Alert archive / New Jersey / Flash Flood Warnings in 2026

Flash Flood Warning 92, NWS Philadelphia/Mount Holly

August 3, 2026New Castle County, Delaware; 5 counties in New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 3, 2026, 9:08 AM EDT for New Castle County, Delaware; 5 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 3 hr. 10 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, 2026, 9:08 AM EDT (13:08 UTC)
Expired
Aug 3, 2026, 12:01 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

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

The radar

The Philadelphia radar (KDIX), 69 km from the middle of the area, began a volume at 13:09 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

TimeReportWhereRemark
Aug 3, 9:31 AM EDTFLASH FLOODCinnaminson, NJRoute 130 North at the intersection of Meetinghouse Road is flooded. Time from report.
Aug 3, 9:33 AM EDTFLASH FLOOD1 E Parkside, NJNJ DOT: Flooding on US 130 Southbound At US 30 (Pennsauken Twp), All lanes closed.
Aug 3, 9:47 AM EDTFLASH FLOOD1 Ssw Riverside, NJRoad flooding at the intersection of 5th Street and Ithaca Ave. Time from report.
Aug 3, 9:59 AM EDTFLASH FLOODFairview, NJNJ DOT: Flooding on I-676 Northbound At Exit 1 - Collings Ave (Camden), 1 left lane of 3 lanes closed.
Aug 3, 10:00 AM EDTFLASH FLOODMount Airy, PAMinor street flooding was reported along Mt Pleasant Avenue. Time estimated from radar.
Aug 3, 10:01 AM EDTFLASH FLOODLenola, NJRoute 73 South has a right lane closure due to flooding on the road near the intersection of Morris Ave. Time from report.
Aug 3, 10:12 AM EDTFLASH FLOOD1 Nw Cherry Hill Twp, NJNJ DOT: Flooding on NJ 38 Both Directions East of CR 625/Longwood Av (Cherry Hill Twp), All lanes closed eastbound; All lanes closed westbound.
Aug 3, 10:30 AM EDTRAIN 3.611 Sse Fairview, NJRainfall total as of 10:30 AM with rain still falling at the time of the report.
Aug 3, 11:05 AM EDTRAIN 3.831 Sse Fairview, NJUpdates previous rain report. Rainfall total as of 11:05 AM. The rain has now stopped as of the time of the report.
Aug 3, 11:15 AM EDTRAIN 3.65Delran, NJPublic report of 3.65 inches in Delran since midnight. Time from report.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 1.1 hours before the alert went out and 218 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 2026-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1067 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 2026-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.19395878Sfc1 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
1067 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
571 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

851 
WGUS51 KPHI 031308
FFWPHI
DEC003-NJC005-007-015-021-033-PAC017-045-091-101-031715-
/O.NEW.KPHI.FF.W.0092.260803T1308Z-260803T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
908 AM EDT Mon Aug 3 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northeastern New Castle County in northern Delaware...
  Southwestern Mercer County in central New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northeastern Salem County in southern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...

* Until 115 PM EDT.

* At 908 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across I-95 corridor this morning.  Between 1.5 and 3.5 
  inches of rain have fallen through a combination of rain overnight 
  and this morning. The expected rainfall rate is 1 to 2 inches in 1 
  hour. Additional rainfall amounts up to 2 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, Trenton, Camden, Gloucester City, Bensalem, Ewing, 
  Chester, Willingboro, Deptford, West Deptford, Florence and 
  Bellmawr.

This includes the following highways...
	Interstate 295 in New Jersey between mile markers 8 and 30...and
	between mile markers 57 and 59...and
	near mile marker 76.
	Interstate 476 in Pennsylvania between mile markers 0 and 10.
	New Jersey Turnpike near exit 3...and
	between exits 6 and 6A.
	Interstate 76 in Pennsylvania between mile markers 335 and 351.
	Interstate 95 in Pennsylvania between mile markers 0 and 40.
	Interstate 676 in Pennsylvania between mile markers 0 and 1.
	Interstate 676 in New Jersey between mile markers 0 and 4.
	Interstate 76 in New Jersey between mile markers 0 and 3.
	Pennsylvania Turnpike between mile markers 341 and 359.
	Interstate 95 in Delaware between mile markers 21 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3988 7551 3991 7547 4002 7532 4017 7512
      4029 7486 4015 7470 4002 7487 3982 7510
      3977 7526 3972 7538 3985 7555

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

Deal
1 follow-up statement
583 
WGUS71 KPHI 031601
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1201 PM EDT Mon Aug 3 2026

DEC003-NJC005-007-015-021-033-PAC017-045-091-101-031611-
/O.CAN.KPHI.FF.W.0092.000000T0000Z-260803T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Burlington NJ-Camden NJ-Gloucester NJ-Mercer NJ-
Salem NJ-Bucks PA-Delaware PA-Montgomery PA-Philadelphia PA-
1201 PM EDT Mon Aug 3 2026

...FLASH FLOOD WARNING FOR SOUTHWESTERN MERCER AND SOUTHEASTERN 
BUCKS COUNTIES HAS BEEN REPLACED WITH A FLOOD WARNING...
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN CAMDEN, 
NORTHWESTERN GLOUCESTER, NORTHEASTERN SALEM, PHILADELPHIA, 
SOUTHEASTERN MONTGOMERY, NORTHEASTERN NEW CASTLE, NORTHWESTERN 
BURLINGTON AND DELAWARE COUNTIES...

The Flash Flood Warning is being replaced by a Flood Warning as no 
new rainfall is expected to produce flooding for portions of south 
eastern PA. Areas in NJ still remain in a Flash Flood Warning.

&&

LAT...LON 4016 7471 4013 7474 4013 7476 4012 7478
      4013 7482 4010 7484 4008 7486 4007 7493
      4005 7497 4006 7498 4008 7496 4010 7496
      4012 7496 4013 7500 4017 7506 4029 7486

$$

Deal

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 11:20 PM EDTFlash Flood WarningPHIWarren4 hr
Aug 3, 12:05 AM EDTFlash Flood WarningPHIHunterdon, Warren3 hr
Aug 3, 12:36 AM EDTSpecial Marine WarningPHI84 min
Aug 3, 2:50 AM EDTFlash Flood WarningPHIHunterdon, Mercer, Morris, Somerset4 hr
Aug 3, 3:05 AM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Somerset40 min
Aug 3, 4:41 AM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester, Mercer, Middlesex, Somerset2 hr
Aug 3, 5:59 AM EDTFlash Flood WarningPHIMiddlesex, Somerset4 hr
Aug 3, 7:02 AM EDTAreal Flood WarningPHIBurlington, Camden, Gloucester, Mercer, Middlesex, Somerset3 hr
Aug 3, 8:21 AM EDTSpecial Marine WarningPHI69 min
Aug 3, 10:12 AM EDTFlash Flood WarningPHIAtlantic, Cumberland, Salem86 min
Aug 3, 10:36 AM EDTFlash Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean, Somerset6 hr
Aug 3, 10:44 AM EDTFlash Flood Warning Considerable damage threatPHIBurlington, Camden, Gloucester6 hr
Aug 3, 12:01 PM EDTAreal Flood WarningPHIMercer74 min
Aug 3, 1:20 PM EDTAreal Flood WarningPHIBurlington, Camden, Mercer4 hr
Aug 3, 1:51 PM EDTSpecial Marine WarningPHI24 min
Aug 3, 2:53 PM EDTSpecial Marine WarningPHI97 min
Aug 3, 2:57 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean27 min
Aug 3, 5:15 PM EDTSpecial Marine WarningPHI90 min
Aug 3, 3:01 AM EDTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery3 hr
Aug 3, 6:26 AM EDTAreal Flood WarningPHIBucks, Montgomery94 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.