Alert archive / New Jersey / Tornado Warnings in 2020

Tornado Warning 30, NWS Philadelphia/Mount Holly

August 7, 2020Gloucester County, Salem County, New Jersey; New Castle County, Delaware; Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 7, 2020, 6:00 PM EDT for Gloucester County, Salem County, New Jersey; New Castle County, Delaware; Delaware County, Pennsylvania. It was in force for 30 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
Aug 7, 2020, 6:00 PM EDT (22:00 UTC)
Expired
Aug 7, 2020, 6:30 PM EDT
In force
30 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Delaware County, PA

The radar

The Philadelphia radar (KDIX), 85 km from the middle of the area, began a volume at 22:02 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.0 hours before the alert went out and 196 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, Washington/Dulle, VA at 12:00Z on 2020-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 301 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2020-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 square meters per square second.193958Sfc1 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
301 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
665 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

598 
WFUS51 KPHI 072200
TORPHI
DEC003-NJC015-033-PAC045-072230-
/O.NEW.KPHI.TO.W.0030.200807T2200Z-200807T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
600 PM EDT Fri Aug 7 2020

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Northeastern New Castle County in northern Delaware...
  Northwestern Salem County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Southeastern Delaware County in southeastern Pennsylvania...

* Until 630 PM EDT.
    
* At 600 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Arden, or near Wilmington, moving east at 25 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...
  Wilmington, Chester, West Deptford, Carneys Point, Paulsboro, Penns
  Grove, Woodstown, National Park, Swedesboro, Arden, Beckett,
  Mullica Hill, Gibbstown, Tinicum Township, Chester Township,
  Eddystone, Marcus Hook, Trainer, Bellefonte and Ardentown.

This includes the following highways...
 New Jersey Turnpike between exits 1 and 2.
 Interstate 95 in Pennsylvania between mile markers 0 and 3.
 Interstate 95 in Delaware between mile markers 19 and 23.
 Interstate 295 in New Jersey between mile markers 3 and 21.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 3983 7549 3987 7519 3956 7520 3971 7552
TIME...MOT...LOC 2200Z 279DEG 21KT 3977 7546 

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

$$

Robertson
1 follow-up statement
027 
WWUS51 KPHI 072220
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
620 PM EDT Fri Aug 7 2020

DEC003-PAC045-072229-
/O.CAN.KPHI.TO.W.0030.000000T0000Z-200807T2230Z/
New Castle DE-Delaware PA-
620 PM EDT Fri Aug 7 2020

...THE TORNADO WARNING FOR NORTHEASTERN NEW CASTLE AND SOUTHEASTERN
DELAWARE 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 warning remains in effect.

LAT...LON 3971 7543 3981 7538 3980 7519 3979 7519
      3961 7525
TIME...MOT...LOC 2219Z 288DEG 14KT 3974 7537 

$$

NJC015-033-072230-
/O.CON.KPHI.TO.W.0030.000000T0000Z-200807T2230Z/
Salem NJ-Gloucester NJ-
620 PM EDT Fri Aug 7 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR NORTH
CENTRAL SALEM AND WEST CENTRAL GLOUCESTER COUNTIES...
    
At 619 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Beckett, or 8 miles east of Wilmington, 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.

Locations impacted include...
Woodstown, Swedesboro, Beckett and Mullica Hill. 

This includes the following highways...
 New Jersey Turnpike near exit 2.
 Interstate 295 in New Jersey between mile markers 6 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 3971 7543 3981 7538 3980 7519 3979 7519
      3961 7525
TIME...MOT...LOC 2219Z 288DEG 14KT 3974 7537 

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

$$

Robertson

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 5:15 PM EDTAreal Flood AdvisoryPHIHunterdon, Warren3 hr
Aug 7, 5:25 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Salem3 hr
Aug 7, 5:43 PM EDTFlash Flood WarningPHICamden, Gloucester4 hr
Aug 7, 5:57 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Salem48 min
Aug 7, 6:08 PM EDTAreal Flood AdvisoryPHICumberland, Gloucester, Salem3 hr
Aug 7, 6:16 PM EDTAreal Flood AdvisoryPHIMercer2 hr
Aug 7, 6:24 PM EDTSpecial Marine WarningPHI66 min
Aug 7, 6:39 PM EDTSevere Thunderstorm WarningPHIBurlington, Hunterdon, Mercer27 min
Aug 7, 6:41 PM EDTSevere Thunderstorm WarningPHIAtlantic, Camden, Cumberland, Gloucester, Salem49 min
Aug 7, 6:57 PM EDTSevere Thunderstorm WarningPHIAtlantic, Camden, Cumberland, Gloucester, Salem48 min
Aug 7, 7:24 PM EDTSpecial Marine WarningPHI66 min
Aug 7, 7:25 PM EDTFlash Flood WarningPHIAtlantic, Cape May, Cumberland, Gloucester4 hr
Aug 7, 7:28 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more62 min
Aug 7, 5:03 PM EDTFlash Flood WarningPHINew Castle5 hr
Aug 7, 5:38 PM EDTSevere Thunderstorm WarningPHINew Castle52 min
Aug 7, 5:49 PM EDTTornado WarningPHINew Castle26 min
Aug 7, 6:12 PM EDTSevere Thunderstorm WarningPHIKent, New Castle63 min
Aug 7, 6:43 PM EDTAreal Flood AdvisoryPHIKent, New Castle4 hr
Aug 7, 7:04 PM EDTSevere Thunderstorm WarningPHIKent, New Castle41 min
Aug 7, 7:21 PM EDTFlash Flood WarningPHIKent, New Castle5 hr
Aug 7, 7:28 PM EDTRiver Flood WarningPHINew Castle2 hr
Aug 7, 7:36 PM EDTSpecial Weather StatementPHIKent39 min
Aug 7, 6:49 AM EDTAreal Flood AdvisoryPHIBerks4 hr
Aug 7, 9:22 AM EDTAreal Flood AdvisoryPHIBucks3 hr
Aug 7, 10:34 AM EDTSevere Thunderstorm WarningPHICarbon, Lehigh56 min
Aug 7, 11:28 AM EDTSpecial Weather StatementPHICarbon, Lehigh47 min
Aug 7, 2:34 PM EDTAreal Flood AdvisoryPHIBerks4 hr
Aug 7, 3:46 PM EDTAreal Flood AdvisoryPHICarbon, Lehigh, Northampton4 hr
Aug 7, 4:10 PM EDTFlash Flood WarningPHIBerks2 hr
Aug 7, 4:20 PM EDTAreal Flood AdvisoryPHIChester, Montgomery4 hr
Aug 7, 4:32 PM EDTFlash Flood WarningPHIChester3 hr
Aug 7, 4:47 PM EDTSpecial Weather StatementPHIChester28 min
Aug 7, 5:00 PM EDTSevere Thunderstorm WarningPHIChester60 min
Aug 7, 7:10 PM EDTRiver Flood WarningPHIDelaware7 hr
Aug 7, 7:17 PM EDTAreal Flood WarningPHIBucks, Montgomery3 hr

Nearby

Tornado Warnings in New Jersey, 2020Tornado Warnings in Delaware, 2020Tornado Warnings in Pennsylvania, 2020Every tornado warning in 2020Tornadoes in 2020

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.