Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 57, NWS New York, NY

July 17, 2021Richmond County, New York

NWS New York, NY issued this severe thunderstorm warning at Jul 17, 2021, 3:54 PM EDT for Richmond County, New York. It was in force for 16 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 17, 2021, 3:54 PM EDT (19:54 UTC)
Expired: Jul 17, 2021, 4:10 PM EDT
In force: 16 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Richmond County, NY

The radar

The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 19:55 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.

Issued	Product	Office	Lasted
Jul 17, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.9 hours before the alert went out and 116 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: 1203 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

184 
WUUS51 KOKX 171954
SVROKX
NYC085-172045-
/O.NEW.KOKX.SV.W.0057.210717T1954Z-210717T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
354 PM EDT Sat Jul 17 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Richmond County in southeastern New York...

* Until 445 PM EDT.

* At 354 PM EDT, a severe thunderstorm was located over Tottenville,
  or over Perth Amboy, moving east at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Huguenot around 405 PM EDT.
  Oakwood around 410 PM EDT.
  Todt Hill and Port Richmond around 415 PM EDT.
  The Verrazano Narrows Bridge and Tompkinsville around 425 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4050 7426 4051 7426 4052 7425 4055 7425
      4056 7421 4060 7420 4063 7420 4065 7417
      4064 7412 4065 7408 4060 7403 4054 7409
      4050 7424
TIME...MOT...LOC 1954Z 247DEG 17KT 4053 7422 

HAIL...<.75IN
WIND...60MPH
 
$$

Goodman

1 follow-up statement

210 
WWUS51 KOKX 172010
SVSOKX

Severe Weather Statement
National Weather Service New York NY
410 PM EDT Sat Jul 17 2021

NYC085-172019-
/O.CAN.KOKX.SV.W.0057.000000T0000Z-210717T2045Z/
Richmond NY-
410 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR RICHMOND COUNTY 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.

A severe thunderstorm watch remains in effect until 11 PM. 

LAT...LON 4050 7426 4051 7426 4052 7425 4055 7425
      4056 7421 4060 7420 4063 7420 4065 7417
      4064 7412 4065 7408 4060 7403 4054 7409
      4050 7424
TIME...MOT...LOC 2008Z 247DEG 17KT 4056 7413 

$$

Goodman

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 1:13 PM EDT	Special Weather Statement	OKX	New York	32 min
Jul 17, 1:48 PM EDT	Special Marine Warning	OKX		22 min
Jul 17, 1:51 PM EDT	Severe Thunderstorm Warning	OKX	Kings, Queens	24 min
Jul 17, 2:01 PM EDT	Severe Thunderstorm Warning	OKX	New York	44 min
Jul 17, 2:42 PM EDT	Severe Thunderstorm Warning	OKX	New York	33 min
Jul 17, 2:49 PM EDT	Special Weather Statement	OKX	Richmond	41 min
Jul 17, 3:10 PM EDT	Tornado Warning	OKX	Richmond	19 min
Jul 17, 3:18 PM EDT	Severe Thunderstorm Warning	OKX	Kings, New York, Richmond	42 min
Jul 17, 3:20 PM EDT	Special Marine Warning	OKX		55 min
Jul 17, 3:25 PM EDT	Special Weather Statement	OKX	Putnam	50 min
Jul 17, 3:59 PM EDT	Special Weather Statement	OKX	Rockland	46 min
Jul 17, 4:49 PM EDT	Special Weather Statement	OKX	Orange	26 min
Jul 17, 5:02 PM EDT	Areal Flood Advisory	OKX	Orange	88 min
Jul 17, 6:54 PM EDT	Special Weather Statement	OKX	Orange	51 min
Jul 17, 7:05 PM EDT	Special Weather Statement	OKX	Putnam	40 min
Jul 17, 7:06 PM EDT	Areal Flood Advisory	OKX	Orange	84 min
Jul 17, 7:40 PM EDT	Special Weather Statement	OKX	Rockland	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.