Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 44, NWS New York, NY

July 7, 2021Lower Connecticut River Valley Planning Region, Southeastern Connecticut Planning Region, Connecticut

NWS New York, NY issued this severe thunderstorm warning at Jul 7, 2021, 7:13 PM EDT for Lower Connecticut River Valley Planning Region, Southeastern Connecticut Planning Region, Connecticut. It was in force for 51 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 7, 2021, 7:13 PM EDT (23:13 UTC)
Expired: Jul 7, 2021, 8:04 PM EDT
In force: 51 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Boston radar (KBOX), 94 km from the middle of the area, began a volume at 23:13 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 7, 2:41 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.2 hours before the alert went out and 95 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: 568 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 901 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

352 
WUUS51 KOKX 072313
SVROKX
CTC007-011-080015-
/O.NEW.KOKX.SV.W.0044.210707T2313Z-210708T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
713 PM EDT Wed Jul 7 2021

The National Weather Service in Upton NY has issued a

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

* Until 815 PM EDT.

* At 713 PM EDT, severe thunderstorms were located along a line
  extending from Sprague to Lyme, moving east at 30 mph.

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

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Norwich and Preston around 720 PM EDT.
  Jewett City and Waterford around 725 PM EDT.
  Voluntown around 735 PM EDT.
  New London and Groton around 740 PM EDT.
  Ledyard Center around 745 PM EDT.
  Mystic around 750 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4142 7180 4141 7184 4134 7183 4132 7185
      4133 7189 4129 7200 4130 7216 4127 7220
      4127 7224 4138 7258 4168 7220 4166 7216
      4166 7214 4163 7196 4164 7179
TIME...MOT...LOC 2313Z 279DEG 28KT 4164 7209 4140 7236 

HAIL...0.75IN
WIND...60MPH
 
$$

NV

1 follow-up statement

141 
WWUS51 KOKX 080004
SVSOKX

Severe Weather Statement
National Weather Service New York NY
804 PM EDT Wed Jul 7 2021

CTC007-011-080014-
/O.CAN.KOKX.SV.W.0044.000000T0000Z-210708T0015Z/
New London CT-Middlesex CT-
804 PM EDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NEW LONDON AND SOUTHERN
MIDDLESEX COUNTIES IS CANCELLED...
    
The storms which prompted the warning have weakened below severe 
limits, and will exit the warned area shortly. Therefore, the 
warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
southern Connecticut.

LAT...LON 4142 7180 4141 7184 4134 7183 4132 7185
      4133 7189 4129 7200 4130 7216 4127 7220
      4127 7224 4138 7258 4168 7220 4166 7216
      4166 7214 4163 7196 4164 7179
TIME...MOT...LOC 0003Z 279DEG 28KT 4158 7157 4134 7184 

$$

NV

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 4:28 PM EDT	Flash Flood Watch	OKX	Greater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	44 hr
Jul 7, 5:35 PM EDT	Special Weather Statement	OKX		25 min
Jul 7, 5:43 PM EDT	Severe Thunderstorm Warning	OKX	Lower Connecticut River Valley Planning Region, Southeastern Connecticut Planning Region	47 min
Jul 7, 5:43 PM EDT	Tropical Storm Watch	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	12 hr
Jul 7, 6:26 PM EDT	Special Weather Statement	OKX		49 min
Jul 7, 6:54 PM EDT	Special Weather Statement	OKX		36 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.