Alert archive / New Jersey / Flash Flood Warnings in 2026

Flash Flood Warning 79, NWS Philadelphia/Mount Holly

July 28, 2026New Castle County, Delaware; Delaware County, Philadelphia County, Pennsylvania; Camden County, Gloucester County, Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 28, 2026, 7:11 PM EDT for New Castle County, Delaware; Delaware County, Philadelphia County, Pennsylvania; Camden County, Gloucester County, Salem County, New Jersey. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 28, 2026, 7:11 PM EDT (23:11 UTC)
Expired
Jul 28, 2026, 10:33 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

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

The radar

The Philadelphia radar (KDIX), 92 km from the middle of the area, began a volume at 23:14 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.2 hours before the alert went out and 192 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2026-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 710 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2026-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
710 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
968 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted.

405 
WGUS51 KPHI 282311
FFWPHI
DEC003-NJC007-015-033-PAC045-101-290315-
/O.NEW.KPHI.FF.W.0079.260728T2311Z-260729T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
711 PM EDT Tue Jul 28 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northeastern New Castle County in northern Delaware...
  West Central Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northwestern Salem County in southern New Jersey...
  Southern Delaware County in southeastern Pennsylvania...
  Southwestern Philadelphia County in southeastern Pennsylvania...

* Until 1115 PM EDT.

* At 711 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 1 inch of rain has 
  fallen. The expected rainfall rate is 1.5 to 2.5 inches in 1 hour. 
  Additional rainfall amounts of 0.5 to 1.5 inches are possible in 
  the warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets, and underpasses as well as other
           drainage and low lying areas.

* Some locations that may experience flash flooding include...
  Philadelphia, Camden, Wilmington, Gloucester City, Chester, 
  Deptford, West Deptford, Pennsville, Bellmawr, Yeadon, Woodbury 
  and Carneys Point.

This includes the following highways...
	Interstate 295 in New Jersey between mile markers 0 and 27.
	Interstate 476 in Pennsylvania between mile markers 0 and 7.
	New Jersey Turnpike near exit 2.
	Interstate 76 in Pennsylvania between mile markers 341 and 351.
	Interstate 95 in Pennsylvania between mile markers 0 and 19.
	Interstate 676 in Pennsylvania between mile markers 0 and 1.
	Interstate 76 in New Jersey near mile marker 0...and
	near mile marker 3.
	Interstate 95 in Delaware between mile markers 9 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 3983 7563 3984 7560 3985 7559 4001 7521
      3985 7508 3967 7542 3965 7563

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR

$$

AKL
2 follow-up statements
896 
WGUS71 KPHI 290120
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
920 PM EDT Tue Jul 28 2026

NJC007-PAC101-290130-
/O.CAN.KPHI.FF.W.0079.000000T0000Z-260729T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Philadelphia PA-
920 PM EDT Tue Jul 28 2026

...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL CAMDEN AND 
SOUTHWESTERN PHILADELPHIA COUNTIES...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

A Flood Watch remains in effect until 200 PM EDT Wednesday for 
portions of northern Delaware, New Jersey, and Pennsylvania.

&&

LAT...LON 3983 7563 3983 7561 3984 7560 3989 7540
      3976 7526 3967 7542 3965 7563

$$

DEC003-NJC015-033-PAC045-290315-
/O.CON.KPHI.FF.W.0079.000000T0000Z-260729T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Gloucester NJ-Salem NJ-Delaware PA-
920 PM EDT Tue Jul 28 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT THIS 
EVENING FOR NORTHEASTERN NEW CASTLE, NORTHWESTERN GLOUCESTER, 
NORTHWESTERN SALEM AND SOUTHWESTERN DELAWARE COUNTIES...

At 920 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen. Additional rainfall amounts up to 0.5 inches are possible in 
the warned area. Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets, and underpasses as well as other
         drainage and low lying areas.

Some locations that may experience flash flooding include...
  Wilmington, Chester, Pennsville, Carneys Point, Elsmere, New 
  Castle, Penns Grove, Swedesboro, Newport, Arden, Delaware Memorial 
  Bridge and Talleyville.

This includes the following highways...
	Interstate 295 in New Jersey between mile markers 0 and 14.
	New Jersey Turnpike near exit 2.
	Interstate 95 in Pennsylvania between mile markers 0 and 5.
	Interstate 95 in Delaware between mile markers 9 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3983 7563 3983 7561 3984 7560 3989 7540
      3976 7526 3967 7542 3965 7563

FLASH FLOOD...RADAR INDICATED

$$

AKL
866 
WGUS71 KPHI 290233
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1033 PM EDT Tue Jul 28 2026

DEC003-NJC015-033-PAC045-290243-
/O.CAN.KPHI.FF.W.0079.000000T0000Z-260729T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Gloucester NJ-Salem NJ-Delaware PA-
1033 PM EDT Tue Jul 28 2026

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN NEW CASTLE, 
NORTHWESTERN GLOUCESTER, NORTHWESTERN SALEM AND SOUTHWESTERN 
DELAWARE COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 200 PM EDT Wednesday for 
portions of northern Delaware, New Jersey, and Pennsylvania.

&&

LAT...LON 3983 7563 3983 7561 3984 7560 3989 7540
      3976 7526 3967 7542 3965 7563

$$

AKL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 5:29 PM EDTSevere Thunderstorm WarningPHINew Castle61 min
Jul 28, 5:53 PM EDTSevere Thunderstorm WarningPHIKent52 min
Jul 28, 6:08 PM EDTSevere Thunderstorm WarningPHIKent, New Castle52 min
Jul 28, 6:16 PM EDTTornado WarningPHINew Castle29 min
Jul 28, 6:23 PM EDTSevere Thunderstorm WarningPHINew Castle67 min
Jul 28, 6:38 PM EDTSevere Thunderstorm Warning Considerable damage threatPHIKent, New Castle67 min
Jul 28, 6:46 PM EDTTornado WarningPHINew Castle29 min
Jul 28, 6:55 PM EDTSevere Thunderstorm WarningPHIKent50 min
Jul 28, 6:59 PM EDTSevere Thunderstorm WarningPHIKent, Sussex61 min
Jul 28, 7:40 PM EDTSevere Thunderstorm WarningPHISussex50 min
Jul 27, 8:01 PM EDTSevere Thunderstorm WarningPHIChester23 min
Jul 28, 1:02 PM EDTFlash Flood WarningPHILehigh, Monroe, Northampton4 hr
Jul 28, 1:22 PM EDTSevere Thunderstorm WarningPHILehigh, Northampton38 min
Jul 28, 1:31 PM EDTSevere Thunderstorm WarningPHINorthampton44 min
Jul 28, 1:49 PM EDTTornado WarningPHIMonroe, Northampton26 min
Jul 28, 2:15 PM EDTSevere Thunderstorm WarningPHINorthampton45 min
Jul 28, 5:08 PM EDTSevere Thunderstorm WarningPHILehigh, Northampton15 min
Jul 28, 5:22 PM EDTSevere Thunderstorm WarningPHIBucks34 min
Jul 28, 5:47 PM EDTSevere Thunderstorm WarningPHIBucks, Northampton43 min
Jul 28, 5:55 PM EDTFlash Flood WarningPHIBerks3 hr
Jul 28, 6:17 PM EDTFlash Flood WarningPHIBucks, Lehigh, Northampton6 hr
Jul 28, 6:56 PM EDTFlash Flood WarningPHIBucks, Lehigh, Northampton5 hr
Jul 28, 7:06 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia54 min
Jul 28, 7:08 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery35 min
Jul 28, 7:24 PM EDTFlash Flood WarningPHIChester4 hr
Jul 28, 7:31 PM EDTSevere Thunderstorm WarningPHIBucks, Northampton44 min
Jul 28, 7:55 PM EDTFlash Flood WarningPHIBucks, Montgomery4 hr
Jul 28, 2:04 PM EDTFlash Flood WarningPHIWarren10 hr
Jul 28, 2:11 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Somerset4 hr
Jul 28, 2:45 PM EDTFlash Flood WarningPHIHunterdon, Morris, Warren9 hr
Jul 28, 2:56 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Sussex49 min
Jul 28, 3:04 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth41 min
Jul 28, 3:43 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Sussex, Warren23 min
Jul 28, 4:02 PM EDTFlash Flood WarningPHIMiddlesex2 hr
Jul 28, 6:10 PM EDTSpecial Marine WarningPHI2 hr
Jul 28, 6:16 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset25 min
Jul 28, 7:23 PM EDTSpecial Marine WarningPHI2 hr
Jul 28, 7:37 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland, Salem23 min

Nearby

Flash Flood Warnings in New Jersey, 2026Flash Flood Warnings in Pennsylvania, 2026Flash Flood Warnings in Delaware, 2026Every flash flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.