Alert archive / New Jersey / Flash Flood Warnings in 2026

Flash Flood Warning 70, NWS Philadelphia/Mount Holly

July 27, 2026Gloucester County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 27, 2026, 6:59 PM EDT for Gloucester County, New Jersey. It was in force for 2 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 27, 2026, 6:59 PM EDT (22:59 UTC)
Expired: Jul 27, 2026, 9:17 PM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Gloucester County, NJ

The radar

The Philadelphia radar (KDIX), 56 km from the middle of the area, began a volume at 23:01 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 222 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: 199 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 928 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

705 
WGUS51 KPHI 272259
FFWPHI
NJC015-280300-
/O.NEW.KPHI.FF.W.0070.260727T2259Z-260728T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
659 PM EDT Mon Jul 27 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  East Central Gloucester County in southern New Jersey...

* Until 1100 PM EDT.

* At 659 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. The expected rainfall rate is 1.5 to 2.5 inches in 1 
  hour. 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...
  Victory Lakes, Monroe Township and Williamstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3959 7490 3959 7494 3966 7503 3973 7502
      3972 7500 3971 7499 3970 7498 3970 7496
      3970 7494 3969 7493 3966 7491 3965 7491
      3963 7490 3961 7488

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

$$

MJL

1 follow-up statement

897 
WGUS71 KPHI 280117
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
917 PM EDT Mon Jul 27 2026

NJC015-280127-
/O.CAN.KPHI.FF.W.0070.000000T0000Z-260728T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gloucester NJ-
917 PM EDT Mon Jul 27 2026

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL GLOUCESTER 
COUNTY...

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

&&

LAT...LON 3959 7490 3959 7494 3966 7503 3973 7502
      3972 7500 3971 7499 3970 7498 3970 7496
      3970 7494 3969 7493 3966 7491 3965 7491
      3963 7490 3961 7488

$$

MJL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 2:13 AM EDT	Small Craft Advisory	PHI		52 hr
Jul 27, 3:50 AM EDT	Special Marine Warning	PHI		85 min
Jul 27, 1:57 PM EDT	Special Marine Warning	PHI		44 min
Jul 27, 2:15 PM EDT	Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more	38 hr
Jul 27, 2:57 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	48 min
Jul 27, 3:50 PM EDT	Severe Thunderstorm Warning	PHI	Warren	40 min
Jul 27, 4:21 PM EDT	Severe Thunderstorm Warning	PHI	Mercer	39 min
Jul 27, 4:32 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	31 min
Jul 27, 4:38 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset	24 min
Jul 27, 5:06 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	39 min
Jul 27, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden	31 min
Jul 27, 5:43 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	27 min
Jul 27, 5:49 PM EDT	Flash Flood Warning	PHI	Middlesex	3 hr
Jul 27, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Gloucester	39 min
Jul 27, 6:07 PM EDT	Flash Flood Warning	PHI	Atlantic	4 hr
Jul 27, 6:28 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	47 min
Jul 27, 7:12 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	15 min

Nearby

Flash Flood Warnings in New Jersey, 2026 Every 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.