MA

The radar

The Brookhaven radar (KOKX), 115 km from the middle of the area, began a volume at 20:21 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 5, 4:45 PM EDT	TSTM WND DMG	Granby, CT	TREE DOWN BLOCKING A ROAD
Aug 5, 4:55 PM EDT	TSTM WND DMG	Enfield, CT	ALUMINUM SIDING BLOWN OFF TWO HOMES ON GLEN ARDEN LANE.
Aug 5, 4:56 PM EDT	TSTM WND DMG	Agawam, MA	TREE AND WIRES DOWN AT BARN RD AND ROWLEY ST. TREE DOWN ON SUFFIELD ST.
Aug 5, 4:58 PM EDT	TSTM WND DMG	Simsbury, CT	LARGE TREE DOWN BLOCKING ROUTE 167
Aug 5, 5:10 PM EDT	TSTM WND DMG	Longmeadow, MA	LARGE LIMBS DOWN AT WESTERN ST AND CLAREMONT ST. TREE DOWN AT WOODLAWN AND SOUTH PARK RD
Aug 5, 5:10 PM EDT	TSTM WND DMG	South Windsor, CT	TREE AND WIRES DOWN AT SULLVAN ST AND PIERCE ST

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.3 hours before the alert went out and 115 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: 2201 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 477 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 3 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.

520 
WUUS51 KBOX 052020
SVRBOX
CTC003-013-MAC013-052100-
/O.NEW.KBOX.SV.W.0071.120805T2020Z-120805T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
420 PM EDT SUN AUG 5 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF WINDSOR LOCKS...
  NORTHWESTERN TOLLAND COUNTY IN NORTHERN CONNECTICUT...
  SOUTH CENTRAL HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 500 PM EDT

* AT 415 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM SOUTHWICK AND SIMSBURY TO BURLINGTON.  THE LINE WAS MOVING 
  EAST AT 30 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...CANTON...GRANBY...AVON...
  EAST GRANBY...SUFFIELD...AGAWAM...BLOOMFIELD...LONGMEADOW...
  ENFIELD...WINDSOR...EAST LONGMEADOW...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 4181 7295 4188 7295 4190 7294 4190 7292
      4197 7290 4197 7292 4206 7290 4210 7247
      4195 7248 4179 7263 4175 7301 4180 7302
TIME...MOT...LOC 2019Z 264DEG 24KT 4205 7287 4192 7289
          4181 7299

$$

WTB

1 follow-up statement

853 
WWUS51 KBOX 052041
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
441 PM EDT SUN AUG 5 2012

CTC003-013-MAC013-052100-
/O.CON.KBOX.SV.W.0071.000000T0000Z-120805T2100Z/
HARTFORD CT-TOLLAND CT-HAMPDEN MA-
441 PM EDT SUN AUG 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR SOUTH CENTRAL HAMPDEN...NORTHWESTERN TOLLAND AND NORTHERN
HARTFORD COUNTIES...

AT 436 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM SOUTHWICK TO EAST GRANBY TO AVON...MOVING EAST AT 30 
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SUFFIELD...AGAWAM...BLOOMFIELD...LONGMEADOW...ENFIELD...WINDSOR...
EAST LONGMEADOW...SOUTH WINDSOR AND EAST WINDSOR

LAT...LON 4181 7295 4188 7295 4190 7294 4190 7292
      4197 7290 4197 7292 4206 7290 4210 7247
      4195 7248 4179 7263 4175 7301 4180 7302
TIME...MOT...LOC 2040Z 264DEG 24KT 4206 7268 4193 7270
          4182 7280

$$

WTB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 4:03 AM EDT	Flash Flood Watch	BOX	Capitol Planning Region	19 hr
Aug 5, 2:02 PM EDT	Special Weather Statement	BOX		58 min
Aug 5, 2:29 PM EDT	Special Weather Statement	BOX		61 min
Aug 5, 3:33 PM EDT	Special Weather Statement	BOX		57 min
Aug 5, 4:58 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	47 min
Aug 5, 5:05 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	40 min
Aug 5, 5:13 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	3 hr
Aug 5, 5:46 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	29 min
Aug 5, 5:57 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	3 hr
Aug 5, 6:30 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	18 min
Aug 5, 7:52 PM EDT	Special Weather Statement	BOX		83 min
Aug 5, 4:08 AM EDT	Small Craft Advisory	BOX		27 hr
Aug 5, 3:03 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	42 min
Aug 5, 4:38 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	47 min
Aug 5, 5:30 PM EDT	Special Marine Warning	BOX		51 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2012 Severe Thunderstorm Warnings in Massachusetts, 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.