Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS New York, NY

July 12, 2021Bergen County, Essex County, Passaic County, New Jersey; Orange County, Rockland County, New York

NWS New York, NY issued this severe thunderstorm warning at Jul 12, 2021, 6:58 PM EDT for Bergen County, Essex County, Passaic County, New Jersey; Orange County, Rockland County, New York. It was in force for 41 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 12, 2021, 6:58 PM EDT (22:58 UTC)
Expired: Jul 12, 2021, 7:39 PM EDT
In force: 41 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Bergen County, NJ, Essex County, NJ, Passaic County, NJ, Orange County, NY, Rockland County, NY

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 22:57 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 12, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.0 hours before the alert went out and 123 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: 857 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

163 
WUUS51 KOKX 122258
SVROKX
NJC003-013-031-NYC071-087-130000-
/O.NEW.KOKX.SV.W.0051.210712T2258Z-210713T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
658 PM EDT Mon Jul 12 2021

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Passaic County in northeastern New Jersey...
  Northern Bergen County in northeastern New Jersey...
  Northwestern Essex County in northeastern New Jersey...
  Southern Orange County in southeastern New York...
  Rockland County in southeastern New York...

* Until 800 PM EDT.

* At 658 PM EDT, severe thunderstorms were located along a line
  extending from near Monsey to Butler to near Hopatcong, moving east
  at 10 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.

* Locations impacted include...
  Paterson, Wayne, New City, West Milford, Ridgewood, Monsey, Nanuet,
  Ramsey, Ringwood, Pompton Lakes, Suffern, Caldwell, Nyack,
  Sloatsburg and Hawthorne.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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 these storms. 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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4109 7450 4120 7437 4124 7427 4113 7389
      4109 7389 4082 7430 4083 7433 4086 7432
      4089 7434 4091 7433 4089 7428 4090 7427
      4093 7429 4097 7428 4100 7430 4103 7442
      4102 7443 4105 7445 4104 7450 4107 7449
TIME...MOT...LOC 2258Z 276DEG 9KT 4113 7403 4098 7434 4098 7461 

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

JM

1 follow-up statement

742 
WWUS51 KOKX 122339
SVSOKX

Severe Weather Statement
National Weather Service New York NY
739 PM EDT Mon Jul 12 2021

NJC003-013-031-NYC071-087-122348-
/O.CAN.KOKX.SV.W.0051.000000T0000Z-210713T0000Z/
Passaic NJ-Bergen NJ-Essex NJ-Orange NY-Rockland NY-
739 PM EDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR PASSAIC...NORTHERN BERGEN...
NORTHWESTERN ESSEX...SOUTHERN ORANGE AND ROCKLAND COUNTIES IS
CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However heavy rain is
still expected with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northeastern New Jersey and parts of Southeast New York.

LAT...LON 4109 7450 4120 7437 4124 7427 4113 7389
      4109 7389 4082 7430 4083 7433 4086 7432
      4089 7434 4091 7433 4089 7428 4090 7427
      4093 7429 4097 7428 4100 7430 4103 7442
      4102 7443 4105 7445 4104 7450 4107 7449
TIME...MOT...LOC 2337Z 276DEG 9KT 4112 7390 4097 7421 4097 7448 

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 2:18 AM EDT	Special Weather Statement	OKX	Hudson	42 min
Jul 12, 3:53 PM EDT	Areal Flood Advisory	OKX	Union	49 min
Jul 12, 4:18 PM EDT	Areal Flood Advisory	OKX	Bergen, Hudson	52 min
Jul 12, 4:55 PM EDT	Areal Flood Advisory	OKX	Bergen	32 min
Jul 12, 5:38 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Passaic	112 min
Jul 12, 5:41 PM EDT	Special Weather Statement	OKX	Passaic	49 min
Jul 12, 5:51 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Passaic	39 min
Jul 12, 6:09 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Passaic	3 hr
Jul 12, 6:15 PM EDT	Tornado Warning	OKX	Bergen, Passaic	45 min
Jul 12, 3:37 PM EDT	Special Marine Warning	OKX		38 min
Jul 12, 3:45 PM EDT	Special Weather Statement	OKX	Richmond	30 min
Jul 12, 7:46 PM EDT	Areal Flood Advisory	OKX	Orange	119 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.