Alert archive / New York / Tornado Warnings in 2021

Tornado Warning 3, NWS New York, NY

July 17, 2021Richmond County, New York

NWS New York, NY issued this tornado warning at Jul 17, 2021, 3:10 PM EDT for Richmond County, New York. It was in force for 19 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, 3:10 PM EDT (19:10 UTC)
Expired: Jul 17, 2021, 3:29 PM EDT
In force: 19 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Richmond County, NY

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 19:14 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, 7.2 hours before the alert went out and 118 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.

432 
WFUS51 KOKX 171910
TOROKX
NYC085-171945-
/O.NEW.KOKX.TO.W.0003.210717T1910Z-210717T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New York NY
310 PM EDT Sat Jul 17 2021

The National Weather Service in Upton NY has issued a

* Tornado Warning for...
  Richmond County in southeastern New York...

* Until 345 PM EDT.
    
* At 310 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Carteret, or near Perth Amboy, moving east at 15
  mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Huguenot around 335 PM EDT.
  Todt Hill around 340 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4054 7425 4056 7424 4056 7422 4059 7421
      4060 7420 4061 7413 4054 7413
TIME...MOT...LOC 1910Z 269DEG 13KT 4057 7427 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Goodman

1 follow-up statement

268 
WWUS51 KOKX 171929
SVSOKX

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

NYC085-171938-
/O.CAN.KOKX.TO.W.0003.000000T0000Z-210717T1945Z/
Richmond NY-
329 PM EDT Sat Jul 17 2021

...THE TORNADO WARNING FOR RICHMOND COUNTY IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect. 

LAT...LON 4054 7425 4056 7424 4056 7422 4059 7421
      4060 7420 4061 7413 4054 7413
TIME...MOT...LOC 1927Z 269DEG 13KT 4057 7418 

$$

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, 3:18 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, 3:54 PM EDT	Severe Thunderstorm Warning	OKX	Richmond	16 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

Tornado Warnings in New York, 2021 Every tornado warning in 2021 Tornadoes 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.