Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 55, NWS New York, NY

July 17, 20214 counties in New Jersey; New York County, New York

NWS New York, NY issued this severe thunderstorm warning at Jul 17, 2021, 2:42 PM EDT for 4 counties in New Jersey; New York County, New York. It was in force for 33 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: Jul 17, 2021, 2:42 PM EDT (18:42 UTC)
Expired: Jul 17, 2021, 3:15 PM EDT
In force: 33 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Union County, NJ, New York County, NY

The radar

The Philadelphia radar (KDIX), 99 km from the middle of the area, began a volume at 18:43 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
Jul 17, 2:49 PM EDT	TSTM WND GST 58	Newark Airport, NJ

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
Jul 17, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.7 hours before the alert went out and 101 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.

116 
WUUS51 KOKX 171842
SVROKX
NJC003-013-017-039-NYC061-171930-
/O.NEW.KOKX.SV.W.0055.210717T1842Z-210717T1930Z/

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

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Hudson County in northeastern New Jersey...
  Northeastern Union County in northeastern New Jersey...
  Southeastern Bergen County in northeastern New Jersey...
  Southeastern Essex County in northeastern New Jersey...
  New York (Manhattan) County in southeastern New York...

* Until 330 PM EDT.

* At 241 PM EDT, a severe thunderstorm was located over Kearny, or
  over Harrison, moving northeast at 20 mph.

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

  SOURCE...Public.

  IMPACT...Minor hail damage to vehicles is possible. Expect wind 
           damage to trees and power lines.

* This severe thunderstorm will be near...
  Jersey City around 245 PM EDT.
  SoHo around 250 PM EDT.
  Hoboken, Lyndhurst, Rutherford, Secaucus, Union City and East 
  Village around 255 PM EDT.
  Midtown Manhattan, Teterboro and Upper West Side around 305 PM 
  EDT.
  Ridgefield around 310 PM EDT.
  Hackensack, Harlem and Fort Lee around 315 PM EDT.
  Paramus and Englewood around 320 PM EDT.
  Bergenfield and Oradell around 325 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm has a history of producing 1 inch hail and damaging 
winds. Prepare immediately for large hail and damaging winds. People 
outside should move immediately to shelter inside a strong building. 
Stay away from windows.

Continuous cloud to ground lightning is also occurring with this 
storm. Move indoors immediately. Lightning is one of nature's 
leading killers. Remember, if you can hear thunder, you are close 
enough to be struck by lightning.

&&

LAT...LON 4068 7426 4083 7415 4082 7413 4082 7412
      4086 7412 4086 7411 4088 7412 4098 7405
      4089 7393 4088 7393 4087 7391 4084 7393
      4081 7393 4079 7391 4078 7394 4073 7398
      4064 7413 4065 7419 4062 7420
TIME...MOT...LOC 1841Z 219DEG 18KT 4073 7412 

HAIL...1.00IN
WIND...60MPH
 
$$

Goodman

1 follow-up statement

197 
WWUS51 KOKX 171915
SVSOKX

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

NJC003-013-017-039-NYC061-171925-
/O.CAN.KOKX.SV.W.0055.000000T0000Z-210717T1930Z/
Hudson NJ-Union NJ-Bergen NJ-Essex NJ-New York (Manhattan) NY-
315 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR HUDSON...NORTHEASTERN UNION...
SOUTHEASTERN BERGEN...SOUTHEASTERN ESSEX AND NEW YORK (MANHATTAN)
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 and 
heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 11 PM. 

LAT...LON 4068 7426 4083 7415 4082 7413 4082 7412
      4086 7412 4086 7411 4088 7412 4098 7405
      4089 7393 4088 7393 4087 7391 4084 7393
      4081 7393 4079 7391 4078 7394 4073 7398
      4064 7413 4065 7419 4062 7420
TIME...MOT...LOC 1914Z 219DEG 18KT 4086 7398 

$$

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	Hudson	32 min
Jul 17, 1:55 PM EDT	Special Weather Statement	OKX	Hudson	50 min
Jul 17, 2:01 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Essex, Hudson, Union	44 min
Jul 17, 2:10 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Union	95 min
Jul 17, 2:20 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Hudson, Union	3 hr
Jul 17, 2:49 PM EDT	Special Weather Statement	OKX	Union	41 min
Jul 17, 2:50 PM EDT	Special Weather Statement	OKX	Bergen, Passaic	55 min
Jul 17, 3:00 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Passaic, Union	113 min
Jul 17, 3:18 PM EDT	Severe Thunderstorm Warning	OKX	Essex, Hudson, Union	42 min
Jul 17, 3:24 PM EDT	Flash Flood Warning	OKX	Union	80 min
Jul 17, 6:40 PM EDT	Special Weather Statement	OKX	Union	50 min
Jul 17, 6:41 PM EDT	Areal Flood Advisory	OKX	Essex, Union	94 min
Jul 17, 7:23 PM EDT	Areal Flood Advisory	OKX	Bergen, Passaic	112 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, 3:10 PM EDT	Tornado Warning	OKX	Richmond	19 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

Severe Thunderstorm Warnings in New Jersey, 2021 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.