Alert archive / Pennsylvania / Flash Flood Warnings in 2026

Flash Flood Warning 139, NWS Philadelphia/Mount Holly

August 27, 2026Burlington County, Camden County, New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 27, 2026, 7:00 PM EDT for Burlington County, Camden County, New Jersey; 4 counties in Pennsylvania. 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
Aug 27, 2026, 7:00 PM EDT (23:00 UTC)
Expired
Aug 27, 2026, 9:44 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Burlington County, NJ, Camden County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 70 km from the middle of the area, began a volume at 22:59 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

Brookhaven, NY (KOKX), launched 12:00Z, 11.0 hours before the alert went out and 220 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, Brookhaven, NY at 12:00Z on 2026-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 346 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2026-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 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
346 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
890 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

826 
WGUS51 KPHI 272300
FFWPHI
NJC005-007-PAC017-045-091-101-280300-
/O.NEW.KPHI.FF.W.0139.260827T2300Z-260828T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
700 PM EDT Thu Aug 27 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northwestern Burlington County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  South Central Bucks County in southeastern Pennsylvania...
  Northeastern Delaware County in southeastern Pennsylvania...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...

* Until 1100 PM EDT.

* At 700 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 1 and 2 inches of rain
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
  Additional rainfall amounts of 1 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 indicated.

  IMPACT...Flash flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other poor
           drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Philadelphia, Camden, Gloucester City, Bensalem, Yeadon, Riverside,
  Conshohocken, Palmyra, Jenkintown, Westville and Narberth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4008 7540 4016 7505 4012 7490 4011 7488
      4008 7487 3987 7513 3989 7514 3988 7517
      3994 7529 4002 7542 4003 7540 4004 7541
      4007 7536 4007 7537 4006 7539

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

$$

PHI
2 follow-up statements
723 
WGUS71 KPHI 280046
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
846 PM EDT Thu Aug 27 2026

NJC005-007-PAC017-045-091-101-280300-
/O.CON.KPHI.FF.W.0139.000000T0000Z-260828T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Bucks PA-Delaware PA-Montgomery PA-
Philadelphia PA-
846 PM EDT Thu Aug 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 11 PM EDT THIS EVENING
FOR NORTHWESTERN BURLINGTON, NORTHWESTERN CAMDEN, SOUTH CENTRAL
BUCKS, NORTHEASTERN DELAWARE, SOUTHEASTERN MONTGOMERY AND
PHILADELPHIA COUNTIES...

At 846 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2.5 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 indicated.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Philadelphia, Camden, Gloucester City, Bensalem, Yeadon, Riverside,
  Conshohocken, Palmyra, Jenkintown, Westville and Narberth.

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 4008 7540 4016 7505 4012 7490 4011 7488
      4008 7487 3987 7513 3989 7514 3988 7517
      3994 7529 4002 7542 4003 7540 4004 7541
      4007 7536 4007 7537 4006 7539

FLASH FLOOD...RADAR INDICATED

$$

PHI
923 
WGUS71 KPHI 280144
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
944 PM EDT Thu Aug 27 2026

NJC005-007-PAC017-045-091-101-280154-
/O.CAN.KPHI.FF.W.0139.000000T0000Z-260828T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Bucks PA-Delaware PA-Montgomery PA-
Philadelphia PA-
944 PM EDT Thu Aug 27 2026

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BURLINGTON,
NORTHWESTERN CAMDEN, SOUTH CENTRAL BUCKS, NORTHEASTERN DELAWARE,
SOUTHEASTERN MONTGOMERY AND PHILADELPHIA 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 400 AM EDT Friday for portions
of northern Delaware, New Jersey, and Pennsylvania.

&&

LAT...LON 4008 7540 4016 7505 4012 7490 4011 7488
      4008 7487 3987 7513 3989 7514 3988 7517
      3994 7529 4002 7542 4003 7540 4004 7541
      4007 7536 4007 7537 4006 7539

$$

PHI

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 11:38 AM EDTFlash Flood WarningPHIGloucester4 hr
Aug 27, 12:26 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester49 min
Aug 27, 12:41 PM EDTFlash Flood WarningPHICamden, Gloucester, Salem5 hr
Aug 27, 1:06 PM EDTSevere Thunderstorm WarningPHIMiddlesex24 min
Aug 27, 1:07 PM EDTFlash Flood WarningPHIMiddlesex, Somerset4 hr
Aug 27, 1:15 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester45 min
Aug 27, 1:17 PM EDTFlash Flood WarningPHIMercer, Somerset7 hr
Aug 27, 1:20 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth40 min
Aug 27, 1:26 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth49 min
Aug 27, 1:32 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem43 min
Aug 27, 1:34 PM EDTSpecial Marine WarningPHI21 min
Aug 27, 1:50 PM EDTFlash Flood WarningPHISalem4 hr
Aug 27, 1:57 PM EDTTornado WarningPHISalem11 min
Aug 27, 2:02 PM EDTSevere Thunderstorm WarningPHIMonmouth28 min
Aug 27, 2:13 PM EDTSevere Thunderstorm WarningPHIMonmouth47 min
Aug 27, 2:16 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester, Salem44 min
Aug 27, 2:18 PM EDTFlash Flood WarningPHIMiddlesex, Monmouth4 hr
Aug 27, 2:20 PM EDTSpecial Marine WarningPHI40 min
Aug 27, 2:31 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean44 min
Aug 27, 2:38 PM EDTFlash Flood WarningPHICamden4 hr
Aug 27, 2:58 PM EDTSevere Thunderstorm WarningPHIMonmouth30 min
Aug 27, 3:00 PM EDTSpecial Marine WarningPHI60 min
Aug 27, 3:04 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden41 min
Aug 27, 3:26 PM EDTAreal Flood WarningPHIGloucester, Salem5 hr
Aug 27, 3:43 PM EDTFlash Flood WarningPHICamden3 hr
Aug 27, 4:52 PM EDTFlash Flood WarningPHIWarren3 hr
Aug 27, 4:59 PM EDTAreal Flood WarningPHIMiddlesex, Somerset4 hr
Aug 27, 5:44 PM EDTAreal Flood WarningPHICamden, Gloucester5 hr
Aug 27, 6:17 PM EDTAreal Flood WarningPHIMiddlesex, Monmouth4 hr
Aug 27, 7:26 PM EDTSpecial Marine WarningPHI32 min
Aug 27, 4:06 PM EDTSevere Thunderstorm WarningPHIChester39 min
Aug 27, 5:08 PM EDTFlash Flood WarningPHIChester, Montgomery4 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2026Flash Flood Warnings in New Jersey, 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.