Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 140, NWS Philadelphia/Mount Holly

July 6, 2021Bucks County, Montgomery County, Philadelphia County, Pennsylvania; Burlington County, Camden County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2021, 10:21 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania; Burlington County, Camden County, New Jersey. It was in force for 39 min. 2 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: Jul 6, 2021, 10:21 PM EDT (02:21 UTC)
Expired: Jul 6, 2021, 11:00 PM EDT
In force: 39 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, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 02:24 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
Jul 6, 11:04 PM EDT	TSTM WND DMG	2 E Northeast Philadelp, PA	TRESS SLICED IN HALF, MULTIPLE LARGE AND SMALL BRANCHES DOWN. BRANCHES ARE ALSO DOWN ON DECATUR RD AND PALMER PLAYGROUND. TIME ESTIMATED FROM RADAR.
Jul 6, 11:09 PM EDT	TSTM WND DMG	Tacony, PA	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF. TIME CORRECT BASED ON 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 00:00Z, 2.4 hours before the alert went out and 206 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: 1647 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 876 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: 93 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

613 
WUUS51 KPHI 070221
SVRPHI
NJC005-007-PAC017-091-101-070300-
/O.NEW.KPHI.SV.W.0140.210707T0221Z-210707T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1021 PM EDT Tue Jul 6 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  North central Camden County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  South central Bucks County in southeastern Pennsylvania...
  Northern Philadelphia County in southeastern Pennsylvania...

* Until 1100 PM EDT.

* At 1021 PM EDT, a severe thunderstorm was located over Jenkintown,
  or near Philadelphia, moving southeast at 35 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, Bensalem, Mount Laurel, Willingboro, Medford,
  Lumberton, Burlington, Mount Holly, Riverside, Palmyra, Hatboro,
  Ambler, Jenkintown, Beverly, Rockledge, Abington, Pemberton, Bryn
  Athyn, Wrightstown and Wissinoming.

This includes the following highways...
 New Jersey Turnpike between exits 4 and 5.
 Pennsylvania Turnpike between mile markers 337 and 344.
 Interstate 95 in Pennsylvania between mile markers 25 and 38.
 Interstate 295 in New Jersey between mile markers 36 and 50.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4006 7527 4020 7520 4002 7464 3984 7481
TIME...MOT...LOC 0221Z 294DEG 30KT 4009 7516 

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

MPS

2 follow-up statements

103 
WWUS51 KPHI 070249
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1049 PM EDT Tue Jul 6 2021

NJC007-PAC017-091-101-070259-
/O.CAN.KPHI.SV.W.0140.000000T0000Z-210707T0300Z/
Camden NJ-Montgomery PA-Bucks PA-Philadelphia PA-
1049 PM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CAMDEN...
SOUTHEASTERN MONTGOMERY...SOUTH CENTRAL BUCKS AND NORTHERN
PHILADELPHIA COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4000 7466 3984 7481 3993 7499 3994 7498
      3994 7501 4007 7493 4008 7487 4009 7486
      4008 7481 4002 7465
TIME...MOT...LOC 0249Z 294DEG 30KT 3999 7488 

$$

NJC005-070300-
/O.CON.KPHI.SV.W.0140.000000T0000Z-210707T0300Z/
Burlington NJ-
1049 PM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR NORTHWESTERN BURLINGTON COUNTY...

At 1049 PM EDT, a severe thunderstorm was located over Willingboro,
or 12 miles east of Camden, moving southeast at 35 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...
Mount Laurel, Willingboro, Medford, Lumberton, Burlington, Mount
Holly, Beverly, Pemberton, Wrightstown, Ramblewood, Marlton,
Jacksonville, Jobstown, Cherry Hill Mall, Greentree, Maple Shade,
Edgewater Park, Medford Lakes, Moorestown-Lenola and Nws Office.

This includes the following highways...
 New Jersey Turnpike between exits 4 and 5.
 Interstate 295 in New Jersey between mile markers 36 and 50.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4000 7466 3984 7481 3993 7499 3994 7498
      3994 7501 4007 7493 4008 7487 4009 7486
      4008 7481 4002 7465
TIME...MOT...LOC 0249Z 294DEG 30KT 3999 7488 

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

MPS

291 
WWUS51 KPHI 070255
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1055 PM EDT Tue Jul 6 2021

NJC005-070305-
/O.EXP.KPHI.SV.W.0140.000000T0000Z-210707T0300Z/
Burlington NJ-
1055 PM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BURLINGTON COUNTY
WILL EXPIRE AT 1100 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.

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 4000 7466 3984 7481 3993 7499 3994 7498
      3994 7501 4007 7493 4008 7487 4009 7486
      4008 7481 4002 7465
TIME...MOT...LOC 0255Z 294DEG 30KT 3998 7486 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 8:16 PM EDT	Special Weather Statement	PHI	Lehigh	29 min
Jul 6, 8:29 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	46 min
Jul 6, 8:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	40 min
Jul 6, 9:04 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	41 min
Jul 6, 9:10 PM EDT	Areal Flood Advisory	PHI	Bucks	2 hr
Jul 6, 9:29 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	61 min
Jul 6, 9:48 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	57 min
Jul 6, 10:08 PM EDT	Special Weather Statement	PHI	Philadelphia	37 min
Jul 7, 3:32 PM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	42 hr
Jul 6, 8:03 PM EDT	Special Weather Statement	PHI	Burlington, Ocean	42 min
Jul 6, 8:11 PM EDT	Special Marine Warning	PHI		82 min
Jul 6, 8:24 PM EDT	Special Marine Warning	PHI		2 hr
Jul 6, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Monmouth, Morris, Somerset	53 min
Jul 6, 9:37 PM EDT	Special Marine Warning	PHI		113 min
Jul 6, 10:50 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	2 hr
Jul 6, 10:54 PM EDT	Special Weather Statement	PHI	Burlington	51 min
Jul 6, 11:11 PM EDT	Special Weather Statement	PHI	Burlington	19 min
Jul 6, 11:30 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Ocean	45 min
Jul 6, 11:39 PM EDT	Special Marine Warning	PHI		66 min
Jul 6, 11:55 PM EDT	Special Weather Statement	PHI	Monmouth	50 min
Jul 7, 12:01 AM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	71 min
Jul 7, 12:10 AM EDT	Special Marine Warning	PHI		95 min
Jul 7, 11:19 AM EDT	Tropical Storm Watch	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	18 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021 Severe Thunderstorm Warnings in New Jersey, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.