Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 49, NWS New York, NY

July 8, 2021Nassau County, Suffolk County, New York

NWS New York, NY issued this severe thunderstorm warning at Jul 8, 2021, 5:16 PM EDT for Nassau County, Suffolk County, New York. It was in force for 44 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 8, 2021, 5:16 PM EDT (21:16 UTC)
Expired
Jul 8, 2021, 6:00 PM EDT
In force
44 min
Issued by
NWS New York, NY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Nassau County, NY, Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 45 km from the middle of the area, began a volume at 21:20 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
Jul 8, 2:09 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.3 hours before the alert went out and 44 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 2021-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 973 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2021-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.193958Sfc1 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
973 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
751 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

068 
WUUS51 KOKX 082116
SVROKX
NYC059-103-082200-
/O.NEW.KOKX.SV.W.0049.210708T2116Z-210708T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
516 PM EDT Thu Jul 8 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Western Suffolk County in southeastern New York...
  Southeastern Nassau County in southeastern New York...

* Until 600 PM EDT.

* At 516 PM EDT, a severe thunderstorm was located over Wantagh, or
  over Freeport, moving northeast at 35 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.

* This severe thunderstorm will be near...
  Massapequa around 520 PM EDT.
  Levittown, Hicksville and Amityville around 525 PM EDT.
  Lindenhurst, Plainview and Farmingdale around 530 PM EDT.
  Babylon, Melville and Woodbury around 535 PM EDT.
  Huntington Station, Deer Park and Dix Hills around 540 PM EDT.
  Islip, Brentwood and Bay Shore around 545 PM EDT.
  Commack, Hauppauge and Northport around 550 PM EDT.
  Smithtown around 555 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4068 7367 4095 7329 4092 7322 4093 7317
      4096 7317 4080 7303 4057 7358 4057 7364
TIME...MOT...LOC 2116Z 232DEG 29KT 4066 7354 

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

Goodman
3 follow-up statements
524 
WWUS51 KOKX 082134
SVSOKX

Severe Weather Statement
National Weather Service New York NY
534 PM EDT Thu Jul 8 2021

NYC059-103-082200-
/O.CON.KOKX.SV.W.0049.000000T0000Z-210708T2200Z/
Suffolk NY-Nassau NY-
534 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR WESTERN SUFFOLK AND SOUTHEASTERN NASSAU COUNTIES...

At 533 PM EDT, the leading edge of a severe thunderstorm was located 
along a line extending from Plainview to near Farmingdale to 
Amityville. The storm was moving northeast at 25 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.

These severe storms will be near...
  Huntington Station around 540 PM EDT.
  Deer Park, Babylon and Dix Hills around 545 PM EDT.
  Northport around 550 PM EDT.
  Brentwood, Commack and Bay Shore around 555 PM EDT.
  Islip and Hauppauge around 600 PM EDT.
  Smithtown around 605 PM EDT.
  Ronkonkoma around 610 PM EDT.
  Stony Brook and Holbrook around 615 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 4069 7356 4077 7354 4095 7328 4092 7322
      4093 7317 4096 7317 4081 7304 4079 7306
      4065 7339 4063 7351
TIME...MOT...LOC 2133Z 246DEG 23KT 4079 7345 4072 7340 4069 7343 

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

Goodman
107 
WWUS51 KOKX 082148
SVSOKX

Severe Weather Statement
National Weather Service New York NY
548 PM EDT Thu Jul 8 2021

NYC059-082157-
/O.CAN.KOKX.SV.W.0049.000000T0000Z-210708T2200Z/
Nassau NY-
548 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN NASSAU COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 9 PM. 

LAT...LON 4069 7334 4085 7340 4094 7315 4081 7304
      4079 7306 4075 7315
TIME...MOT...LOC 2147Z 248DEG 26KT 4084 7333 4076 7328 4072 7331 

$$

NYC103-082200-
/O.CON.KOKX.SV.W.0049.000000T0000Z-210708T2200Z/
Suffolk NY-
548 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR WESTERN SUFFOLK COUNTY...

At 547 PM EDT, severe thunderstorms were located along a line
extending from near Commack to Brentwood to Babylon, 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.

These severe storms will be near...
  Brentwood and Commack around 550 PM EDT.
  Islip, Hauppauge and Bay Shore around 555 PM EDT.
  Smithtown around 600 PM EDT.
  Ronkonkoma around 605 PM EDT.
  Stony Brook around 610 PM EDT.
  Holbrook around 615 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 4069 7334 4085 7340 4094 7315 4081 7304
      4079 7306 4075 7315
TIME...MOT...LOC 2147Z 248DEG 26KT 4084 7333 4076 7328 4072 7331 

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

Goodman
880 
WWUS51 KOKX 082156
SVSOKX

Severe Weather Statement
National Weather Service New York NY
556 PM EDT Thu Jul 8 2021

NYC103-082205-
/O.EXP.KOKX.SV.W.0049.000000T0000Z-210708T2200Z/
Suffolk NY-
556 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SUFFOLK COUNTY WILL
EXPIRE AT 600 PM EDT...
            
The storm which prompted the warning has weakened and no longer 
poses an immediate threat to life or property. Gusty winds and heavy 
rain are still possible with this storm as it moves farther east 
into Suffolk County.

A Severe Thunderstorm Watch remains in effect until 9 PM. 

LAT...LON 4069 7334 4085 7340 4094 7315 4081 7304
      4079 7306 4075 7315
TIME...MOT...LOC 2155Z 232DEG 29KT 4086 7330 4078 7325 4074 7328 

$$

Goodman

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 8:02 PM EDTSpecial Weather StatementOKXPutnam43 min
Jul 7, 10:43 PM EDTSpecial Weather StatementOKXDutchess47 min
Jul 7, 11:19 PM EDTSpecial Weather StatementOKXOrange56 min
Jul 7, 11:34 PM EDTSpecial Weather StatementOKXOrange, Putnam56 min
Jul 7, 11:46 PM EDTSpecial Weather StatementOKXOrange, Putnam, Rockland, Westchester44 min
Jul 8, 12:18 AM EDTAreal Flood AdvisoryOKXOrange66 min
Jul 8, 12:29 AM EDTSpecial Weather StatementOKXPutnam, Westchester46 min
Jul 8, 12:44 AM EDTAreal Flood AdvisoryOKXOrange, Putnam62 min
Jul 8, 5:08 AM EDTTropical Storm WarningOKXNassau, Suffolk33 hr
Jul 8, 9:23 AM EDTAreal Flood AdvisoryOKXOrange112 min
Jul 8, 11:54 AM EDTSpecial Weather StatementOKXOrange66 min
Jul 8, 12:59 PM EDTSpecial Weather StatementOKXPutnam46 min
Jul 8, 12:59 PM EDTSpecial Weather StatementOKXRockland46 min
Jul 8, 1:24 PM EDTSevere Thunderstorm WarningOKXRockland51 min
Jul 8, 2:11 PM EDTSevere Thunderstorm WarningOKXBronx, Rockland, Westchester49 min
Jul 8, 2:29 PM EDTAreal Flood AdvisoryOKXRockland, Westchester2 hr
Jul 8, 2:53 PM EDTSpecial Marine WarningOKX52 min
Jul 8, 2:58 PM EDTSpecial Weather StatementOKXNassau, Queens47 min
Jul 8, 3:10 PM EDTSmall Craft AdvisoryOKX23 hr
Jul 8, 3:15 PM EDTFlash Flood WarningOKXRockland, Westchester3 hr
Jul 8, 3:19 PM EDTSpecial Weather StatementOKXNew York41 min
Jul 8, 3:49 PM EDTSpecial Marine WarningOKX56 min
Jul 8, 3:53 PM EDTFlash Flood WarningOKXBronx, Kings, Nassau, New York, Queens, Westchester3 hr
Jul 8, 4:00 PM EDTSpecial Weather StatementOKXNassau45 min
Jul 8, 4:37 PM EDTSpecial Weather StatementOKXBronx, New York38 min
Jul 8, 4:51 PM EDTSpecial Marine WarningOKX24 min
Jul 8, 5:03 PM EDTSpecial Weather StatementOKXNassau42 min
Jul 8, 5:06 PM EDTFlash Flood Warning Considerable damage threatOKXBronx, New York, Westchester3 hr
Jul 8, 5:38 PM EDTAreal Flood AdvisoryOKXNassau, Suffolk3 hr
Jul 8, 5:59 PM EDTSpecial Weather StatementOKXSuffolk46 min
Jul 8, 6:15 PM EDTAreal Flood AdvisoryOKXRockland, Westchester3 hr
Jul 8, 6:40 PM EDTSpecial Weather StatementOKXSuffolk50 min
Jul 8, 6:59 PM EDTAreal Flood AdvisoryOKXKings, Nassau, New York, Queens90 min
Jul 8, 7:17 PM EDTSpecial Weather StatementOKXNassau43 min

Nearby

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