Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 71, NWS Philadelphia/Mount Holly

June 20, 2020Bucks County, Philadelphia County, Pennsylvania; Burlington County, Camden County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 20, 2020, 3:43 PM EDT for Bucks County, Philadelphia County, Pennsylvania; Burlington County, Camden County, New Jersey. It was in force for 32 min. 3 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 20, 2020, 3:43 PM EDT (19:43 UTC)
Expired: Jun 20, 2020, 4:15 PM EDT
In force: 32 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 48 km from the middle of the area, began a volume at 19:45 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
Jun 20, 3:46 PM EDT	HAIL 0.7	Cherry Hill Twp, NJ	VIDEO OF PEA TO DIME-SIZE HAIL FALLING.
Jun 20, 3:51 PM EDT	TSTM WND DMG	1 Nne Maple Shade, NJ	A FEW REPORTS OF DOWNED TREE LIMBS AND WIRES IN VICINITY OF LENOLA ROAD AND CHURCH STREET.
Jun 20, 4:02 PM EDT	TSTM WND DMG	1 Ssw Rancocas, NJ	A COUPLE OF REPORTS OF TREES AND WIRES DOWN NEAR CREEK ROAD. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.7 hours before the alert went out and 204 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: 255 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 913 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

856 
WUUS51 KPHI 201943
SVRPHI
NJC005-007-PAC017-101-202030-
/O.NEW.KPHI.SV.W.0071.200620T1943Z-200620T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
343 PM EDT Sat Jun 20 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Camden County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...
  Central Philadelphia County in southeastern Pennsylvania...

* Until 430 PM EDT.

* At 343 PM EDT, a severe thunderstorm was located over Golden
  Triangle, or near Camden, moving north at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Bensalem,
  Evesham, Mount Laurel, Willingboro, Voorhees, Lindenwold, Bellmawr,
  Burlington, Bristol, Riverside, Palmyra, Magnolia, Westville,
  Beverly, Brooklawn and Audubon Park.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 5.
 Interstate 95 in Pennsylvania near mile marker 18, and between mile
markers 25 and 38.
 Interstate 76 in Pennsylvania near mile marker 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 27 and 51.
 Interstate 676 in New Jersey between mile markers 0 and 4.

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.

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

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

&&

LAT...LON 3981 7493 3989 7516 4012 7503 4013 7502
      4007 7475
TIME...MOT...LOC 1943Z 198DEG 14KT 3993 7502 

HAIL...<.75IN
WIND...60MPH
 
$$

NC

1 follow-up statement

935 
WWUS51 KPHI 202015
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
415 PM EDT Sat Jun 20 2020

NJC005-007-PAC017-101-202021-
/O.CAN.KPHI.SV.W.0071.000000T0000Z-200620T2030Z/
Camden NJ-Burlington NJ-Bucks PA-Philadelphia PA-
415 PM EDT Sat Jun 20 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...
NORTHWESTERN BURLINGTON...SOUTHEASTERN BUCKS AND CENTRAL PHILADELPHIA
COUNTIES IS CANCELLED...
                
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 has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3981 7493 3989 7516 4012 7503 4013 7502
      4007 7475
TIME...MOT...LOC 2010Z 198DEG 14KT 4003 7498 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 2:19 PM EDT	Areal Flood Advisory	PHI	Chester	2 hr
Jun 20, 4:09 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Jun 20, 4:10 PM EDT	Special Weather Statement	PHI	Philadelphia	35 min
Jun 20, 5:27 PM EDT	Special Weather Statement	PHI	Bucks	33 min
Jun 20, 5:53 PM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jun 19, 8:55 PM EDT	Special Weather Statement	PHI	Sussex	35 min
Jun 20, 12:32 PM EDT	Areal Flood Advisory	PHI	Salem	4 hr
Jun 20, 2:57 PM EDT	Special Weather Statement	PHI	Gloucester	33 min
Jun 20, 3:20 PM EDT	Areal Flood Advisory	PHI	Camden, Gloucester	4 hr
Jun 20, 3:29 PM EDT	Special Weather Statement	PHI	Camden, Gloucester	31 min
Jun 20, 3:34 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester	4 hr
Jun 20, 4:08 PM EDT	Special Weather Statement	PHI	Burlington	37 min
Jun 20, 5:00 PM EDT	Special Weather Statement	PHI	Hunterdon	30 min
Jun 20, 5:30 PM EDT	Special Weather Statement	PHI	Union	15 min
Jun 20, 5:53 PM EDT	Special Weather Statement	PHI	Morris, Sussex	52 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Severe Thunderstorm Warnings in New Jersey, 2020 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.