Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 58, NWS Philadelphia/Mount Holly

June 4, 2021Philadelphia County, Pennsylvania; Burlington County, Camden County, Gloucester County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 4, 2021, 4:20 PM EDT for Philadelphia County, Pennsylvania; Burlington County, Camden County, Gloucester County, New Jersey. It was in force for 40 min. 5 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
Jun 4, 2021, 4:20 PM EDT (20:20 UTC)
Expired
Jun 4, 2021, 5:00 PM EDT
In force
40 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 48 km from the middle of the area, began a volume at 20:22 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

TimeReportWhereRemark
Jun 4, 4:22 PM EDTTSTM WND DMG1 Nw Woodlynne, NJSEVERAL REPORTS OF DOWNED WIRES IN THE WOODLYNNE AREA. TIME ESTIMATED FROM RADAR.
Jun 4, 4:30 PM EDTTSTM WND DMG1 Ssw Cherry Hill Twp, NJA DELAYED MPING REPORT OF A SNAPPED OR UPROOTED TREE. TIME ESTIMATED FROM RADAR.
Jun 4, 4:42 PM EDTTSTM WND DMGMedford Twp., NJDOWNED WIRES NEAR THE INTERSECTION OF MOUNT HOLLY ROAD AND GARWOOD COURT. TIME ESTIMATED FROM RADAR.
Jun 4, 4:46 PM EDTTSTM WND DMG1 Ssw Medford Lakes, NJDOWNED WIRES NEAR SUNRISE TRAIL. TIME ESTIMATED FROM RADAR.
Jun 4, 4:50 PM EDTTSTM WND DMGEvesboro, NJA COUPLE OF REPORTS OF DOWNED WIRES NEAR UNION MILL ROAD. TIME ESTIMATED FROM RADAR.

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.

IssuedProductOfficeLasted
Jun 4, 3:09 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.3 hours before the alert went out and 210 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 12:00Z on 2021-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 233 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 12:00Z on 2021-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.1939587897Sfc1 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
233 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
526 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

752 
WUUS51 KPHI 042020
SVRPHI
NJC005-007-015-PAC101-042100-
/O.NEW.KPHI.SV.W.0058.210604T2020Z-210604T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
420 PM EDT Fri Jun 4 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Camden County in southern New Jersey...
  North central Gloucester County in southern New Jersey...
  Central Burlington County in southern New Jersey...
  South central Philadelphia County in southeastern Pennsylvania...

* Until 500 PM EDT.

* At 420 PM EDT, a severe thunderstorm was located over Golden
  Triangle, or over Camden, moving east at 25 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Evesham, Mount
  Laurel, Voorhees, Medford, Lindenwold, Bellmawr, Berlin,
  Tabernacle, Shamong, Magnolia, Westville, National Park, Brooklawn,
  Audubon Park, Atsion and Barclay-Kingston.

People at the Burlington County Mega Site should seek safe shelter
immediately!

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Interstate 95 in Pennsylvania between mile markers 16 and 25.
 Interstate 76 in Pennsylvania between mile markers 350 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 24 and 39.
 Interstate 676 in New Jersey between mile markers 0 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3987 7520 4000 7514 3988 7462 3971 7468
TIME...MOT...LOC 2020Z 285DEG 24KT 3992 7506 

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

JEO
2 follow-up statements
431 
WWUS51 KPHI 042046
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
446 PM EDT Fri Jun 4 2021

NJC015-042055-
/O.CAN.KPHI.SV.W.0058.000000T0000Z-210604T2100Z/
Gloucester NJ-
446 PM EDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL GLOUCESTER
COUNTY IS CANCELLED...
    
The severe 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 800 PM EDT for
southern New Jersey...and southeastern Pennsylvania.

LAT...LON 3971 7468 3986 7503 3989 7517 3997 7508
      3997 7502 3988 7462
TIME...MOT...LOC 2045Z 285DEG 24KT 3988 7484 

$$

NJC005-007-PAC101-042100-
/O.CON.KPHI.SV.W.0058.000000T0000Z-210604T2100Z/
Camden NJ-Burlington NJ-Philadelphia PA-
446 PM EDT Fri Jun 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR CENTRAL CAMDEN...CENTRAL BURLINGTON AND SOUTHERN PHILADELPHIA
COUNTIES...

At 445 PM EDT, a severe thunderstorm was located over Medford, or 14
miles east of Gloucester City, moving east at 30 mph.

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

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Evesham, Mount
Laurel, Voorhees, Medford, Bellmawr, Tabernacle, Shamong, Magnolia,
Westville, Brooklawn, Audubon Park, Ramblewood, Atsion,
Barclay-Kingston, Cherry Hill Mall and Echelon.

People at the Burlington County Mega Site should seek safe shelter
immediately!

This includes the following highways...
 New Jersey Turnpike near exit 4.
 Interstate 95 in Pennsylvania near mile marker 18.
 Interstate 76 in Pennsylvania near mile marker 351.
 Interstate 76 in New Jersey between mile markers 1 and 3.
 Interstate 295 in New Jersey between mile markers 28 and 39.
 Interstate 676 in New Jersey between mile markers 0 and 3.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3971 7468 3986 7503 3989 7517 3997 7508
      3997 7502 3988 7462
TIME...MOT...LOC 2045Z 285DEG 24KT 3988 7484 

HAIL...0.75IN
WIND...60MPH
 
$$

JEO
126 
WWUS51 KPHI 042051 RRA
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
451 PM EDT Fri Jun 4 2021

NJC005-007-PAC101-042101-
/O.EXP.KPHI.SV.W.0058.000000T0000Z-210604T2100Z/
Camden NJ-Burlington NJ-Philadelphia PA-
451 PM EDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CAMDEN...CENTRAL
BURLINGTON AND SOUTHERN PHILADELPHIA COUNTIES WILL EXPIRE AT 500 PM
EDT...
                
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 will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern New Jersey...and southeastern Pennsylvania.

LAT...LON 3971 7468 3986 7503 3989 7517 3997 7508
      3997 7502 3988 7462
TIME...MOT...LOC 2051Z 285DEG 24KT 4000 7428 

$$

JEO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 3, 8:44 PM EDTSevere Thunderstorm WarningPHIBucks30 min
Jun 4, 1:02 PM EDTSpecial Weather StatementPHILehigh28 min
Jun 4, 1:07 PM EDTSpecial Weather StatementPHICarbon, Monroe38 min
Jun 4, 1:29 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh2 hr
Jun 4, 1:45 PM EDTAreal Flood AdvisoryPHIMonroe, Northampton97 min
Jun 4, 1:49 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton41 min
Jun 4, 2:21 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Montgomery21 min
Jun 4, 2:24 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery51 min
Jun 4, 2:27 PM EDTSevere Thunderstorm WarningPHIBerks48 min
Jun 4, 3:14 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery, Philadelphia46 min
Jun 4, 3:16 PM EDTAreal Flood AdvisoryPHIBucks, Chester, Delaware, Montgomery, Philadelphia98 min
Jun 4, 3:18 PM EDTSevere Thunderstorm WarningPHIBucks42 min
Jun 4, 3:23 PM EDTSevere Thunderstorm WarningPHIBucks67 min
Jun 4, 3:46 PM EDTSevere Thunderstorm WarningPHIBucks, Philadelphia44 min
Jun 3, 8:14 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth, Ocean19 min
Jun 3, 8:55 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth10 min
Jun 4, 2:43 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset, Sussex, Warren62 min
Jun 4, 2:49 PM EDTAreal Flood AdvisoryPHIHunterdon, Middlesex, Morris, Somerset, Sussex, Warren70 min
Jun 4, 4:12 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean63 min
Jun 4, 4:22 PM EDTSpecial Marine WarningPHI53 min
Jun 4, 4:23 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean52 min
Jun 4, 4:30 PM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth, Ocean63 min
Jun 4, 5:09 PM EDTSpecial Marine WarningPHI2 hr
Jun 4, 5:12 PM EDTSevere Thunderstorm WarningPHIOcean18 min
Jun 4, 5:32 PM EDTSpecial Marine WarningPHI58 min
Jun 4, 6:18 PM EDTSpecial Weather StatementPHIAtlantic42 min
Jun 4, 6:27 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland48 min
Jun 4, 7:13 PM EDTSpecial Marine WarningPHI62 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021Severe Thunderstorm Warnings in Pennsylvania, 2021Every 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.