Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS New York, NY

May 26, 2021Nassau County, Suffolk County, New York

NWS New York, NY issued this severe thunderstorm warning at May 26, 2021, 7:44 PM EDT for Nassau County, Suffolk County, New York. It was in force for 25 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: May 26, 2021, 7:44 PM EDT (23:44 UTC)
Expired: May 26, 2021, 8:09 PM EDT
In force: 25 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Nassau County, NY, Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 32 km from the middle of the area, began a volume at 23:43 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
May 26, 8:17 PM EDT	MARINE TSTM WIND 40	1 E Bellport, NY	WIND GUST.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.7 hours before the alert went out and 32 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: 5 J/kg
Mixed-layer CIN: -233 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

243 
WUUS51 KOKX 262344
SVROKX
NYC059-103-270030-
/O.NEW.KOKX.SV.W.0012.210526T2344Z-210527T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
744 PM EDT Wed May 26 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 830 PM EDT.

* At 744 PM EDT, a severe thunderstorm was located over Farmingdale,
  moving east at 45 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...
  Deer Park and Babylon around 750 PM EDT.
  Commack and Bay Shore around 755 PM EDT.
  Islip and Brentwood around 800 PM EDT.
  Ronkonkoma around 805 PM EDT.
  Centereach and Holbrook around 810 PM EDT.
  Medford and Patchogue around 815 PM EDT.
  Middle Island and Yaphank around 820 PM EDT.
  Shirley and Mastic around 825 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 4082 7357 4098 7288 4073 7278 4066 7303
      4060 7352
TIME...MOT...LOC 2344Z 261DEG 39KT 4073 7342 

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

1 follow-up statement

413 
WWUS51 KOKX 270009
SVSOKX

Severe Weather Statement
National Weather Service New York NY
809 PM EDT Wed May 26 2021

NYC059-103-270019-
/O.CAN.KOKX.SV.W.0012.000000T0000Z-210527T0030Z/
Suffolk NY-Nassau NY-
809 PM EDT Wed May 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SUFFOLK AND
SOUTHEASTERN NASSAU COUNTIES IS CANCELLED...
                
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 has been cancelled.  However gusty winds 
up to 40 mph are still possible with this thunderstorm.

LAT...LON 4082 7357 4098 7288 4073 7278 4066 7303
      4060 7352
TIME...MOT...LOC 0008Z 261DEG 39KT 4077 7307 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 4:44 PM EDT	Special Weather Statement	OKX	Orange	46 min
May 26, 6:12 PM EDT	Severe Thunderstorm Warning	OKX	Richmond	46 min
May 26, 6:15 PM EDT	Special Marine Warning	OKX		90 min
May 26, 6:45 PM EDT	Special Weather Statement	OKX	Bronx, Kings, Nassau, New York, Putnam, Queens and 2 more	60 min
May 26, 6:54 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Rockland, Westchester	24 min
May 26, 6:56 PM EDT	Special Marine Warning	OKX		94 min
May 26, 7:34 PM EDT	Special Weather Statement	OKX	Nassau	41 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.