Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 74, NWS New York, NY

September 1, 2021Greater Bridgeport Planning Region, Naugatuck Valley Planning Region, Connecticut; Westchester County, New York

NWS New York, NY issued this severe thunderstorm warning at Sep 1, 2021, 10:20 PM EDT for Greater Bridgeport Planning Region, Naugatuck Valley Planning Region, Connecticut; Westchester County, New York. It was in force for 55 min. 1 report 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
Sep 1, 2021, 10:20 PM EDT (02:20 UTC)
Expired
Sep 1, 2021, 11:15 PM EDT
In force
55 min
Issued by
NWS New York, NY
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Greater Bridgeport Planning Region, CT, Naugatuck Valley Planning Region, CT, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 48 km from the middle of the area, began a volume at 02:22 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

TimeReportWhereRemark
Sep 1, 11:00 PM EDTTSTM WND DMG3 Ssw Monroe, CTLARGE TREE SNAPPED IN HALF ON COUNTRYSIDE DRIVE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

IssuedProductOfficeLasted
Sep 1, 6:22 PM EDTTornado WatchSPC7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 2.3 hours before the alert went out and 48 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2021-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 123 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 279 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
123 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
512 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
279 m²/s²
0-3 km storm-relative helicity
456 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted.

519 
WUUS51 KOKX 020220
SVROKX
CTC001-009-NYC119-020315-
/O.NEW.KOKX.SV.W.0074.210902T0220Z-210902T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
1020 PM EDT Wed Sep 1 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Southern Fairfield County in southern Connecticut...
  South central New Haven County in southern Connecticut...
  Southern Westchester County in southeastern New York...

* Until 1115 PM EDT.

* At 1019 PM EDT, severe thunderstorms were located along a line
  extending from Bedford to near Bayville, moving northeast at 20
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  New Canaan around 1045 PM EDT.
  Ridgefield and Wilton around 1055 PM EDT.
  Weston around 1105 PM EDT.
  Trumbull and Redding around 1115 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 AM EDT for southern
Connecticut...and southeastern New York.

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

A Tornado Watch remains in effect until 100 AM EDT for southern
Connecticut...and southeastern New York.

&&

LAT...LON 4138 7303 4121 7298 4119 7300 4120 7305
      4117 7309 4114 7309 4116 7317 4110 7325
      4112 7330 4109 7334 4105 7338 4099 7356
      4100 7359 4097 7362 4097 7365 4093 7369
      4093 7371 4120 7376
TIME...MOT...LOC 0219Z 243DEG 17KT 4121 7365 4094 7358 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

NV
1 follow-up statement
713 
WWUS51 KOKX 020315
SVSOKX

Severe Weather Statement
National Weather Service New York NY
1115 PM EDT Wed Sep 1 2021

CTC001-009-NYC119-020323-
/O.EXP.KOKX.SV.W.0074.000000T0000Z-210902T0315Z/
Fairfield CT-New Haven CT-Westchester NY-
1115 PM EDT Wed Sep 1 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN FAIRFIELD...SOUTH
CENTRAL NEW HAVEN AND SOUTHERN WESTCHESTER COUNTIES WILL EXPIRE AT
1115 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

A Tornado Watch remains in effect until 100 AM EDT for southern
Connecticut...and southeastern New York.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Upton NY.

Remember, a Severe Thunderstorm Warning still remains in effect for
Eastern Suffolk, Southeastern Fairfield, and Southern New Haven.

LAT...LON 4138 7303 4121 7298 4119 7300 4120 7305
      4117 7309 4114 7309 4116 7317 4110 7325
      4112 7330 4109 7334 4105 7338 4099 7356
      4100 7359 4097 7362 4097 7365 4093 7369
      4093 7371 4120 7376
TIME...MOT...LOC 0313Z 243DEG 17KT 4132 7335 4105 7329 

$$

NV

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 9:25 PM EDTSevere Thunderstorm WarningOKXGreater Bridgeport Planning Region65 min
Sep 1, 10:08 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatOKXGreater Bridgeport Planning Region, Naugatuck Valley Planning Region4 hr
Sep 1, 11:11 PM EDTSevere Thunderstorm WarningOKXGreater Bridgeport Planning Region, Naugatuck Valley Planning Region64 min
Sep 2, 12:06 AM EDTFlash Flood Warning Considerable damage threatOKXLower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region5 hr
Sep 2, 12:13 AM EDTSevere Thunderstorm Warning Considerable damage threatOKXLower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region92 min
Sep 2, 12:53 AM EDTRiver Flood WarningOKXNaugatuck Valley Planning Region5 hr
Sep 2, 1:06 AM EDTAreal Flood WarningOKXGreater Bridgeport Planning Region4 hr
Sep 2, 1:15 AM EDTRiver Flood WarningOKXSoutheastern Connecticut Planning Region21 hr
Sep 2, 1:19 AM EDTRiver Flood WarningOKXSoutheastern Connecticut Planning Region8 hr
Sep 2, 2:30 AM EDTAreal Flood WarningOKXGreater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region8 hr
Sep 2, 5:01 AM EDTAreal Flood WarningOKXGreater Bridgeport Planning Region3 hr
Sep 2, 5:23 AM EDTAreal Flood WarningOKXLower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region19 hr
Sep 2, 10:07 AM EDTAreal Flood WarningOKXGreater Bridgeport Planning Region, Naugatuck Valley Planning Region15 hr
Sep 1, 8:32 PM EDTSevere Thunderstorm WarningOKXNew York, Richmond43 min
Sep 1, 9:03 PM EDTSevere Thunderstorm WarningOKXBronx, Kings, Nassau, New York, Queens, Westchester42 min
Sep 1, 9:06 PM EDTTornado WarningOKXBronx, New York, Westchester24 min
Sep 1, 9:15 PM EDTSpecial Marine WarningOKX60 min
Sep 1, 9:25 PM EDTSpecial Marine WarningOKX65 min
Sep 1, 9:28 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatOKXBronx, Kings, New York, Queens, Westchester2 hr
Sep 1, 9:34 PM EDTSpecial Marine WarningOKX12 min
Sep 1, 9:56 PM EDTSpecial Marine WarningOKX34 min
Sep 1, 9:57 PM EDTSevere Thunderstorm WarningOKXKings, Nassau, Queens48 min
Sep 1, 10:09 PM EDTSpecial Marine WarningOKX96 min
Sep 1, 10:12 PM EDTSpecial Marine WarningOKX20 min
Sep 1, 10:26 PM EDTSpecial Marine WarningOKX64 min
Sep 1, 10:30 PM EDTSevere Thunderstorm WarningOKXNassau, Suffolk45 min
Sep 1, 10:39 PM EDTTornado WarningOKXSuffolk36 min
Sep 1, 10:44 PM EDTSevere Thunderstorm WarningOKXNassau46 min
Sep 1, 10:47 PM EDTSpecial Marine WarningOKX118 min
Sep 1, 10:55 PM EDTSpecial Marine WarningOKX45 min
Sep 1, 11:13 PM EDTFlash Flood WarningOKXSuffolk6 hr
Sep 1, 11:19 PM EDTSpecial Marine WarningOKX86 min
Sep 1, 11:54 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatOKXBronx, Kings, New York, Queens, Richmond, Westchester3 hr
Sep 2, 12:25 AM EDTFlash Flood WarningOKXNassau, Queens, Suffolk4 hr
Sep 2, 12:28 AM EDTSpecial Marine WarningOKX92 min
Sep 2, 12:48 AM EDTRiver Flood WarningOKXOrange, Ulster12 hr
Sep 2, 1:50 AM EDTSpecial Weather StatementOKXSuffolk40 min
Sep 2, 1:57 AM EDTSpecial Marine WarningOKX80 min
Sep 2, 2:53 AM EDTAreal Flood WarningOKXBronx, Kings, Nassau, New York, Queens, Richmond and 1 more7 hr
Sep 2, 3:50 AM EDTRip Current StatementOKXKings, Nassau, Queens, Suffolk16 hr
Sep 2, 4:38 AM EDTAreal Flood AdvisoryOKXNassau, Queens, Suffolk3 hr
Sep 2, 4:55 AM EDTAreal Flood AdvisoryOKXSuffolk3 hr
Sep 2, 7:49 AM EDTAreal Flood AdvisoryOKXOrange, Putnam, Rockland, Westchester10 hr
Sep 2, 10:16 AM EDTAreal Flood WarningOKXBronx, Nassau, Rockland, Westchester25 hr
Sep 2, 10:59 AM EDTSmall Craft AdvisoryOKX19 hr

Nearby

Severe Thunderstorm Warnings in Connecticut, 2021Severe Thunderstorm Warnings in New York, 2021Every 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.