Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 73, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 28, 2026, 2:11 PM EDT for Hunterdon County, Mercer County, Somerset County, New Jersey. It was in force for 4 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, 2:11 PM EDT (18:11 UTC)
- Expired
- Jul 28, 2026, 6:01 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Mercer County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 64 km from the middle of the area, began a volume at 18:11 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, 6.2 hours before the alert went out and 164 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
- 1266 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
808
WGUS51 KPHI 281811
FFWPHI
NJC019-021-035-282215-
/O.NEW.KPHI.FF.W.0073.260728T1811Z-260728T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
211 PM EDT Tue Jul 28 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northern Mercer County in central New Jersey...
Southwestern Somerset County in northern New Jersey...
Southeastern Hunterdon County in northwestern New Jersey...
* Until 615 PM EDT.
* At 211 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across portions of the warned area. Between 0.5 and 1.5
inches of rain have 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...
Flemington, Hopewell, Cloverhill, Skillman and Flagtown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4052 7468 4040 7466 4038 7479 4051 7486
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR
$$
Kruzdlo1 follow-up statement
034 WGUS71 KPHI 282201 FFSPHI Flash Flood Statement National Weather Service Mount Holly NJ 601 PM EDT Tue Jul 28 2026 NJC019-021-035-282211- /O.CAN.KPHI.FF.W.0073.000000T0000Z-260728T2215Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hunterdon NJ-Mercer NJ-Somerset NJ- 601 PM EDT Tue Jul 28 2026 ...FLASH FLOOD WARNING IS CANCELLED FOR NORTHERN MERCER, SOUTHWESTERN SOMERSET AND SOUTHEASTERN HUNTERDON COUNTIES... Flood waters have receded. Please continue to heed remaining road closures. A Flood Watch remains in effect until 800 PM EDT Wednesday for portions of New Jersey and Pennsylvania as additional rainfall is expected. A Flood Watch remains in effect until 200 PM EDT Wednesday for portions of northern Delaware, New Jersey, and Pennsylvania. && LAT...LON 4052 7468 4040 7466 4038 7479 4051 7486 $$ AKL
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 1:22 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 38 min |
| Jul 28, 1:31 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren | 44 min |
| Jul 28, 1:49 PM EDT | Tornado Warning | PHI | Sussex, Warren | 26 min |
| Jul 28, 2:04 PM EDT | Flash Flood Warning | PHI | Warren | 10 hr |
| Jul 28, 2:15 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 45 min |
| Jul 28, 2:45 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Warren | 9 hr |
| Jul 28, 2:56 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Sussex | 49 min |
| Jul 28, 3:04 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 41 min |
| Jul 28, 3:43 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 23 min |
| Jul 28, 4:02 PM EDT | Flash Flood Warning | PHI | Middlesex | 2 hr |
| Jul 28, 5:22 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 34 min |
| Jul 28, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 43 min |
| Jul 28, 6:10 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Jul 28, 6:16 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset | 25 min |
| Jul 28, 6:17 PM EDT | Flash Flood Warning | PHI | Hunterdon, Warren | 6 hr |
| Jul 28, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 67 min |
| Jul 28, 6:46 PM EDT | Tornado Warning | PHI | Gloucester, Salem | 29 min |
| Jul 28, 6:55 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Gloucester, Salem | 50 min |
| Jul 28, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Cumberland, Gloucester, Salem | 54 min |
| Jul 28, 7:11 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester, Salem | 3 hr |
| Jul 28, 7:23 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Jul 28, 7:37 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland, Salem | 23 min |
| Jul 28, 7:55 PM EDT | Flash Flood Warning | PHI | Hunterdon | 4 hr |
Nearby
Flash 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.