Alert archive / New York / Tornado Warnings in 2020

Tornado Warning 3, NWS New York, NY

August 4, 2020Suffolk County, New York; Lower Connecticut River Valley Planning Region, Connecticut

NWS New York, NY issued this tornado warning at Aug 4, 2020, 2:05 PM EDT for Suffolk County, New York; Lower Connecticut River Valley Planning Region, Connecticut. It was in force for 25 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
Aug 4, 2020, 2:05 PM EDT (18:05 UTC)
Expired
Aug 4, 2020, 2:30 PM EDT
In force
25 min
Issued by
NWS New York, NY
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Lower Connecticut River Valley Planning Region, CT, Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 47 km from the middle of the area, began a volume at 18:05 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.

IssuedProductOfficeLasted
Aug 4, 7:23 AM EDTTornado WatchSPC9 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.1 hours before the alert went out and 47 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 12:00Z on 2020-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1593 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 12:00Z on 2020-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 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
1593 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
570 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
1.5
Supercell composite
7.4

Open this sounding in Storm Lab

The text

As transmitted.

191 
WFUS51 KOKX 041805
TOROKX
CTC007-NYC103-041830-
/O.NEW.KOKX.TO.W.0003.200804T1805Z-200804T1830Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New York NY
205 PM EDT Tue Aug 4 2020

The National Weather Service in Upton NY has issued a

* Tornado Warning for...
  Southern Middlesex County in southern Connecticut...
  Eastern Suffolk County in southeastern New York...

* Until 230 PM EDT.
    
* At 204 PM EDT, a severe thunderstorm capable of producing a tornado
  was located 10 miles south of Southhampton, moving north at 65 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Southold, Clinton, Old Saybrook, Southhampton, Sag Harbor,
  Bridgehampton, Westbrook, Shelter Island, Greenport, Shinnecock
  Hills, Peconic, Noyack, North Haven, Fenwick and Orient.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4115 7220 4110 7229 4105 7222 4090 7225
      4081 7253 4092 7253 4091 7250 4095 7247
      4097 7249 4097 7253 4106 7253 4115 7236
      4125 7236 4125 7252 4131 7252 4130 7234
      4126 7232 4117 7235 4120 7219
TIME...MOT...LOC 1804Z 184DEG 58KT 4073 7242 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

JP
1 follow-up statement
148 
WWUS51 KOKX 041825
SVSOKX

Severe Weather Statement
National Weather Service New York NY
225 PM EDT Tue Aug 4 2020

CTC007-NYC103-041835-
/O.EXP.KOKX.TO.W.0003.000000T0000Z-200804T1830Z/
Middlesex CT-Suffolk NY-
225 PM EDT Tue Aug 4 2020

...THE TORNADO WARNING FOR SOUTHERN MIDDLESEX AND EASTERN SUFFOLK
COUNTIES WILL EXPIRE AT 230 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 400 PM EDT for southern
Connecticut...and southeastern New York.

LAT...LON 4115 7220 4110 7229 4105 7222 4090 7225
      4081 7253 4092 7253 4091 7250 4095 7247
      4097 7249 4097 7253 4106 7253 4115 7236
      4125 7236 4125 7252 4131 7252 4130 7234
      4126 7232 4117 7235 4120 7219
TIME...MOT...LOC 1825Z 184DEG 58KT 4105 7239 

$$

JP

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 8:14 PM EDTSpecial Weather StatementOKXRichmond61 min
Aug 3, 8:35 PM EDTSpecial Marine WarningOKX40 min
Aug 3, 8:51 PM EDTSpecial Weather StatementOKXBronx, Kings, Nassau, New York, Queens39 min
Aug 3, 8:56 PM EDTSevere Thunderstorm WarningOKXKings, Nassau, Queens, Suffolk49 min
Aug 3, 9:05 PM EDTSpecial Marine WarningOKX25 min
Aug 3, 9:05 PM EDTSpecial Weather StatementOKXBronx, Kings, New York40 min
Aug 3, 9:06 PM EDTSpecial Weather StatementOKXNassau39 min
Aug 3, 9:08 PM EDTSpecial Marine WarningOKX15 min
Aug 3, 9:11 PM EDTSpecial Marine WarningOKX64 min
Aug 3, 9:17 PM EDTSpecial Weather StatementOKXSuffolk43 min
Aug 3, 9:29 PM EDTSpecial Marine WarningOKX91 min
Aug 3, 9:31 PM EDTSpecial Weather StatementOKXRockland, Westchester44 min
Aug 3, 9:33 PM EDTSpecial Weather StatementOKXPutnam, Rockland, Westchester57 min
Aug 3, 9:45 PM EDTSevere Thunderstorm WarningOKXPutnam, Westchester60 min
Aug 3, 10:05 PM EDTSpecial Marine WarningOKX65 min
Aug 3, 10:09 PM EDTSpecial Weather StatementOKXSuffolk51 min
Aug 3, 10:40 PM EDTSpecial Weather StatementOKXPutnam65 min
Aug 4, 3:22 AM EDTSpecial Weather StatementOKXRockland38 min
Aug 4, 11:16 AM EDTSpecial Marine WarningOKX59 min
Aug 4, 11:21 AM EDTSpecial Weather StatementOKXKings, New York, Queens39 min
Aug 4, 11:51 AM EDTAreal Flood AdvisoryOKXBronx, Kings, New York, Orange, Queens, Richmond and 1 more3 hr
Aug 4, 12:19 PM EDTSpecial Marine WarningOKX56 min
Aug 4, 12:38 PM EDTSpecial Marine WarningOKX67 min
Aug 4, 1:03 PM EDTSpecial Marine WarningOKX57 min
Aug 4, 1:04 PM EDTSpecial Marine WarningOKX56 min
Aug 4, 1:20 PM EDTSpecial Marine WarningOKX55 min
Aug 4, 1:35 PM EDTSpecial Marine WarningOKX55 min
Aug 4, 1:42 PM EDTSpecial Marine WarningOKX37 min
Aug 4, 1:57 PM EDTSpecial Marine WarningOKX63 min
Aug 4, 1:59 PM EDTSpecial Marine WarningOKX61 min
Aug 4, 2:15 PM EDTSpecial Marine WarningOKX45 min
Aug 4, 2:24 PM EDTSpecial Marine WarningOKX34 min
Aug 4, 3:01 PM EDTSpecial Marine WarningOKX28 min
Aug 4, 1:38 PM EDTTornado WarningOKXGreater Bridgeport Planning Region37 min
Aug 4, 2:49 PM EDTTornado WarningOKXLower Connecticut River Valley Planning Region15 min

Nearby

Tornado Warnings in New York, 2020Tornado Warnings in Connecticut, 2020Every tornado warning in 2020Tornadoes in 2020

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.