Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS New York, NY

June 4, 20216 counties in New York

NWS New York, NY issued this severe thunderstorm warning at Jun 4, 2021, 4:19 PM EDT for 6 counties in New York. It was in force for 41 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: Jun 4, 2021, 4:19 PM EDT (20:19 UTC)
Expired: Jun 4, 2021, 5:00 PM EDT
In force: 41 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Bronx County, NY, Kings County, NY, Nassau County, NY, Queens County, NY, Suffolk County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 62 km from the middle of the area, began a volume at 20:18 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.

What was reported inside it

Time	Report	Where	Remark
Jun 4, 4:51 PM EDT	MARINE TSTM WIND 45	Nyc/La Guardia, NY	39 KT WIND GUST REPORTED.

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.

Issued	Product	Office	Lasted
Jun 4, 3:09 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.3 hours before the alert went out and 62 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: 233 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

789 
WUUS51 KOKX 042019
SVROKX
NYC005-047-059-081-103-119-042100-
/O.NEW.KOKX.SV.W.0015.210604T2019Z-210604T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
419 PM EDT Fri Jun 4 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  South central Westchester County in southeastern New York...
  Queens County in southeastern New York...
  Bronx County in southeastern New York...
  Western Suffolk County in southeastern New York...
  Kings County in southeastern New York...
  Nassau County in southeastern New York...

* Until 500 PM EDT.

* At 418 PM EDT, severe thunderstorms were located along a line
  extending from near Riverdale to Flushing to Coney Island, moving
  east at 35 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...
  Jamaica and New Rochelle around 425 PM EDT.
  Valley Stream and Elmont around 430 PM EDT.
  Garden City and Mineola around 435 PM EDT.
  Glen Cove and Woodmere around 440 PM EDT.
  Long Beach and Lynbrook around 445 PM EDT.
  Levittown and Plainview around 450 PM EDT.
  Freeport and Massapequa around 455 PM EDT.
  Huntington Station and Deer Park around 500 PM EDT.

This includes the following New York State COVID tent sites 
Lehman College...
Bay Plaza...
New Rochelle...
Aqueduct Racetrack...
Jones Beach...
and Beverly Road in Brooklyn.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4056 7400 4077 7390 4094 7391 4096 7367
      4087 7374 4088 7371 4086 7366 4091 7364
      4093 7352 4096 7349 4094 7342 4097 7339
      4095 7330 4068 7324 4067 7326 4067 7324
      4062 7323 4057 7356 4057 7376 4054 7391
TIME...MOT...LOC 2018Z 275DEG 28KT 4089 7387 4077 7383 4058 7396 

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

MW

1 follow-up statement

997 
WWUS51 KOKX 042054
SVSOKX

Severe Weather Statement
National Weather Service New York NY
454 PM EDT Fri Jun 4 2021

NYC005-047-081-119-042103-
/O.CAN.KOKX.SV.W.0015.000000T0000Z-210604T2100Z/
Westchester NY-Queens NY-Bronx NY-Kings NY-
454 PM EDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WESTCHESTER...
QUEENS...BRONX AND KINGS COUNTIES 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 800 PM EDT for
southeastern New York.

LAT...LON 4066 7360 4076 7362 4086 7366 4091 7364
      4093 7352 4096 7349 4094 7342 4097 7339
      4094 7334 4095 7330 4068 7324 4067 7326
      4067 7324 4062 7323 4057 7357 4057 7365
TIME...MOT...LOC 2053Z 275DEG 28KT 4087 7357 4075 7353 4056 7366 

$$

NYC059-103-042100-
/O.CON.KOKX.SV.W.0015.000000T0000Z-210604T2100Z/
Suffolk NY-Nassau NY-
454 PM EDT Fri Jun 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR WESTERN SUFFOLK AND NASSAU COUNTIES...

At 453 PM EDT, severe thunderstorms were located along a line
extending from near Oyster Bay to Hicksville to near Long Beach,
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...
  Levittown and Plainview around 500 PM EDT.
  Melville and Amityville around 505 PM EDT.
  Huntington Station and Lindenhurst around 510 PM EDT.
  Deer Park and Babylon around 515 PM EDT.
  Commack and Bay Shore around 520 PM EDT.
  Robert Moses State Park around 530 PM EDT.

This includes the following New York State COVID tent site 
Jones Beach.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4066 7360 4076 7362 4086 7366 4091 7364
      4093 7352 4096 7349 4094 7342 4097 7339
      4094 7334 4095 7330 4068 7324 4067 7326
      4067 7324 4062 7323 4057 7357 4057 7365
TIME...MOT...LOC 2053Z 275DEG 28KT 4087 7357 4075 7353 4056 7366 

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

MW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 4, 2:48 PM EDT	Special Weather Statement	OKX	Rockland	42 min
Jun 4, 3:24 PM EDT	Special Marine Warning	OKX		96 min
Jun 4, 3:28 PM EDT	Special Weather Statement	OKX	Rockland, Westchester	47 min
Jun 4, 3:32 PM EDT	Areal Flood Advisory	OKX	Orange, Rockland, Westchester	97 min
Jun 4, 3:43 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more	47 min
Jun 4, 3:52 PM EDT	Special Marine Warning	OKX		85 min
Jun 4, 3:55 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more	95 min
Jun 4, 4:29 PM EDT	Special Marine Warning	OKX		61 min
Jun 4, 4:30 PM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	90 min
Jun 4, 5:03 PM EDT	Special Weather Statement	OKX	Nassau	42 min
Jun 4, 7:51 PM EDT	Small Craft Advisory	OKX		2 hr

Nearby

Severe Thunderstorm Warnings in New York, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.