Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 237, NWS Philadelphia/Mount Holly

July 25, 20234 counties in Pennsylvania; 4 counties in New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 25, 2023, 3:58 PM EDT for 4 counties in Pennsylvania; 4 counties in New Jersey; New Castle County, Delaware. It was in force for 30 min. 1 report 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 25, 2023, 3:58 PM EDT (19:58 UTC)
Expired: Jul 25, 2023, 4:28 PM EDT
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 79 km from the middle of the area, began a volume at 20:00 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 25, 4:30 PM EDT	TSTM WND GST 39	1 Ssw Palmyra, NJ	Pennsauken NJ Mesonet station gusted to 39mph.

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 25, 12:13 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.0 hours before the alert went out and 209 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: 591 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1068 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

861 
WUUS51 KPHI 251958
SVRPHI
DEC003-NJC005-007-015-033-PAC029-045-091-101-252045-
/O.NEW.KPHI.SV.W.0237.230725T1958Z-230725T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
358 PM EDT Tue Jul 25 2023

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...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Central Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 445 PM EDT.

* At 358 PM EDT, severe thunderstorms were located along a line
  extending from Ambler to near Newtown Square to near Kennett
  Square, moving southeast at 10 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, Wilmington, West Chester, Gloucester City,
  Norristown, Chester, West Deptford, West Norriton, East Norriton,
  Yeadon, Westtown, Woodbury, Riverside, Carneys Point, Conshohocken,
  Palmyra, Folcroft, Ambler and Swarthmore.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 322 and 341.
 Northeast Extension between mile markers 21 and 24.
 Interstate 95 in Pennsylvania between mile markers 0 and 33.
 Interstate 95 in Delaware between mile markers 8 and 23.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.
 Interstate 76 in New Jersey between mile markers 2 and 3.
 Interstate 295 in New Jersey between mile markers 9 and 24.
 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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4003 7494 3978 7524 3968 7565 3991 7588
      4007 7550 4022 7524
TIME...MOT...LOC 1958Z 312DEG 9KT 4014 7519 3996 7543 3985 7575 

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

$$

Fitzsimmons

1 follow-up statement

144 
WWUS51 KPHI 252028
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
428 PM EDT Tue Jul 25 2023

DEC003-NJC005-007-015-033-PAC029-045-091-101-252038-
/O.CAN.KPHI.SV.W.0237.000000T0000Z-230725T2045Z/
New Castle DE-Salem NJ-Camden NJ-Gloucester NJ-Burlington NJ-
Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
428 PM EDT Tue Jul 25 2023

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE...
NORTHWESTERN SALEM...NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...
NORTHWESTERN BURLINGTON...SOUTHEASTERN MONTGOMERY...CENTRAL
CHESTER...PHILADELPHIA AND DELAWARE COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with these thunderstorms.

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

LAT...LON 4003 7494 3978 7524 3968 7565 3991 7588
      4007 7550 4022 7524
TIME...MOT...LOC 2027Z 312DEG 9KT 4009 7512 3991 7536 3980 7568 

$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 11:58 AM EDT	Special Weather Statement	PHI	Montgomery	32 min
Jul 25, 12:07 PM EDT	Special Weather Statement	PHI	Berks	23 min
Jul 25, 12:16 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Montgomery	44 min
Jul 25, 12:31 PM EDT	Special Weather Statement	PHI	Berks	29 min
Jul 25, 12:33 PM EDT	Special Weather Statement	PHI	Berks	27 min
Jul 25, 12:37 PM EDT	Special Weather Statement	PHI	Carbon	38 min
Jul 25, 12:47 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	33 min
Jul 25, 12:56 PM EDT	Special Weather Statement	PHI	Northampton	34 min
Jul 25, 1:00 PM EDT	Special Weather Statement	PHI	Berks	30 min
Jul 25, 1:03 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	42 min
Jul 25, 1:06 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	39 min
Jul 25, 1:10 PM EDT	Special Weather Statement	PHI	Delaware	35 min
Jul 25, 1:12 PM EDT	Special Weather Statement	PHI	Monroe	33 min
Jul 25, 1:20 PM EDT	Flash Flood Warning	PHI	Bucks, Montgomery	5 hr
Jul 25, 1:27 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Jul 25, 1:27 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	48 min
Jul 25, 1:37 PM EDT	Areal Flood Advisory	PHI	Carbon	3 hr
Jul 25, 1:38 PM EDT	Flash Flood Warning	PHI	Delaware	4 hr
Jul 25, 1:41 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	3 hr
Jul 25, 1:42 PM EDT	Special Weather Statement	PHI	Philadelphia	33 min
Jul 25, 1:49 PM EDT	Special Weather Statement	PHI	Chester	26 min
Jul 25, 1:54 PM EDT	Flash Flood Warning	PHI	Delaware, Philadelphia	4 hr
Jul 25, 1:55 PM EDT	Areal Flood Advisory	PHI	Monroe	2 hr
Jul 25, 2:06 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	39 min
Jul 25, 2:14 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	46 min
Jul 25, 2:21 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	2 hr
Jul 25, 2:36 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery, Philadelphia	39 min
Jul 25, 2:51 PM EDT	Flash Flood Warning	PHI	Chester, Montgomery	3 hr
Jul 25, 2:57 PM EDT	Areal Flood Advisory	PHI	Chester	3 hr
Jul 25, 3:06 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	95 min
Jul 25, 3:13 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jul 25, 3:16 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	44 min
Jul 25, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	39 min
Jul 25, 3:34 PM EDT	Flash Flood Warning	PHI	Chester, Montgomery	3 hr
Jul 25, 4:04 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jul 25, 4:55 PM EDT	Flash Flood Warning	PHI	Chester	118 min
Jul 25, 5:07 PM EDT	River Flood Warning	PHI	Chester	6 hr
Jul 25, 1:21 PM EDT	Special Weather Statement	PHI	Hunterdon	24 min
Jul 25, 1:52 PM EDT	Special Marine Warning	PHI		38 min
Jul 25, 2:08 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	52 min
Jul 25, 2:20 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	55 min
Jul 25, 2:39 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset, Sussex	51 min
Jul 25, 2:44 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	2 hr
Jul 25, 2:45 PM EDT	Special Marine Warning	PHI		60 min
Jul 25, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Somerset	52 min
Jul 25, 3:24 PM EDT	Special Marine Warning	PHI		96 min
Jul 25, 3:27 PM EDT	Areal Flood Advisory	PHI	Middlesex, Somerset	81 min
Jul 25, 3:40 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	50 min
Jul 25, 3:45 PM EDT	Special Marine Warning	PHI		60 min
Jul 25, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	53 min
Jul 25, 3:57 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	3 hr
Jul 25, 4:12 PM EDT	Flash Flood Warning	PHI	Monmouth	3 hr
Jul 25, 4:17 PM EDT	Special Marine Warning	PHI		58 min
Jul 25, 4:50 PM EDT	Special Marine Warning	PHI		55 min
Jul 25, 4:57 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	2 hr
Jul 25, 5:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 25, 12:26 PM EDT	Special Weather Statement	PHI	Kent	34 min
Jul 25, 12:52 PM EDT	Special Weather Statement	PHI	New Castle	23 min
Jul 25, 1:34 PM EDT	Special Weather Statement	PHI	Kent	26 min
Jul 25, 2:51 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	39 min
Jul 25, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	39 min
Jul 25, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	44 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2023 Severe Thunderstorm Warnings in New Jersey, 2023 Severe Thunderstorm Warnings in Delaware, 2023 Every severe thunderstorm warning in 2023

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.