Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 149, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 1, 2026, 7:13 PM EDT for Morris 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
- Sep 1, 2026, 7:13 PM EDT (23:13 UTC)
- Expired
- Sep 1, 2026, 9:16 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Morris County, NJ
The radar
The Philadelphia radar (KDIX), 111 km from the middle of the area, began a volume at 23:16 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, 11.2 hours before the alert went out and 129 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
- 17 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 481 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
181
WGUS51 KPHI 012313
FFWPHI
NJC027-020315-
/O.NEW.KPHI.FF.W.0149.260901T2313Z-260902T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
713 PM EDT Tue Sep 1 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Eastern Morris County in northern New Jersey...
* Until 1115 PM EDT.
* At 713 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...
Morristown, Madison, Florham Park, East Hanover, Lincoln Park,
Kinnelon, Boonton, Butler, Rockaway, Morris Plains, Mountain Lakes
and Riverdale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
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 4071 7441 4098 7460 4103 7456 4109 7450
4108 7449 4103 7450 4105 7445 4104 7443
4102 7443 4100 7430 4098 7430 4097 7428
4093 7429 4091 7427 4090 7428 4091 7433
4087 7434 4086 7432 4083 7433
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MPS1 follow-up statement
835
WGUS71 KPHI 020116
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
916 PM EDT Tue Sep 1 2026
NJC027-020126-
/O.CAN.KPHI.FF.W.0149.000000T0000Z-260902T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-
916 PM EDT Tue Sep 1 2026
...FLASH FLOOD WARNING IS CANCELLED FOR EASTERN MORRIS COUNTY...
The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
&&
LAT...LON 4071 7441 4098 7460 4103 7456 4109 7450
4108 7449 4103 7450 4105 7445 4104 7443
4102 7443 4100 7430 4098 7430 4097 7428
4093 7429 4091 7427 4090 7428 4091 7433
4087 7434 4086 7432 4083 7433
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 2:30 AM EDT | Heat Advisory | PHI | Burlington, Camden, Gloucester, Mercer | 18 hr |
| Sep 1, 4:47 PM EDT | Special Marine Warning | PHI | 43 min | |
| Sep 1, 5:45 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 45 min |
| Sep 1, 6:52 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth, Morris, Somerset | 38 min |
| Sep 1, 6:56 PM EDT | Special Marine Warning | PHI | 64 min | |
| Sep 1, 7:02 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 43 min |
| Sep 1, 7:28 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 47 min |
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.