Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 39, NWS New York, NY

July 6, 2021Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Connecticut

NWS New York, NY issued this severe thunderstorm warning at Jul 6, 2021, 6:32 PM EDT for Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Connecticut. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 6, 2021, 6:32 PM EDT (22:32 UTC)
Expired: Jul 6, 2021, 6:59 PM EDT
In force: 27 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Brookhaven radar (KOKX), 62 km from the middle of the area, began a volume at 22:35 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 6, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.5 hours before the alert went out and 62 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: 230 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

457 
WUUS51 KOKX 062232
SVROKX
CTC007-009-011-062315-
/O.NEW.KOKX.SV.W.0039.210706T2232Z-210706T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
632 PM EDT Tue Jul 6 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Southern New London County in southern Connecticut...
  Southeastern New Haven County in southern Connecticut...
  Southern Middlesex County in southern Connecticut...

* Until 715 PM EDT.

* At 631 PM EDT, severe thunderstorms were located along a line
  extending from near Chester to near North Branford, moving east at
  30 mph.

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

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Chester around 635 PM EDT.
  Old Lyme and North Lyme around 640 PM EDT.
  Lyme around 645 PM EDT.
  Clinton and East Lyme around 650 PM EDT.
  Waterford around 655 PM EDT.
  Westbrook around 700 PM EDT.
  Groton around 705 PM EDT.
  New London and Old Saybrook around 710 PM EDT.
  Mystic around 715 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4132 7185 4133 7189 4131 7197 4125 7257
      4126 7259 4123 7273 4123 7276 4125 7278
      4123 7287 4132 7289 4146 7247 4134 7183
TIME...MOT...LOC 2231Z 273DEG 25KT 4137 7242 4132 7275 

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

Goodman

1 follow-up statement

536 
WWUS51 KOKX 062259
SVSOKX

Severe Weather Statement
National Weather Service New York NY
659 PM EDT Tue Jul 6 2021

CTC007-009-011-062308-
/O.CAN.KOKX.SV.W.0039.000000T0000Z-210706T2315Z/
New London CT-New Haven CT-Middlesex CT-
659 PM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN NEW LONDON...
SOUTHEASTERN NEW HAVEN AND SOUTHERN MIDDLESEX COUNTIES IS
CANCELLED...
    
The storms which prompted the warning have moved offshore. 
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 10 PM. 

LAT...LON 4132 7185 4133 7189 4131 7197 4125 7257
      4126 7259 4123 7273 4123 7276 4125 7278
      4123 7287 4132 7289 4146 7247 4134 7183
TIME...MOT...LOC 2257Z 273DEG 25KT 4136 7218 4131 7251 

$$

Goodman

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 4:54 PM EDT	Special Weather Statement	OKX		51 min
Jul 6, 5:35 PM EDT	Severe Thunderstorm Warning	OKX	Lower Connecticut River Valley Planning Region, Southeastern Connecticut Planning Region	40 min
Jul 6, 5:49 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region	56 min
Jul 6, 6:28 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region	47 min
Jul 6, 6:48 PM EDT	Areal Flood Advisory	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	3 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.