Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 177, NWS Philadelphia/Mount Holly

August 3, 2024New Castle County, Delaware; Chester County, Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 3, 2024, 5:38 PM EDT for New Castle County, Delaware; Chester County, Delaware County, Pennsylvania. It was in force for 97 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: Aug 3, 2024, 5:38 PM EDT (21:38 UTC)
Expired: Aug 3, 2024, 7:15 PM EDT
In force: 97 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.0 in
Wind: 70.0 mph

Counties New Castle County, DE, Chester County, PA, Delaware County, PA

The radar

The Dover AFB radar (KDOX), 111 km from the middle of the area, began a volume at 21:38 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
Aug 3, 5:55 PM EDT	TSTM WND DMG	Caln Twp, PA	Multiple calls for trees and wires down in Caln. Time estimated from radar.
Aug 3, 6:04 PM EDT	TSTM WND DMG	Hockessin, DE	Trees and wires down around Hockessin. Time estimated from radar.
Aug 3, 6:09 PM EDT	TSTM WND DMG	Talleyville, DE	Trees and wires down around Talleyville. Time estimated from radar.
Aug 3, 6:10 PM EDT	MARINE TSTM WIND 43	1 Ssw New Castle, DE	Wilmington ASOS gusted to 37 kt.
Aug 3, 6:22 PM EDT	TSTM WND DMG	Claymont, DE	Trees and wires down around Claymont. 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
Aug 3, 1:20 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.6 hours before the alert went out and 174 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: 318 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 9 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.

211 
WUUS51 KPHI 032138
SVRPHI
DEC003-PAC029-045-032315-
/O.NEW.KPHI.SV.W.0177.240803T2138Z-240803T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
538 PM EDT Sat Aug 3 2024

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  New Castle County in northern Delaware...
  Chester County in southeastern Pennsylvania...
  Western Delaware County in southeastern Pennsylvania...

* Until 715 PM EDT.

* At 537 PM EDT, severe thunderstorms were located along a line
  extending from near Quarryville to 6 miles southeast of Delta to
  Perryman, moving east at 30 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Wilmington, Newark, Middletown, West Chester, Chester, Coatesville,
  Westtown, Carneys Point, Downingtown, Elsmere, Kennett Square, New
  Castle, Oxford, Parkesburg, West Grove, Delaware City, Newport,
  Arden, Glen Roy, and Stanton.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 314 and 325.
 Interstate 95 in Pennsylvania between mile markers 0 and 3.
 Interstate 95 in Delaware between mile markers 1 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

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 3976 7606 3983 7604 3987 7599 3995 7600
      4000 7596 4010 7546 4009 7545 4009 7542
      4006 7539 4007 7536 3981 7540 3963 7558
      3956 7555 3948 7556 3939 7550 3939 7577
      3972 7579 3972 7613
TIME...MOT...LOC 2137Z 257DEG 26KT 3985 7615 3965 7627 3944 7624 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

5 follow-up statements

644 
WWUS51 KPHI 032208
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
608 PM EDT Sat Aug 3 2024

DEC003-PAC029-045-032315-
/O.CON.KPHI.SV.W.0177.000000T0000Z-240803T2315Z/
New Castle DE-Chester PA-Delaware PA-
608 PM EDT Sat Aug 3 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NEW CASTLE...CHESTER AND WESTERN DELAWARE COUNTIES...

At 607 PM EDT, severe thunderstorms were located along a line
extending from near Kennett Square to Calvert to near Hollywood 
Beach, moving east at 30 mph. This line of storms has a history of 
producing wind damage in northeastern Maryland.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Wilmington, Newark, Middletown, West Chester, Chester, Coatesville,
Westtown, Carneys Point, Downingtown, Elsmere, Kennett Square, New
Castle, Oxford, Parkesburg, West Grove, Delaware City, Newport,
Arden, Glen Roy, and Stanton.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 314 and 325.
 Interstate 95 in Pennsylvania between mile markers 0 and 3.
 Interstate 95 in Delaware between mile markers 1 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

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 3976 7606 3983 7604 3987 7599 3995 7600
      4000 7596 4010 7546 4009 7545 4009 7542
      4006 7539 4007 7536 3981 7540 3963 7558
      3956 7555 3948 7556 3939 7550 3939 7577
      3972 7579 3972 7613
TIME...MOT...LOC 2207Z 256DEG 27KT 3988 7575 3970 7598 3949 7600 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

720 
WWUS51 KPHI 032232
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
632 PM EDT Sat Aug 3 2024

DEC003-PAC029-045-032315-
/O.CON.KPHI.SV.W.0177.000000T0000Z-240803T2315Z/
New Castle DE-Chester PA-Delaware PA-
632 PM EDT Sat Aug 3 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NEW CASTLE...SOUTHEASTERN CHESTER AND WESTERN DELAWARE
COUNTIES...

At 632 PM EDT, severe thunderstorms were located along a line
extending from Chester to near Stanton to Cayots, moving east at 55 
mph. This storm has a history of producing wind damage across 
northeastern Maryland.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Wilmington, Newark, Middletown, West Chester, Chester, Westtown,
Carneys Point, Elsmere, New Castle, Delaware City, Newport, Arden,
Stanton, Cheyney, Glasgow, Talleyville, Elam, Chelsea, Radnor
Township, and Saint Georges.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 314 and 325.
 Interstate 95 in Pennsylvania between mile markers 0 and 3.
 Interstate 95 in Delaware between mile markers 1 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

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 3985 7564 3993 7568 4006 7567 4010 7546
      4009 7542 4006 7539 4007 7536 3981 7540
      3963 7558 3956 7555 3948 7556 3939 7550
      3939 7577 3972 7579 3972 7587
TIME...MOT...LOC 2232Z 278DEG 47KT 3987 7535 3967 7565 3949 7582 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

223 
WWUS51 KPHI 032242
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
642 PM EDT Sat Aug 3 2024

PAC029-032251-
/O.CAN.KPHI.SV.W.0177.000000T0000Z-240803T2315Z/
Chester PA-
642 PM EDT Sat Aug 3 2024

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHESTER COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.

LAT...LON 3985 7546 3999 7537 3981 7540 3977 7546
      3974 7547 3963 7558 3956 7555 3948 7556
      3939 7550 3939 7577 3972 7579
TIME...MOT...LOC 2241Z 256DEG 26KT 3987 7524 3968 7561 3950 7576 

$$

DEC003-PAC045-032315-
/O.CON.KPHI.SV.W.0177.000000T0000Z-240803T2315Z/
New Castle DE-Delaware PA-
642 PM EDT Sat Aug 3 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NEW CASTLE AND SOUTH CENTRAL DELAWARE COUNTIES...

At 641 PM EDT, severe thunderstorms were located along a line
extending from Philadelphia International Airport to Wilmington Manor
to near Bohemias Mills, moving east at 30 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Wilmington, Newark, Middletown, Chester, Elsmere, New Castle,
Delaware City, Newport, Arden, Stanton, Glasgow, Bear, Talleyville,
Port Penn, Wilmington Manor, Pike Creek, Saint Georges, Greenville,
Mount Pleasant, and Chester Township.

This includes the following highways...
 Interstate 95 in Pennsylvania between mile markers 0 and 3.
 Interstate 95 in Delaware between mile markers 1 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

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

&&

LAT...LON 3985 7546 3999 7537 3981 7540 3977 7546
      3974 7547 3963 7558 3956 7555 3948 7556
      3939 7550 3939 7577 3972 7579
TIME...MOT...LOC 2241Z 256DEG 26KT 3987 7524 3968 7561 3950 7576 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

109 
WWUS51 KPHI 032259
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
659 PM EDT Sat Aug 3 2024

PAC045-032308-
/O.CAN.KPHI.SV.W.0177.000000T0000Z-240803T2315Z/
Delaware PA-
659 PM EDT Sat Aug 3 2024

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL DELAWARE COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.

LAT...LON 3982 7545 3982 7544 3980 7542 3977 7546
      3974 7547 3963 7558 3956 7555 3948 7556
      3939 7550 3939 7577 3972 7579
TIME...MOT...LOC 2258Z 256DEG 26KT 3985 7495 3970 7548 3952 7563 

$$

DEC003-032315-
/O.CON.KPHI.SV.W.0177.000000T0000Z-240803T2315Z/
New Castle DE-
659 PM EDT Sat Aug 3 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NEW CASTLE COUNTY...

At 658 PM EDT, severe thunderstorms were located along a line
extending from Voorhees to Carneys Point to near Saint Georges,
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...
Wilmington, Newark, Middletown, Elsmere, New Castle, Delaware City,
Newport, Arden, Stanton, Glasgow, Bear, Port Penn, Wilmington Manor,
Pike Creek, Saint Georges, Mount Pleasant, Greenville, North Star,
Marcus Hook, and Townsend.

This includes the following highways...
 Interstate 95 in Pennsylvania near mile marker 0.
 Interstate 95 in Delaware between mile markers 1 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

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 3982 7545 3982 7544 3980 7542 3977 7546
      3974 7547 3963 7558 3956 7555 3948 7556
      3939 7550 3939 7577 3972 7579
TIME...MOT...LOC 2258Z 256DEG 26KT 3985 7495 3970 7548 3952 7563 

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

$$

Staarmann

271 
WWUS51 KPHI 032306
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
706 PM EDT Sat Aug 3 2024

DEC003-032316-
/O.EXP.KPHI.SV.W.0177.000000T0000Z-240803T2315Z/
New Castle DE-
706 PM EDT Sat Aug 3 2024

...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE COUNTY WILL EXPIRE
AT 715 PM EDT...

The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds and heavy rain are still
possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern Delaware...southern 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 3982 7545 3982 7544 3980 7542 3977 7546
      3974 7547 3963 7558 3956 7555 3948 7556
      3939 7550 3939 7577 3972 7579
TIME...MOT...LOC 2306Z 257DEG 26KT 3986 7489 3971 7542 3953 7557 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 9:12 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	48 min
Aug 2, 9:40 PM EDT	Flash Flood Warning	PHI	New Castle	4 hr
Aug 3, 3:17 AM EDT	Heat Advisory	PHI	New Castle	17 hr
Aug 3, 12:20 PM EDT	Flood Watch	PHI	New Castle	9 hr
Aug 3, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	60 min
Aug 3, 2:40 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	65 min
Aug 3, 2:53 PM EDT	Flash Flood Warning	PHI	Carbon	117 min
Aug 3, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	45 min
Aug 3, 4:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	47 min
Aug 3, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	59 min
Aug 3, 6:49 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	56 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 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.