Alert archive / New Jersey / Tornado Warnings in 2021

Tornado Warning 15, NWS Philadelphia/Mount Holly

July 17, 2021Burlington County, Monmouth County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 17, 2021, 10:38 PM EDT for Burlington County, Monmouth County, Ocean County, New Jersey. 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, 10:38 PM EDT (02:38 UTC)
Expired
Jul 17, 2021, 10:54 PM EDT
In force
16 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Burlington County, NJ, Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 18 km from the middle of the area, began a volume at 02:38 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.

IssuedProductOfficeLasted
Jul 17, 1:13 PM EDTSevere Thunderstorm WatchSPC10 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 2.6 hours before the alert went out and 161 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2021-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1431 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1431 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
988 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
54 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

As transmitted.

759 
WFUS51 KPHI 180238
TORPHI
NJC005-025-029-180315-
/O.NEW.KPHI.TO.W.0015.210718T0238Z-210718T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1038 PM EDT Sat Jul 17 2021

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Northwestern Ocean County in southern New Jersey...
  Northeastern Burlington County in southern New Jersey...
  Southwestern Monmouth County in central New Jersey...

* Until 1115 PM EDT.
    
* At 1038 PM EDT, a severe thunderstorm capable of producing a
  tornado was located near Cream Ridge, or 14 miles southeast of
  Trenton, moving east at 50 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.

* Locations impacted include...
  Jackson, Cassville, Vista Center, Cream Ridge, Jacksons Mills, Six
  Flags Theme Park and New Egypt.

This includes Interstate 195 in New Jersey between mile markers 15
and 22.
 
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 4006 7460 4011 7461 4021 7436 4008 7424
TIME...MOT...LOC 0238Z 261DEG 41KT 4008 7456 

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

$$

JEO
2 follow-up statements
334 
WWUS51 KPHI 180249
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1049 PM EDT Sat Jul 17 2021

NJC005-025-180258-
/O.CAN.KPHI.TO.W.0015.000000T0000Z-210718T0315Z/
Burlington NJ-Monmouth NJ-
1049 PM EDT Sat Jul 17 2021

...THE TORNADO WARNING FOR NORTHEASTERN BURLINGTON AND SOUTHWESTERN
MONMOUTH COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and southern New Jersey.

LAT...LON 4008 7424 4007 7448 4011 7447 4014 7445
      4016 7442 4017 7438 4017 7432
TIME...MOT...LOC 0248Z 261DEG 41KT 4010 7440 

$$

NJC029-180315-
/O.CON.KPHI.TO.W.0015.000000T0000Z-210718T0315Z/
Ocean NJ-
1049 PM EDT Sat Jul 17 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT FOR
NORTHWESTERN OCEAN COUNTY...
    
At 1048 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Cassville, or 13 miles northwest of Toms River,
moving east at 45 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.

Locations impacted include...
Jackson, Cassville, Jacksons Mills, Vista Center and Six Flags Theme
Park.

This includes Interstate 195 in New Jersey between mile markers 17
and 23.
 
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 4008 7424 4007 7448 4011 7447 4014 7445
      4016 7442 4017 7438 4017 7432
TIME...MOT...LOC 0248Z 261DEG 41KT 4010 7440 

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

$$

JEO
571 
WWUS51 KPHI 180254
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1054 PM EDT Sat Jul 17 2021

NJC029-180303-
/O.CAN.KPHI.TO.W.0015.000000T0000Z-210718T0315Z/
Ocean NJ-
1054 PM EDT Sat Jul 17 2021

...THE TORNADO WARNING FOR NORTHWESTERN OCEAN COUNTY IS CANCELLED...
                
The rotation which prompted the warning has weakened, and no longer 
appears capable of producing a tornado. Therefore, the warning has 
been cancelled.

Remember, a Severe Thunderstorm Warning still remains in effect for
the area for damaging straight line winds.

LAT...LON 4008 7424 4007 7448 4011 7447 4014 7445
      4016 7442 4017 7438 4017 7432
TIME...MOT...LOC 0252Z 261DEG 41KT 4011 7433 

$$

JEO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 17, 8:00 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Mercer, Monmouth45 min
Jul 17, 8:09 PM EDTFlash Flood WarningPHIMercer, Somerset4 hr
Jul 17, 8:35 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester40 min
Jul 17, 8:36 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean, Somerset54 min
Jul 17, 8:46 PM EDTSpecial Marine WarningPHI59 min
Jul 17, 8:53 PM EDTAreal Flood AdvisoryPHIMercer, Middlesex, Monmouth3 hr
Jul 17, 9:25 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Salem2 hr
Jul 17, 9:27 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem48 min
Jul 17, 9:30 PM EDTSevere Thunderstorm WarningPHICape May29 min
Jul 17, 9:36 PM EDTFlash Flood WarningPHICamden, Gloucester, Salem2 hr
Jul 17, 9:44 PM EDTSpecial Marine WarningPHI61 min
Jul 17, 9:48 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Mercer, Salem42 min
Jul 17, 10:21 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean54 min
Jul 17, 10:22 PM EDTTornado WarningPHIBurlington, Monmouth, Ocean23 min
Jul 17, 10:27 PM EDTSpecial Weather StatementPHIBurlington, Camden33 min
Jul 17, 10:43 PM EDTFlash Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean79 min
Jul 17, 10:47 PM EDTSpecial Marine WarningPHI118 min
Jul 17, 10:51 PM EDTSpecial Marine WarningPHI114 min
Jul 17, 11:07 PM EDTSpecial Weather StatementPHIMiddlesex38 min
Jul 17, 11:08 PM EDTAreal Flood WarningPHIHunterdon12 hr
Jul 17, 11:11 PM EDTSpecial Weather StatementPHIMonmouth, Ocean34 min
Jul 17, 11:20 PM EDTSpecial Marine WarningPHI115 min
Jul 17, 11:26 PM EDTAreal Flood WarningPHISomerset10 hr
Jul 18, 2:41 AM EDTAreal Flood WarningPHIMercer4 hr
Jul 18, 3:48 AM EDTRiver Flood WarningPHIMercer3 hr
Jul 18, 9:08 AM EDTAreal Flood WarningPHISomerset2 hr
Jul 18, 11:03 AM EDTRiver Flood WarningPHIMiddlesex, Somerset88 min

Nearby

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