Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 87, NWS New York, NY

November 13, 2021Suffolk County, New York

NWS New York, NY issued this severe thunderstorm warning at Nov 13, 2021, 4:30 PM EST for Suffolk County, New York. It was in force for 30 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: Nov 13, 2021, 4:30 PM EST (21:30 UTC)
Expired: Nov 13, 2021, 5:00 PM EST
In force: 30 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 72 km from the middle of the area, began a volume at 21:29 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
Nov 13, 4:36 PM EST	TSTM WND DMG	1 Ne East Hampton, NY	NUMEROUS TREES AND POWER LINES DOWN.

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
Nov 13, 12:27 PM EST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.5 hours before the alert went out and 72 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1435 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

899 
WUUS51 KOKX 132130
SVROKX
NYC103-132200-
/O.NEW.KOKX.SV.W.0087.211113T2130Z-211113T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
430 PM EST Sat Nov 13 2021

The National Weather Service in Upton NY has issued a

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

* Until 500 PM EST.

* At 430 PM EST, a severe thunderstorm was located near Gardiners
  Island, moving northeast at 65 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...
  Montauk Point around 445 PM EST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4103 7190 4090 7225 4100 7232 4106 7213
      4104 7212 4106 7212 4107 7209 4109 7206
      4101 7209 4105 7198 4109 7194 4108 7186
      4106 7185
TIME...MOT...LOC 2130Z 242DEG 57KT 4102 7212 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JC

1 follow-up statement

106 
WWUS51 KOKX 132155
SVSOKX

Severe Weather Statement
National Weather Service New York NY
455 PM EST Sat Nov 13 2021

NYC103-132205-
/O.EXP.KOKX.SV.W.0087.000000T0000Z-211113T2200Z/
Suffolk NY-
455 PM EST Sat Nov 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SUFFOLK COUNTY
WILL EXPIRE AT 500 PM EST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 700 PM EST for
southeastern New York.

LAT...LON 4103 7190 4090 7225 4100 7232 4106 7213
      4104 7212 4106 7212 4107 7209 4109 7206
      4101 7209 4105 7198 4109 7194 4108 7186
      4106 7185
TIME...MOT...LOC 2155Z 242DEG 57KT 4120 7166 

$$

JC

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 13, 12:47 PM EST	Special Weather Statement	OKX	Orange	88 min
Nov 13, 1:02 PM EST	Severe Thunderstorm Warning	OKX	Orange	47 min
Nov 13, 1:26 PM EST	Severe Thunderstorm Warning	OKX	Orange, Putnam, Rockland, Westchester	49 min
Nov 13, 1:48 PM EST	Severe Thunderstorm Warning	OKX	Bronx, Kings, New York, Queens, Richmond	42 min
Nov 13, 1:54 PM EST	Special Marine Warning	OKX		96 min
Nov 13, 2:11 PM EST	Special Weather Statement	OKX	Putnam	49 min
Nov 13, 2:22 PM EST	Severe Thunderstorm Warning	OKX	Kings, Nassau, Queens	38 min
Nov 13, 2:47 PM EST	Special Marine Warning	OKX		58 min
Nov 13, 2:53 PM EST	Tornado Warning	OKX	Nassau, Suffolk	37 min
Nov 13, 2:59 PM EST	Special Marine Warning	OKX		61 min
Nov 13, 3:18 PM EST	Special Weather Statement	OKX	Suffolk	57 min
Nov 13, 3:20 PM EST	Tornado Warning	OKX	Suffolk	25 min
Nov 13, 3:36 PM EST	Special Marine Warning	OKX		54 min
Nov 13, 3:40 PM EST	Tornado Warning	OKX	Suffolk	24 min
Nov 13, 3:54 PM EST	Special Marine Warning	OKX		66 min
Nov 13, 3:57 PM EST	Tornado Warning	OKX	Suffolk	18 min
Nov 13, 4:07 PM EST	Tornado Warning	OKX	Suffolk	23 min
Nov 13, 4:11 PM EST	Special Marine Warning	OKX		47 min
Nov 13, 4:18 PM EST	Severe Thunderstorm Warning	OKX	Suffolk	27 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.