Alert archive / Connecticut / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 44, NWS New York, NY

July 27, 2023Lower 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 27, 2023, 7:17 PM EDT for Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Connecticut. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 27, 2023, 7:17 PM EDT (23:17 UTC)
Expired: Jul 27, 2023, 8:00 PM EDT
In force: 43 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, Naugatuck Valley Planning Region, CT, Southeastern Connecticut Planning Region, CT

The radar

The Brookhaven radar (KOKX), 74 km from the middle of the area, began a volume at 23:18 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 27, 12:48 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.3 hours before the alert went out and 74 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: 954 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New York, NY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 6:44 PM EDT, 33 minutes earlier.

Area forecast discussion, Jul 27, 6:44 PM EDT, 33 minutes before

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Hazardous weather outlook, Jul 27, 6:40 PM EDT, 37 minutes before

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In the hours before

Special weather statement, Jul 27, 5:55 PM EDT, 1 hour 22 minutes before

Special Weather Statement
National Weather Service New York NY
555 PM EDT Thu Jul 27 2023

CTZ007-008-272245-
Northern New London CT-Northern Middlesex CT-
555 PM EDT Thu Jul 27 2023

...THUNDERSTORMS WILL IMPACT NORTHERN NEW LONDON AND NORTH CENTRAL
MIDDLESEX COUNTIES THROUGH 645 PM EDT...

At 554 PM EDT, Doppler radar was tracking thunderstorms along a line
extending from near Canterbury to New Britain. Movement was east at
35 mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to outdoor objects is
         possible.

Strong thunderstorms will be near...
  East Hampton and Cromwell around 600 PM EDT.
  Colchester and Lisbon around 605 PM EDT.
  Griswold and Voluntown around 610 PM EDT.
  Norwich around 615 PM EDT.
  Jewett City and Bozrah around 620 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern Connecticut.

&&

LAT...LON 4155 7247 4163 7272 4165 7250 4158 7247
      4160 7241 4159 7239 4161 7233 4164 7233
      4167 7227 4169 7227 4171 7224 4166 7216
      4163 7196 4164 7179 4160 7179
TIME...MOT...LOC 2154Z 283DEG 31KT 4173 7200 4168 7276

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

NV

Special weather statement, Jul 27, 6:09 PM EDT, 1 hour 8 minutes before

Special Weather Statement
National Weather Service New York NY
609 PM EDT Thu Jul 27 2023

CTZ005-009-010-NYZ070-272300-
Northern Fairfield CT-Southern Fairfield CT-Southern New Haven CT-
Northern Westchester NY-
609 PM EDT Thu Jul 27 2023

...STRONG THUNDERSTORMS WILL IMPACT SOUTHERN FAIRFIELD...SOUTH
CENTRAL NEW HAVEN AND NORTHERN WESTCHESTER COUNTIES THROUGH 700 PM
EDT...

At 609 PM EDT, Doppler radar was tracking a cluster of strong
thunderstorms over Georgetown, or 7 miles north of New Canaan, moving
east at 65 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Bridgeport, Stamford, Norwalk, Danbury, Milford, Shelton, New Canaan,
Mount Kisco, Newtown, Fairfield, Stratford, Trumbull, Westport,
Ridgefield, and Darien.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern Connecticut...and southeastern New York.

&&

LAT...LON 4124 7293 4119 7301 4120 7305 4117 7310
      4115 7309 4114 7311 4116 7317 4111 7326
      4112 7330 4109 7334 4107 7336 4105 7341
      4121 7376 4138 7347
TIME...MOT...LOC 2209Z 281DEG 54KT 4124 7346

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

BR

Special weather statement, Jul 27, 6:10 PM EDT, 1 hour 7 minutes before

Special Weather Statement
National Weather Service New York NY
610 PM EDT Thu Jul 27 2023

CTZ005>007-010-272300-
Northern Fairfield CT-Northern New Haven CT-Northern Middlesex CT-
Southern New Haven CT-
610 PM EDT Thu Jul 27 2023

...STRONG THUNDERSTORMS WILL IMPACT CENTRAL FAIRFIELD...NORTHERN
MIDDLESEX AND NEW HAVEN COUNTIES THROUGH 700 PM EDT...

At 610 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Thomaston to Woodbury Center to near Bethel.
Movement was east at 35 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to outdoor objects is
         possible.

Strong thunderstorms will be near...
  Waterbury and Naugatuck around 615 PM EDT.
  Monroe and Prospect around 620 PM EDT.
  Shelton and Cheshire around 625 PM EDT.
  Meriden and Hamden around 630 PM EDT.
  Middletown and Wallingford around 635 PM EDT.
  New Haven and North Haven around 640 PM EDT.
  Durham and North Branford around 645 PM EDT.
  Lake Pocotopaug--East Hampton around 650 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern Connecticut.

&&

LAT...LON 4155 7245 4124 7278 4123 7289 4125 7292
      4120 7299 4148 7345 4151 7339 4147 7331
      4149 7333 4151 7332 4151 7316 4156 7316
      4164 7295 4156 7295 4154 7285 4157 7284
      4155 7282 4158 7275 4163 7271 4165 7250
TIME...MOT...LOC 2210Z 283DEG 31KT 4168 7311 4156 7323 4141 7342

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

NV

Special weather statement, Jul 27, 6:37 PM EDT, 40 minutes before

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Local storm report, Jul 27, 6:53 PM EDT, 24 minutes before

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Special weather statement, Jul 27, 7:03 PM EDT, 14 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 4:26 PM EDT	Special Weather Statement	OKX	Orange	49 min
Jul 27, 4:46 PM EDT	Severe Thunderstorm Warning	OKX	Orange	44 min
Jul 27, 5:14 PM EDT	Severe Thunderstorm Warning Considerable damage threat	OKX	Orange, Putnam, Rockland, Westchester	46 min
Jul 27, 5:34 PM EDT	Severe Thunderstorm Warning	OKX	Putnam	41 min
Jul 27, 5:40 PM EDT	Severe Thunderstorm Warning Considerable damage threat	OKX	Putnam, Rockland, Westchester	31 min
Jul 27, 6:24 PM EDT	Special Marine Warning	OKX		66 min
Jul 27, 7:20 PM EDT	Special Marine Warning	OKX		55 min
Jul 27, 7:32 PM EDT	Special Weather Statement	OKX	Bronx	43 min
Jul 27, 5:55 PM EDT	Special Weather Statement	OKX		50 min
Jul 27, 6:09 PM EDT	Special Weather Statement	OKX		51 min
Jul 27, 6:10 PM EDT	Special Weather Statement	OKX		50 min
Jul 27, 6:37 PM EDT	Special Weather Statement	OKX		53 min
Jul 27, 7:03 PM EDT	Special Weather Statement	OKX		57 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2023 Every severe thunderstorm warning in 2023

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.