Alert archive / Connecticut / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 39, NWS Boston/Norton, MA

June 30, 2009Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 30, 2009, 8:24 PM EDT for Capitol Planning Region, Connecticut. It was in force for 36 min. 5 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: Jun 30, 2009, 8:24 PM EDT (00:24 UTC)
Expired: Jun 30, 2009, 9:00 PM EDT
In force: 36 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

County Capitol Planning Region, CT

The radar

The Boston radar (KBOX), 120 km from the middle of the area, began a volume at 00:25 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
Jun 30, 8:35 PM EDT	TSTM WND DMG	South Windsor, CT	LARGE LIMBS DOWN ON WIRES
Jun 30, 8:37 PM EDT	TSTM WND DMG	Ellington, CT	STREET SIGN BLOWN DOWN
Jun 30, 8:40 PM EDT	TSTM WND DMG	Windsor Locks, CT	LARGE LIMBS DOWN ON WIRES
Jun 30, 8:40 PM EDT	HAIL 1	Enfield, CT
Jun 30, 8:43 PM EDT	HAIL 0.88	East Windsor, CT	BROAD BROOK - SMALLER HAIL MIXED IN WITH THE NICKEL HAIL

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 00:00Z, 0.4 hours before the alert went out and 122 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: 1404 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 712 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: -31 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KBOX 010024
SVRBOX
CTC003-013-010100-
/O.NEW.KBOX.SV.W.0039.090701T0024Z-090701T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
824 PM EDT TUE JUN 30 2009

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITIES OF...WINDSOR LOCKS...WEST HARTFORD...
  MANCHESTER...HARTFORD...EAST HARTFORD...
  NORTHWESTERN TOLLAND COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF VERNON...

* UNTIL 900 PM EDT

* AT 824 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HARTFORD...AND MOVING NORTHEAST AT 30 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE... BLOOMFIELD...SOUTH
  WINDSOR...WINDSOR...EAST WINDSOR...SUFFIELD...ELLINGTON...
  ENFIELD...TOLLAND AND SOMERS

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...IN
ADDITION TO DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR SAFETY GO
INDOORS NOW AND STAY AWAY FROM WINDOWS. MINOR POOR DRAINAGE FLOODING
IS ALSO EXPECTED. DRIVERS SHOULD AVOID FLOODED ROADWAYS.

LAT...LON 4203 7265 4203 7261 4202 7259 4203 7257
      4203 7251 4194 7229 4164 7263 4174 7283
TIME...MOT...LOC 0024Z 215DEG 24KT 4177 7266

$$

KJC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:14 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	74 min
Jun 30, 8:42 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	33 min
Jun 30, 8:51 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	78 min
Jul 1, 4:54 AM EDT	Flash Flood Watch	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	42 hr
Jul 1, 10:57 AM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	3 hr
Jul 1, 1:11 PM EDT	Flash Flood Warning	BOX	Northeastern Connecticut Planning Region	6 hr
Jul 1, 2:09 PM EDT	Areal Flood Warning	BOX	Northeastern Connecticut Planning Region	3 hr

Nearby

Severe Thunderstorm Warnings in Connecticut, 2009 Every severe thunderstorm warning in 2009

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.