Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 137, NWS Philadelphia/Mount Holly

July 16, 2024New Castle County, Delaware; Mercer County, Salem County, New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 16, 2024, 8:23 PM EDT for New Castle County, Delaware; Mercer County, Salem County, New Jersey; 4 counties in Pennsylvania. It was in force for 67 min. 12 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 16, 2024, 8:23 PM EDT (00:23 UTC)
Expired: Jul 16, 2024, 9:30 PM EDT
In force: 67 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Mercer County, NJ, Salem County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 00:24 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 16, 8:35 PM EDT	TSTM WND DMG	Chadds Ford Twp, PA	Trees down. Time estimated from radar.
Jul 16, 8:40 PM EDT	TSTM WND DMG	1 W Glenside, PA	Several large tree limbs down and also a tree down blocking a roadway. Time estimated from radar.
Jul 16, 8:43 PM EDT	TSTM WND DMG	Glenside, PA	Video of large branches and limbs snapped off trees in Glenside PA. Time estimated.
Jul 16, 8:50 PM EDT	TSTM WND DMG	1 Wnw Elam, PA	Tree split on Ridge Road near Tally Ho Drive.
Jul 16, 8:55 PM EDT	TSTM WND DMG	1 Nw Bustleton, PA	Tree split on 1500 block of Creswood Rd.
Jul 16, 8:55 PM EDT	TSTM WND DMG	1 Wsw Bustleton, PA	Multiple trees and branches down along the 9200 block of Old Bustleton Avenue.
Jul 16, 8:55 PM EDT	TSTM WND DMG	Bustleton, PA	Tree on car on 1900 block of Welsh Road.
Jul 16, 8:59 PM EDT	TSTM WND DMG	2 Nnw Andalusia, PA	Several trees down along Woodhaven Road in Northeast Philadelphia. Time estimated by radar.
Jul 16, 8:59 PM EDT	TSTM WND GST 54	Northeast Philadelphia, PA	KPNE: Northeast Philadelphia Airport.
Jul 16, 9:06 PM EDT	TSTM WND GST 49	New Castle County Airpo, DE	KILG: New Castle County Airport.
Jul 16, 9:19 PM EDT	TSTM WND DMG	Wilmington, DE	* 2 INJ * Live local news coverage report of 2 people rushed to hospital after tree fell onto a home in Wilmington. Time estimated. Exact location not known.
Jul 16, 9:24 PM EDT	TSTM WND GST 41	Philadelphia Internatio, PA	KPHL: Philadelphia International Airport.

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 16, 3:36 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.4 hours before the alert went out and 225 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: 2487 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1346 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 9.7

Open this sounding in Storm Lab

The text

As transmitted.

706 
WUUS51 KPHI 170023
SVRPHI
DEC003-NJC021-033-PAC017-045-091-101-170130-
/O.NEW.KPHI.SV.W.0137.240717T0023Z-240717T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
823 PM EDT Tue Jul 16 2024

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern New Castle County in northern Delaware...
  Northwestern Salem County in southern New Jersey...
  Southwestern Mercer County in central New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Bucks County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 930 PM EDT.

* At 823 PM EDT, severe thunderstorms were located along a line
  extending from Lansdale to King Of Prussia to near West Grove,
  moving east at 30 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, Trenton, Camden, Wilmington, Newark, Bensalem, Ewing,
  Chester, Pennsville, Yeadon, Bristol, Carneys Point, Conshohocken,
  Hatboro, Folcroft, Ambler, Swarthmore, Elsmere, New Castle, and
  Penns Grove.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 332 and 358.
 Northeast Extension between mile markers 21 and 22.
 Interstate 95 in Pennsylvania between mile markers 0 and 40.
 Interstate 95 in Delaware between mile markers 0 and 23.
 Interstate 76 in Pennsylvania between mile markers 330 and 351.
 Interstate 195 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey near mile marker 0, and between mile
markers 59 and 64.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 3981 7570 3984 7560 3988 7559 3993 7554
      4004 7537 4027 7520 4024 7464 4017 7467
      4018 7471 4014 7474 4013 7482 4008 7487
      4007 7494 3996 7513 3988 7515 3985 7533
      3980 7541 3962 7556 3962 7579 3972 7579
TIME...MOT...LOC 0023Z 272DEG 28KT 4022 7530 4007 7537 3987 7584 

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

$$

Staarmann

3 follow-up statements

141 
WWUS51 KPHI 170029
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
829 PM EDT Tue Jul 16 2024

DEC003-NJC021-033-PAC017-045-091-101-170130-
/O.CON.KPHI.SV.W.0137.000000T0000Z-240717T0130Z/
New Castle DE-Salem NJ-Mercer NJ-Montgomery PA-Bucks PA-
Philadelphia PA-Delaware PA-
829 PM EDT Tue Jul 16 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR NORTHERN NEW CASTLE...NORTHWESTERN SALEM...SOUTHWESTERN MERCER...
SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS...PHILADELPHIA AND
DELAWARE COUNTIES...

At 828 PM EDT, severe thunderstorms were located along a line
extending from Norristown to Marshallton to near Homeville, moving 
east at 25 mph. These storms have a history of producing extensive 
damage to trees and power lines in Chester County.

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

SOURCE...Radar indicated. At 8:16 PM EDT, emergency management 
         reported numerous trees and wires down across western 
         Chester County.

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

Locations impacted include...
Philadelphia, Trenton, Camden, Wilmington, Newark, Bensalem, Ewing,
Chester, Pennsville, Yeadon, Bristol, Carneys Point, Conshohocken,
Hatboro, Folcroft, Ambler, Swarthmore, Elsmere, New Castle, and Penns
Grove.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 332 and 358.
 Northeast Extension between mile markers 21 and 22.
 Interstate 95 in Pennsylvania between mile markers 0 and 40.
 Interstate 95 in Delaware between mile markers 0 and 23.
 Interstate 76 in Pennsylvania between mile markers 330 and 351.
 Interstate 195 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey near mile marker 0, and between mile
markers 59 and 64.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 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 these storms.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3981 7570 3984 7560 3988 7559 3993 7554
      4004 7537 4027 7520 4024 7464 4017 7467
      4018 7471 4014 7474 4013 7482 4008 7487
      4007 7494 3996 7513 3988 7515 3985 7533
      3980 7541 3962 7556 3962 7579 3972 7579
TIME...MOT...LOC 0028Z 282DEG 21KT 4012 7533 3994 7571 3983 7594 

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

$$

Staarmann

830 
WWUS51 KPHI 170108
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
908 PM EDT Tue Jul 16 2024

DEC003-NJC021-033-PAC017-045-091-101-170130-
/O.CON.KPHI.SV.W.0137.000000T0000Z-240717T0130Z/
New Castle DE-Salem NJ-Mercer NJ-Montgomery PA-Bucks PA-
Philadelphia PA-Delaware PA-
908 PM EDT Tue Jul 16 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR NORTHERN NEW CASTLE...NORTHWESTERN SALEM...SOUTHWESTERN MERCER...
SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS...PHILADELPHIA AND
DELAWARE COUNTIES...

At 908 PM EDT, severe thunderstorms were located along a line
extending from Burlington to Paulsboro to near Elsmere, moving east
at 45 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, Trenton, Camden, Wilmington, Newark, Bensalem, Ewing,
Chester, Pennsville, Yeadon, Bristol, Carneys Point, Folcroft,
Swarthmore, Elsmere, New Castle, Penns Grove, Jenkintown, Narberth,
and National Park.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 344 and 358.
 Interstate 95 in Pennsylvania between mile markers 0 and 40.
 Interstate 95 in Delaware between mile markers 0 and 23.
 Interstate 76 in Pennsylvania between mile markers 334 and 351.
 Interstate 195 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey near mile marker 0, and between mile
markers 59 and 64.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 476 in Pennsylvania between mile markers 0 and 13.

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 these storms.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3981 7570 3984 7559 3988 7559 3993 7554
      4000 7543 4025 7493 4024 7464 4017 7467
      4018 7471 4014 7474 4013 7482 4008 7487
      4007 7494 3996 7513 3988 7515 3985 7533
      3981 7540 3962 7556 3962 7579 3972 7579
TIME...MOT...LOC 0108Z 291DEG 41KT 4006 7486 3984 7525 3975 7563 

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

$$

Staarmann

055 
WWUS51 KPHI 170128
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
928 PM EDT Tue Jul 16 2024

DEC003-NJC021-033-PAC017-045-091-101-170138-
/O.EXP.KPHI.SV.W.0137.000000T0000Z-240717T0130Z/
New Castle DE-Salem NJ-Mercer NJ-Montgomery PA-Bucks PA-
Philadelphia PA-Delaware PA-
928 PM EDT Tue Jul 16 2024

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE...
NORTHWESTERN SALEM...SOUTHWESTERN MERCER...SOUTHEASTERN MONTGOMERY...
SOUTHEASTERN BUCKS...PHILADELPHIA AND DELAWARE COUNTIES WILL EXPIRE
AT 930 PM EDT...

The storms which prompted the warning have moved out of the area 
into New Jersey and Delaware. Therefore, the warning will be allowed 
to expire.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northern Delaware...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 3981 7570 3984 7559 3988 7559 3993 7554
      4000 7543 4025 7493 4024 7464 4017 7467
      4018 7471 4014 7474 4013 7482 4008 7487
      4007 7494 3996 7513 3988 7515 3985 7533
      3981 7540 3962 7556 3962 7579 3972 7579
TIME...MOT...LOC 0128Z 272DEG 28KT 4006 7470 3984 7509 3975 7547 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 9:04 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	56 min
Jul 16, 10:17 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	58 min
Jul 16, 11:08 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle, Sussex	67 min
Jul 17, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	44 min
Jul 16, 8:13 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	62 min
Jul 16, 8:50 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Mercer, Monmouth and 1 more	55 min
Jul 16, 9:05 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, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	39 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 Severe Thunderstorm Warnings in Delaware, 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.