Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 120, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 17, 2026, 4:43 AM EDT for New Castle County, Delaware; Cumberland County, Salem 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
- Aug 17, 2026, 4:43 AM EDT (08:43 UTC)
- Expired
- Aug 17, 2026, 6:49 AM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties New Castle County, DE, Cumberland County, NJ, Salem County, NJ
The radar
The Dover AFB radar (KDOX), 69 km from the middle of the area, began a volume at 08:47 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 00:00Z, 8.7 hours before the alert went out and 272 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.
- Mixed-layer CAPE
- 28 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 851 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
777
WGUS51 KPHI 170843
FFWPHI
DEC003-NJC011-033-171245-
/O.NEW.KPHI.FF.W.0120.260817T0843Z-260817T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
443 AM EDT Mon Aug 17 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southwestern New Castle County in northern Delaware...
Central Cumberland County in southern New Jersey...
Salem County in southern New Jersey...
* Until 845 AM EDT.
* At 443 AM EDT, Doppler radar indicated 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 heavy rain.
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...
Vineland, Millville, Bridgeton, Middletown, Cumberland,
Pennsville, Salem, Laurel Lake, Woodstown, Alloway, Quinton and
Delaware City.
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.
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 3961 7576 3968 7526 3962 7515 3931 7489
3933 7552 3935 7549 3937 7551 3935 7555
3933 7557 3933 7575
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MPS1 follow-up statement
316
WGUS71 KPHI 171049
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
649 AM EDT Mon Aug 17 2026
DEC003-NJC011-033-171059-
/O.CAN.KPHI.FF.W.0120.000000T0000Z-260817T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Cumberland NJ-Salem NJ-
649 AM EDT Mon Aug 17 2026
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN NEW CASTLE,
CENTRAL CUMBERLAND AND SALEM COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat.
&&
LAT...LON 3961 7576 3968 7526 3962 7515 3931 7489
3933 7552 3935 7549 3937 7551 3935 7555
3933 7557 3933 7575
$$
KruzdloThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 32 min |
| Aug 17, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 20 min |
| Aug 16, 11:38 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 4 hr |
| Aug 17, 6:09 PM EDT | Special Marine Warning | PHI | 81 min |
Nearby
Flash Flood Warnings in New Jersey, 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.