Alert archive / Connecticut / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 93, NWS Boston/Norton, MA

August 1, 2011Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 1, 2011, 4:35 PM EDT for Capitol Planning Region, Connecticut. It was in force for 24 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 1, 2011, 4:35 PM EDT (20:35 UTC)
Expired: Aug 1, 2011, 4:59 PM EDT
In force: 24 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

County Capitol Planning Region, CT

The radar

The Brookhaven radar (KOKX), 89 km from the middle of the area, began a volume at 20:37 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.

Issued	Product	Office	Lasted
Aug 1, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.6 hours before the alert went out and 89 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: 529 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 975 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

867 
WUUS51 KBOX 012035
SVRBOX
CTC003-012115-
/O.NEW.KBOX.SV.W.0093.110801T2035Z-110801T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
435 PM EDT MON AUG 1 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF BRISTOL...

* UNTIL 515 PM EDT

* AT 430 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
  BURLINGTON...OR 7 MILES NORTHWEST OF BRISTOL...AND WAS MOVING
  SOUTHEAST AT 15 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...PLAINVILLE...FARMINGTON AND
  SOUTHINGTON.

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.

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

&&

LAT...LON 4181 7296 4172 7276 4155 7287 4155 7293
      4157 7295 4159 7294 4164 7294 4164 7298
      4164 7299 4180 7302
TIME...MOT...LOC 2035Z 299DEG 14KT 4174 7301

$$

JWD

1 follow-up statement

606 
WWUS51 KBOX 012059
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
459 PM EDT MON AUG 1 2011

CTC003-012109-
/O.CAN.KBOX.SV.W.0093.000000T0000Z-110801T2115Z/
HARTFORD CT-
459 PM EDT MON AUG 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HARTFORD COUNTY
IS CANCELLED...

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

LAT...LON 4181 7296 4172 7276 4155 7287 4155 7293
      4157 7295 4159 7294 4164 7294 4164 7298
      4164 7299 4180 7302
TIME...MOT...LOC 2059Z 299DEG 14KT 4169 7290

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 2:13 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	47 min
Aug 1, 2:19 PM EDT	Flash Flood Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	116 min
Aug 1, 3:05 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	17 min
Aug 1, 3:41 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	49 min
Aug 1, 4:00 PM EDT	Special Weather Statement	BOX		45 min
Aug 1, 4:15 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	3 hr
Aug 1, 4:18 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	29 min
Aug 1, 4:45 PM EDT	Special Weather Statement	BOX		45 min
Aug 1, 5:10 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	35 min
Aug 1, 6:03 PM EDT	Special Weather Statement	BOX		42 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2011 Every severe thunderstorm warning in 2011

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.