Alert archive / Connecticut / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 81, NWS Boston/Norton, MA

August 10, 2012Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 10, 2012, 4:00 PM EDT for Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 45 min. 1 report 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 10, 2012, 4:00 PM EDT (20:00 UTC)
Expired: Aug 10, 2012, 4:45 PM EDT
In force: 45 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT

The radar

The Brookhaven radar (KOKX), 102 km from the middle of the area, began a volume at 20:01 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 10, 4:55 PM EDT	TSTM WND DMG	Coventry, CT	TREE DOWN ON DUNN ROAD...ROAD CLOSED.

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

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 10, 3:31 PM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.0 hours before the alert went out and 102 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: 1737 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 539 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

719 
WUUS51 KBOX 102000
SVRBOX
CTC003-013-015-102045-
/O.NEW.KBOX.SV.W.0081.120810T2000Z-120810T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
400 PM EDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  SOUTHERN TOLLAND COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF MANSFIELD...
  SOUTHWESTERN WINDHAM COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF WILLIMANTIC...

* UNTIL 445 PM EDT

* AT 357 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 10 MILES SOUTH OF MARLBOROUGH...
  AND WAS MOVING NORTHEAST AT 35 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...HEBRON...COLUMBIA...ANDOVER
  AND COVENTRY.

A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCED WARNING. REMAIN CALM...BUT TAKE
COVER NOW. GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. AVOID WINDOWS.

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 TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY EVENING FOR
NORTHERN CONNECTICUT AND SOUTHEASTERN MASSACHUSETTS AND CENTRAL RHODE
ISLAND.

&&

LAT...LON 4188 7235 4179 7210 4168 7219 4171 7224
      4169 7226 4167 7227 4164 7233 4160 7232
      4160 7233 4159 7241 4158 7247 4163 7250
TIME...MOT...LOC 1959Z 208DEG 29KT 4150 7246

$$

WTB

1 follow-up statement

233 
WWUS51 KBOX 102026
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
426 PM EDT FRI AUG 10 2012

CTC003-013-015-102045-
/O.CON.KBOX.SV.W.0081.000000T0000Z-120810T2045Z/
HARTFORD CT-TOLLAND CT-WINDHAM CT-
426 PM EDT FRI AUG 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR WEST CENTRAL WINDHAM...SOUTHERN TOLLAND AND EXTREME SOUTHEASTERN
HARTFORD COUNTIES...

AT 423 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR HEBRON...OR 7 MILES
NORTH OF COLCHESTER...MOVING NORTHEAST AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
COLUMBIA...ANDOVER...WILLIMANTIC...COVENTRY...STORRS AND MANSFIELD

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY EVENING FOR
NORTHERN CONNECTICUT AND SOUTHEASTERN MASSACHUSETTS AND CENTRAL RHODE
ISLAND.

&&

LAT...LON 4188 7235 4179 7210 4168 7219 4171 7224
      4169 7226 4167 7227 4164 7233 4160 7232
      4160 7233 4159 7241 4158 7247 4163 7250
TIME...MOT...LOC 2025Z 208DEG 29KT 4168 7233

$$

WTB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 11:52 AM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	6 hr
Aug 10, 3:10 PM EDT	Special Weather Statement	BOX		50 min
Aug 10, 3:36 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	2 hr
Aug 10, 4:22 PM EDT	Tornado Warning	BOX	Capitol Planning Region	38 min
Aug 10, 4:45 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	45 min
Aug 10, 4:56 PM EDT	Flash Flood Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	2 hr
Aug 10, 4:57 PM EDT	Flash Flood Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	2 hr
Aug 10, 5:00 PM EDT	Tornado Warning	BOX	Capitol Planning Region	45 min
Aug 10, 5:31 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	44 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 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.