Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 54, 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, 2:01 PM EDT for 4 counties in New Jersey; New York County, New York. It was in force for 44 min. 2 reports 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, 2:01 PM EDT (18:01 UTC)
Expired: Jul 17, 2021, 2:45 PM EDT
In force: 44 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), 91 km from the middle of the area, began a volume at 18:04 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, 2:25 PM EDT	HAIL 1	2 Se Newark, NJ
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, 6.0 hours before the alert went out and 102 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.

607 
WUUS51 KOKX 171801
SVROKX
NJC003-013-017-039-NYC061-171845-
/O.NEW.KOKX.SV.W.0054.210717T1801Z-210717T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
201 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...
  South central Bergen County in northeastern New Jersey...
  Southeastern Essex County in northeastern New Jersey...
  New York (Manhattan) County in southeastern New York...

* Until 245 PM EDT.

* At 201 PM EDT, a severe thunderstorm was located over Newark,
  moving northeast at 15 mph.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Bayonne around 205 PM EDT.
  Harrison around 210 PM EDT.
  Kearny around 215 PM EDT.
  Jersey City around 220 PM EDT.
  Secaucus and Battery Park around 230 PM EDT.
  Hoboken, Lower East Side, Union City and SoHo around 235 PM EDT.
  East Village around 240 PM EDT.
  Ridgefield, Midtown Manhattan and Upper West Side around 245 PM 
  EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is 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 4069 7425 4087 7401 4078 7392 4078 7394
      4077 7394 4074 7396 4072 7396 4072 7397
      4064 7417 4065 7419 4063 7420
TIME...MOT...LOC 1801Z 237DEG 12KT 4069 7415 

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

Goodman

1 follow-up statement

623 
WWUS51 KOKX 171818
SVSOKX

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

NJC003-013-017-039-NYC061-171845-
/O.CON.KOKX.SV.W.0054.000000T0000Z-210717T1845Z/
Hudson NJ-Union NJ-Bergen NJ-Essex NJ-New York (Manhattan) NY-
218 PM EDT Sat Jul 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR HUDSON...NORTHEASTERN UNION...SOUTH CENTRAL BERGEN...SOUTHEASTERN
ESSEX AND NEW YORK (MANHATTAN) COUNTIES...

At 217 PM EDT, a severe thunderstorm was located over Newark, moving
northeast at 20 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vehicles is possible. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

This severe storm will be near...
  Jersey City and Kearny around 230 PM EDT.
  Battery Park around 235 PM EDT.
  Hoboken, Secaucus, Lower East Side and SoHo around 240 PM EDT.
  Union City and East Village around 245 PM EDT.
  Midtown Manhattan around 250 PM EDT.
  Ridgefield and Upper West Side around 255 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4069 7425 4087 7401 4078 7392 4078 7394
      4077 7394 4074 7396 4072 7396 4072 7397
      4064 7417 4065 7419 4063 7420
TIME...MOT...LOC 1817Z 234DEG 16KT 4070 7416 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

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, 2:10 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, 2:42 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Essex, Hudson, Union	33 min
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.