Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 147, NWS Philadelphia/Mount Holly

July 17, 2024Burlington County, Camden County, Gloucester County, New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2024, 3:05 PM EDT for Burlington County, Camden County, Gloucester County, New Jersey; 5 counties in Pennsylvania. It was in force for 39 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: Jul 17, 2024, 3:05 PM EDT (19:05 UTC)
Expired: Jul 17, 2024, 3:44 PM EDT
In force: 39 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, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 83 km from the middle of the area, began a volume at 19:07 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 17, 3:11 PM EDT	TSTM WND DMG	1 Wnw Chesterbrook, PA	Received photos of a large tree that fell down on backyard deck with multiple other trees down on roads. Time estimated.
Jul 17, 3:14 PM EDT	TSTM WND DMG	1 Ne Valley Forge, PA	Delayed report from last week. NWS employee relayed photos of several large trees uprooted and snapped on a trail in Valley Forge National Historical Park. Other tree damage in the area as well. Time estimated.
Jul 17, 3:15 PM EDT	TSTM WND DMG	Trooper, PA	Large tree split off about half way up and blocking the roadway. This occurred at South Midland and Oakdale Avenues in Lower Providence Township. 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.

Issued	Product	Office	Lasted
Jul 17, 12:58 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.1 hours before the alert went out and 214 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: 88 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 1518 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

716 
WUUS51 KPHI 171905
SVRPHI
NJC005-007-015-PAC017-029-045-091-101-172000-
/O.NEW.KPHI.SV.W.0147.240717T1905Z-240717T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
305 PM EDT Wed Jul 17 2024

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Camden County in southern New Jersey...
  North central Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southern Montgomery County in southeastern Pennsylvania...
  South central Bucks County in southeastern Pennsylvania...
  Northeastern Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 400 PM EDT.

* At 305 PM EDT, a severe thunderstorm was located near Paoli, or 8
  miles northeast of West Chester, moving east at 35 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, West Chester, Gloucester City, Cherry Hill,
  Bensalem, Evesham, Mount Laurel, Norristown, Chester, Voorhees,
  Lindenwold, Phoenixville, Lansdale, West Norriton, East Norriton,
  Bellmawr, Yeadon, Westtown, and Woodbury.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Pennsylvania Turnpike between mile markers 311 and 354.
 Northeast Extension between mile markers 21 and 30.
 Interstate 95 in Pennsylvania between mile markers 6 and 38.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 21 and 41.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 4018 7571 4033 7492 3981 7488 3988 7565
TIME...MOT...LOC 1905Z 264DEG 30KT 4008 7553 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

3 follow-up statements

841 
WWUS51 KPHI 171922
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
322 PM EDT Wed Jul 17 2024

NJC005-007-015-PAC017-029-045-091-101-172000-
/O.CON.KPHI.SV.W.0147.000000T0000Z-240717T2000Z/
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Bucks PA-
Chester PA-Philadelphia PA-Delaware PA-
322 PM EDT Wed Jul 17 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR NORTHWESTERN CAMDEN...NORTH CENTRAL GLOUCESTER...NORTHWESTERN
BURLINGTON...SOUTHERN MONTGOMERY...SOUTH CENTRAL BUCKS...NORTHEASTERN
CHESTER...PHILADELPHIA AND DELAWARE COUNTIES...

At 321 PM EDT, a severe thunderstorm was located over King Of
Prussia, or 12 miles northwest of Philadelphia, moving east at 35 
mph. This storm has a history of producing wind damage in Chester 
County.

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

SOURCE...Trained weather spotters.

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

Locations impacted include...
Philadelphia, Camden, West Chester, Gloucester City, Cherry Hill,
Bensalem, Evesham, Mount Laurel, Norristown, Chester, Voorhees,
Lindenwold, Phoenixville, Lansdale, West Norriton, East Norriton,
Bellmawr, Yeadon, Westtown, and Woodbury.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Pennsylvania Turnpike between mile markers 313 and 354.
 Northeast Extension between mile markers 21 and 30.
 Interstate 95 in Pennsylvania between mile markers 6 and 38.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 21 and 41.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

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

&&

LAT...LON 4003 7568 4021 7557 4033 7492 3981 7488
      3988 7565
TIME...MOT...LOC 1921Z 264DEG 30KT 4009 7535 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

Staarmann

977 
WWUS51 KPHI 171935
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
335 PM EDT Wed Jul 17 2024

NJC005-007-015-PAC017-029-045-091-101-172000-
/O.CON.KPHI.SV.W.0147.000000T0000Z-240717T2000Z/
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Bucks PA-
Chester PA-Philadelphia PA-Delaware PA-
335 PM EDT Wed Jul 17 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR NORTHWESTERN CAMDEN...NORTH CENTRAL GLOUCESTER...NORTHWESTERN
BURLINGTON...SOUTHEASTERN MONTGOMERY...SOUTH CENTRAL BUCKS...EAST
CENTRAL CHESTER...PHILADELPHIA AND DELAWARE COUNTIES...

At 335 PM EDT, a severe thunderstorm was located over Chestnut Hill,
or near Philadelphia, moving east at 35 mph.

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

SOURCE...Trained weather spotters.

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, Bensalem,
Evesham, Mount Laurel, Norristown, Chester, Voorhees, Lindenwold,
Lansdale, West Norriton, East Norriton, Bellmawr, Yeadon, Woodbury,
Riverside, Conshohocken, and Palmyra.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Pennsylvania Turnpike between mile markers 320 and 354.
 Northeast Extension between mile markers 21 and 29.
 Interstate 95 in Pennsylvania between mile markers 6 and 38.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 22 and 41.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4007 7555 4022 7540 4033 7492 3981 7488
      3986 7541
TIME...MOT...LOC 1935Z 264DEG 29KT 4008 7522 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

Staarmann

982 
WWUS51 KPHI 171944
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
344 PM EDT Wed Jul 17 2024

NJC005-007-015-PAC017-029-045-091-101-171954-
/O.CAN.KPHI.SV.W.0147.000000T0000Z-240717T2000Z/
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Bucks PA-
Chester PA-Philadelphia PA-Delaware PA-
344 PM EDT Wed Jul 17 2024

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...NORTH
CENTRAL GLOUCESTER...NORTHWESTERN BURLINGTON...SOUTHEASTERN
MONTGOMERY...SOUTH CENTRAL BUCKS...EAST CENTRAL CHESTER...
PHILADELPHIA AND DELAWARE 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 are 
still possible with this thunderstorm.

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

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 4007 7555 4022 7540 4033 7492 3981 7488
      3986 7541
TIME...MOT...LOC 1943Z 264DEG 30KT 4009 7512 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 8:13 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	62 min
Jul 16, 8:23 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Salem	67 min
Jul 16, 8:50 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Mercer, Monmouth and 1 more	55 min
Jul 16, 9:04 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	56 min
Jul 16, 9:05 PM EDT	Special Marine Warning	PHI		115 min
Jul 16, 9:07 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Somerset	68 min
Jul 16, 9:10 PM EDT	Special Marine Warning	PHI		2 hr
Jul 16, 9:49 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more	71 min
Jul 16, 9:53 PM EDT	Special Marine Warning	PHI		2 hr
Jul 16, 10:50 PM EDT	Special Marine Warning	PHI		115 min
Jul 16, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland, Gloucester, Salem	62 min
Jul 17, 12:00 AM EDT	Special Marine Warning	PHI		90 min
Jul 17, 1:28 AM EDT	Special Marine Warning	PHI		62 min
Jul 17, 3:04 AM EDT	Small Craft Advisory	PHI		33 hr
Jul 17, 2:25 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	65 min
Jul 17, 3:13 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	62 min
Jul 17, 6:40 PM EDT	Severe Thunderstorm Warning	PHI	Warren	65 min
Jul 17, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	54 min
Jul 17, 7:18 PM EDT	Flash Flood Warning	PHI	Sussex, Warren	2 hr
Jul 16, 8:05 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	70 min
Jul 17, 2:16 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	59 min
Jul 17, 5:51 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	54 min
Jul 17, 6:18 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe	57 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2024 Severe Thunderstorm Warnings in New Jersey, 2024 Every severe thunderstorm warning in 2024

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.