Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 30, NWS New York, NY

June 30, 2021Suffolk County, New York

NWS New York, NY issued this severe thunderstorm warning at Jun 30, 2021, 8:37 PM EDT for Suffolk County, New York. It was in force for 38 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: Jun 30, 2021, 8:37 PM EDT (00:37 UTC)
Expired: Jun 30, 2021, 9:15 PM EDT
In force: 38 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 40 km from the middle of the area, began a volume at 00:41 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 nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.6 hours before the alert went out and 40 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: 1308 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

349 
WUUS51 KOKX 010037
SVROKX
NYC103-010115-
/O.NEW.KOKX.SV.W.0030.210701T0037Z-210701T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
837 PM EDT Wed Jun 30 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  West central Suffolk County in southeastern New York...

* Until 915 PM EDT.

* At 837 PM EDT, a severe thunderstorm was located near Bayville, or
  near Oyster Bay, moving east at 25 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Huntington around 850 PM EDT.
  Northport and Centerport around 855 PM EDT.
  Stony Brook around 915 PM EDT.

This includes the following New York State COVID tent site 
SUNY Stony Brook.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4087 7347 4088 7349 4089 7349 4092 7351
      4093 7351 4096 7349 4094 7342 4097 7339
      4094 7334 4095 7329 4092 7322 4093 7317
      4097 7317 4099 7312 4098 7309 4086 7309
TIME...MOT...LOC 0037Z 271DEG 20KT 4094 7349 

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

MW

1 follow-up statement

898 
WWUS51 KOKX 010107
SVSOKX

Severe Weather Statement
National Weather Service New York NY
907 PM EDT Wed Jun 30 2021

NYC103-010117-
/O.EXP.KOKX.SV.W.0030.000000T0000Z-210701T0115Z/
Suffolk NY-
907 PM EDT Wed Jun 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SUFFOLK COUNTY
WILL EXPIRE AT 915 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 4087 7347 4088 7349 4089 7349 4092 7351
      4093 7351 4096 7349 4094 7342 4097 7339
      4094 7334 4095 7329 4092 7322 4093 7317
      4097 7317 4099 7312 4098 7309 4086 7309
TIME...MOT...LOC 0107Z 271DEG 20KT 4094 7328 

$$

MW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:29 PM EDT	Special Marine Warning	OKX		61 min
Jun 30, 8:31 PM EDT	Special Weather Statement	OKX	Nassau	44 min
Jun 30, 8:41 PM EDT	Special Weather Statement	OKX	Bronx, New York	49 min
Jun 30, 8:55 PM EDT	Special Marine Warning	OKX		35 min
Jun 30, 9:06 PM EDT	Special Weather Statement	OKX	Nassau	39 min
Jun 30, 9:07 PM EDT	Special Weather Statement	OKX	Richmond	38 min
Jun 30, 9:24 PM EDT	Severe Thunderstorm Warning	OKX	Nassau, Suffolk	29 min
Jun 30, 9:30 PM EDT	Special Marine Warning	OKX		60 min
Jun 30, 9:38 PM EDT	Special Marine Warning	OKX		67 min
Jun 30, 9:39 PM EDT	Severe Thunderstorm Warning	OKX	Kings, Nassau, New York, Queens, Richmond	51 min
Jun 30, 9:57 PM EDT	Special Weather Statement	OKX	Bronx, New York	33 min
Jun 30, 10:00 PM EDT	Special Marine Warning	OKX		45 min
Jun 30, 10:22 PM EDT	Special Weather Statement	OKX	Nassau	23 min
Jun 30, 10:45 PM EDT	Special Weather Statement	OKX	Nassau	45 min
Jun 30, 11:27 PM EDT	Special Weather Statement	OKX	Suffolk	93 min
Jul 1, 10:47 AM EDT	Flash Flood Watch	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more	10 hr
Jul 1, 7:42 PM EDT	Special Marine Warning	OKX		50 min

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