Alert archive / Connecticut / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 121, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 21, 2011, 3:40 PM EDT for Capitol Planning Region, Connecticut. It was in force for 35 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 21, 2011, 3:40 PM EDT (19:40 UTC)
- Expired
- Aug 21, 2011, 4:15 PM EDT
- In force
- 35 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
County Capitol Planning Region, CT
The radar
The Brookhaven radar (KOKX), 108 km from the middle of the area, began a volume at 19:44 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 21, 3:52 PM EDT | TSTM WND DMG | Hartford, CT | LARGE TREE DOWN ON HOUSE ON PLINY STREET |
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 21, 1:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 7.7 hours before the alert went out and 108 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.
- Mixed-layer CAPE
- 874 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 857 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
259
WUUS51 KBOX 211940
SVRBOX
CTC003-212015-
/O.NEW.KBOX.SV.W.0121.110821T1940Z-110821T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
340 PM EDT SUN AUG 21 2011
THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL HARTFORD COUNTY IN NORTHERN CONNECTICUT...
THIS INCLUDES THE CITIES OF...WEST HARTFORD...NEWINGTON...NEW
BRITAIN...MANCHESTER...HARTFORD...EAST HARTFORD...
* UNTIL 415 PM EDT
* AT 334 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 NEAR FARMINGTON...OR NEAR
BRISTOL...AND WAS MOVING EAST AT 30 MPH.
* SOME LOCATIONS IN THE WARNING INCLUDE...AVON...BLOOMFIELD...
WETHERSFIELD...ROCKY HILL...GLASTONBURY...WINDSOR...SOUTH WINDSOR
AND EAST WINDSOR.
IN ADDITION FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. GET
INDOORS OR INSIDE A VEHICLE NOW! DO NOT SEEK SHELTER UNDER TREES. IF
YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT SUNDAY
EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND SOUTHERN NEW
HAMPSHIRE.
&&
LAT...LON 4183 7294 4197 7250 4195 7249 4194 7251
4186 7252 4186 7250 4181 7251 4181 7248
4180 7247 4168 7245 4166 7243 4166 7292
4181 7297
TIME...MOT...LOC 1939Z 253DEG 26KT 4174 7284
$$
SIPPRELL2 follow-up statements
605
WWUS51 KBOX 211953
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
353 PM EDT SUN AUG 21 2011
CTC003-212015-
/O.CON.KBOX.SV.W.0121.000000T0000Z-110821T2015Z/
HARTFORD CT-
353 PM EDT SUN AUG 21 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR CENTRAL HARTFORD COUNTY...
AT 351 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WEST HARTFORD...MOVING
EAST AT 30 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WETHERSFIELD...HARTFORD...ROCKY HILL...GLASTONBURY...EAST HARTFORD...
WINDSOR...SOUTH WINDSOR...EAST WINDSOR AND MANCHESTER
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...AND DEADLY CLOUD TO GROUND
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT SUNDAY
EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND SOUTHERN NEW
HAMPSHIRE.
&&
LAT...LON 4197 7250 4195 7249 4194 7251 4186 7252
4181 7251 4181 7248 4180 7247 4168 7245
4167 7244 4166 7244 4166 7260 4166 7276
4185 7287
TIME...MOT...LOC 1953Z 253DEG 26KT 4177 7271
$$
SIPPRELL405
WWUS51 KBOX 212009
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
409 PM EDT SUN AUG 21 2011
CTC003-212018-
/O.EXP.KBOX.SV.W.0121.000000T0000Z-110821T2015Z/
HARTFORD CT-
409 PM EDT SUN AUG 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL HARTFORD COUNTY WILL
EXPIRE AT 415 PM EDT...
THE THUNDERSTORM HAS WEAKENED ACROSS THE WARNED AREA. LOCATIONS
WITHIN AND TO THE EAST OF EAST-CENTRAL HARTFORD COUNTY CAN EXPECT
HEAVY RAINS...FREQUENT LIGHTNING...AND GUSTY WINDS UP TO 30 MPH WITH
THIS STORM.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT SUNDAY
EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND SOUTHERN NEW
HAMPSHIRE.
LAT...LON 4197 7250 4195 7249 4194 7251 4186 7252
4181 7251 4181 7248 4180 7247 4168 7245
4167 7244 4166 7244 4166 7260 4166 7276
4185 7287
TIME...MOT...LOC 2008Z 253DEG 26KT 4180 7257
$$
SIPPRELLThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 1:39 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 66 min |
| Aug 21, 3:15 PM EDT | Special Weather Statement | BOX | 45 min |
Nearby
Severe Thunderstorm Warnings in Connecticut, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.