Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 106, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 6, 2026, 12:31 AM EDT for Morris 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
- Aug 6, 2026, 12:31 AM EDT (04:31 UTC)
- Expired
- Aug 6, 2026, 4:30 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Morris County, NJ
The radar
The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 04:32 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, 4.5 hours before the alert went out and 126 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
- 94 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 462 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
561
WGUS51 KPHI 060431
FFWPHI
NJC027-060830-
/O.NEW.KPHI.FF.W.0106.260806T0431Z-260806T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1231 AM EDT Thu Aug 6 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northeastern Morris County in northern New Jersey...
* Until 430 AM EDT.
* At 1231 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1.5 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.
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...
Lincoln Park, Kinnelon, Boonton, Butler, Riverdale, Pequannock
Township, Green Pond and Lake Telemark.
This includes Interstate 287 in New Jersey between mile markers 46
and 53.
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 4091 7433 4089 7434 4087 7434 4097 7454
4105 7444 4104 7443 4102 7443 4103 7442
4101 7439 4101 7436 4100 7435 4101 7434
4100 7431 4100 7430 4099 7429 4098 7430
4097 7428 4095 7428 4091 7430
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MPS2 follow-up statements
616
WGUS71 KPHI 060558
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
158 AM EDT Thu Aug 6 2026
NJC027-060830-
/O.CON.KPHI.FF.W.0106.000000T0000Z-260806T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-
158 AM EDT Thu Aug 6 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 AM EDT EARLY THIS
MORNING FOR NORTHEASTERN MORRIS COUNTY...
At 158 AM EDT, Doppler radar indicated thunderstorms produced heavy
rain across the warned area, and additonal rainfall is likely.
Between 1.5 and 2.5 inches of rain have fallen. Additional rainfall
amounts of up to 0.5 inches are possible in the warned area. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Lincoln Park, Kinnelon, Boonton, Butler, Riverdale, Pequannock
Township, Green Pond and Lake Telemark.
This includes Interstate 287 in New Jersey between mile markers 46
and 53.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4091 7433 4089 7434 4087 7434 4097 7454
4105 7444 4104 7443 4102 7443 4103 7442
4101 7439 4101 7436 4100 7435 4101 7434
4100 7431 4100 7430 4099 7429 4098 7430
4097 7428 4095 7428 4091 7430
FLASH FLOOD...RADAR INDICATED
$$
MPS977
WGUS71 KPHI 060706
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
306 AM EDT Thu Aug 6 2026
NJC027-060830-
/O.CON.KPHI.FF.W.0106.000000T0000Z-260806T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-
306 AM EDT Thu Aug 6 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 AM EDT EARLY THIS
MORNING FOR NORTHEASTERN MORRIS COUNTY...
At 306 AM EDT, Doppler radar and automated rain gauges indicated
thunderstorms produced heavy rain across the warned area. Between
1.5 and 2.5 inches of rain have fallen. Flooding impacts will
continue, but no additional rainfall is expected. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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...
Lincoln Park, Kinnelon, Boonton, Butler, Riverdale, Pequannock
Township, Green Pond and Lake Telemark.
This includes Interstate 287 in New Jersey between mile markers 46
and 53.
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 4091 7433 4089 7434 4087 7434 4097 7454
4105 7444 4104 7443 4102 7443 4103 7442
4101 7439 4101 7436 4100 7435 4101 7434
4100 7431 4100 7430 4099 7429 4098 7430
4097 7428 4095 7428 4091 7430
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 11:40 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Somerset | 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.