Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 24, NWS New York, NY

June 9, 2021Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Connecticut

NWS New York, NY issued this severe thunderstorm warning at Jun 9, 2021, 5:11 PM EDT for Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Connecticut. It was in force for 49 min. 4 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 9, 2021, 5:11 PM EDT (21:11 UTC)
Expired: Jun 9, 2021, 6:00 PM EDT
In force: 49 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Lower Connecticut River Valley Planning Region, CT, Naugatuck Valley Planning Region, CT

The radar

The Brookhaven radar (KOKX), 54 km from the middle of the area, began a volume at 21:11 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 9, 5:12 PM EDT	TSTM WND DMG	3 Ene Durham, CT	TREE AND BRANCHES REPORTED DOWN IN FRONT OF 15 FOOT HILLS ROAD JUST PAST MILBROOK ROAD.
Jun 9, 5:22 PM EDT	TSTM WND DMG	Durham, CT	REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
Jun 9, 5:54 PM EDT	TSTM WND DMG	1 Nw Guilford, CT	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Jun 9, 5:54 PM EDT	TSTM WND DMG	Guilford, CT	MULTIPLE TREES REPORTED DOWN IN GUILFORD WITH TIME ESTIMATED BY RADAR.

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, 9.2 hours before the alert went out and 54 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: 556 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

380 
WUUS51 KOKX 092111
SVROKX
CTC007-009-092200-
/O.NEW.KOKX.SV.W.0024.210609T2111Z-210609T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
511 PM EDT Wed Jun 9 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Eastern New Haven County in southern Connecticut...
  Middlesex County in southern Connecticut...

* Until 600 PM EDT.

* At 510 PM EDT, a severe thunderstorm was located over Durham,
  moving south at 20 mph.

  HAZARD...60 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and power lines.

* This severe thunderstorm will be near...
  Durham around 515 PM EDT.
  Guilford, North Branford and Killingworth around 525 PM EDT.
  Westbrook and North Madison around 540 PM EDT.
  Clinton around 550 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4125 7246 4124 7254 4126 7259 4123 7276
      4125 7278 4124 7280 4157 7276 4157 7252
TIME...MOT...LOC 2110Z 359DEG 18KT 4150 7264 

HAIL...0.88IN
WIND...60MPH
 
$$

Goodman

2 follow-up statements

919 
WWUS51 KOKX 092131
SVSOKX

Severe Weather Statement
National Weather Service New York NY
531 PM EDT Wed Jun 9 2021

CTC007-009-092200-
/O.CON.KOKX.SV.W.0024.000000T0000Z-210609T2200Z/
New Haven CT-Middlesex CT-
531 PM EDT Wed Jun 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHEASTERN NEW HAVEN AND SOUTHERN MIDDLESEX COUNTIES...

At 530 PM EDT, a severe thunderstorm was located near North Madison,
or near Durham, moving south at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Minor hail damage to vehicles is possible. Expect wind 
         damage to trees and power lines.

Locations impacted include...
Wallingford, Guilford, Clinton, Durham, Chester, Branford, North
Branford, Haddam, Westbrook, Killingworth, North Madison, Madison and
Deep River.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4125 7246 4124 7254 4126 7259 4123 7276
      4125 7278 4124 7280 4148 7277 4148 7250
TIME...MOT...LOC 2130Z 357DEG 16KT 4141 7264 

HAIL...1.00IN
WIND...60MPH
 
$$

Goodman

279 
WWUS51 KOKX 092138
SVSOKX

Severe Weather Statement
National Weather Service New York NY
538 PM EDT Wed Jun 9 2021

CTC007-009-092200-
/O.CON.KOKX.SV.W.0024.000000T0000Z-210609T2200Z/
New Haven CT-Middlesex CT-
538 PM EDT Wed Jun 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHEASTERN NEW HAVEN AND SOUTHERN MIDDLESEX COUNTIES...

At 537 PM EDT, severe thunderstorms were located along a line
extending from North Madison to North Branford, moving south at 10
mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Trained weather spotters.

IMPACT...Minor hail damage to vehicles is possible. Expect wind 
         damage to trees and power lines.

Locations impacted include...
Wallingford, Guilford, Clinton, Chester, Branford, North Branford,
Westbrook, Killingworth, North Madison, Madison and Deep River.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4141 7249 4125 7246 4124 7254 4126 7259
      4123 7276 4125 7278 4124 7280 4143 7278
TIME...MOT...LOC 2137Z 347DEG 7KT 4135 7261 4138 7276 

HAIL...1.25IN
WIND...60MPH
 
$$

Goodman

The office that day

Everything else NWS New York, NY issued on the same UTC day.

Issued	Product	Office	Lasted
Jun 9, 4:19 PM EDT	Special Weather Statement	OKX	41 min
Jun 9, 4:53 PM EDT	Special Weather Statement	OKX	52 min
Jun 9, 6:00 PM EDT	Special Weather Statement	OKX	15 min
Jun 9, 7:36 PM EDT	Special Weather Statement	OKX	39 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2021 Every severe thunderstorm warning in 2021

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.