Alert archive / Connecticut / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 21, NWS Boston/Norton, MA

May 29, 2010

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 29, 2010, 4:26 PM EDT. It was in force for 49 min. 2 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: May 29, 2010, 4:26 PM EDT (20:26 UTC)
Expired: May 29, 2010, 5:15 PM EDT
In force: 49 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

The radar

The Boston radar (KBOX), 100 km from the middle of the area, began a volume at 20:27 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
May 29, 5:04 PM EDT	HAIL 1	1 Se Tolland, CT	MERROW ROAD
May 29, 5:25 PM EDT	HAIL 1	2 S Coventry, CT	SOUTH COVENTRY

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, 8.4 hours before the alert went out and 125 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 65 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.

772 
WUUS51 KBOX 292026
SVRBOX
CTC013-292115-
/O.NEW.KBOX.SV.W.0021.100529T2026Z-100529T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
426 PM EDT SAT MAY 29 2010

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  TOLLAND COUNTY IN NORTHERN CONNECTICUT...

* UNTIL 515 PM EDT

* AT 423 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
  SOMERS...OR 10 MILES SOUTHEAST OF SPRINGFIELD...AND WAS MOVING
  SOUTHEAST AT 20 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...TOLLAND...WILLINGTON AND
  COVENTRY.

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 4195 7223 4170 7229 4196 7249 4203 7246
TIME...MOT...LOC 2026Z 316DEG 16KT 4197 7243

$$
EKSTER

2 follow-up statements

604 
WWUS51 KBOX 292053
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
453 PM EDT SAT MAY 29 2010

CTC013-292115-
/O.CON.KBOX.SV.W.0021.000000T0000Z-100529T2115Z/
TOLLAND CT-
453 PM EDT SAT MAY 29 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR CENTRAL TOLLAND COUNTY...

AT 448 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR TOLLAND...OR 6 MILES NORTHWEST OF MANSFIELD...MOVING
SOUTHEAST AT 20 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WILLINGTON AND COVENTRY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4197 7237 4190 7225 4170 7229 4189 7244
TIME...MOT...LOC 2054Z 325DEG 18KT 4186 7233

$$
EKSTER

203 
WWUS51 KBOX 292112
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
512 PM EDT SAT MAY 29 2010

CTC013-292122-
/O.EXP.KBOX.SV.W.0021.000000T0000Z-100529T2115Z/
TOLLAND CT-
512 PM EDT SAT MAY 29 2010

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TOLLAND COUNTY WILL
EXPIRE AT 515 PM EDT...

LAT...LON 4197 7237 4190 7225 4170 7229 4189 7244
TIME...MOT...LOC 2112Z 325DEG 18KT 4179 7226

$$
EKSTER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 4:05 PM EDT	Special Weather Statement	BOX		40 min
May 29, 4:11 PM EDT	Special Weather Statement	BOX		49 min
May 29, 5:11 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	39 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2010 Every severe thunderstorm warning in 2010

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.