Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 155, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 13, 2026, 5:54 AM EDT for Morris County, New Jersey. It was in force for 6 hr. 17 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 13, 2026, 5:54 AM EDT (09:54 UTC)
- Expired
- Sep 13, 2026, 12:00 PM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Morris County, NJ
The radar
The Philadelphia radar (KDIX), 101 km from the middle of the area, began a volume at 09:53 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 13, 6:30 AM EDT | FLASH FLOOD | East Hanover, NJ | Water rescue in East Hanover Township due to a vehicle stuck in flood waters. Time estimated. |
| Sep 13, 7:18 AM EDT | RAIN 2.11 | 1 Sw Mountain Lakes, NJ | Mesonet station DW1105 Denville. |
| Sep 13, 7:45 AM EDT | RAIN 2.6 | 1 Nw Florham Park, NJ | Mesonet station MSTN4 1.4 NW Florham Park. |
| Sep 13, 8:00 AM EDT | FLASH FLOOD | Morris Twp, NJ | Roads flooded in Morris Township with some impassable. Time estimated. |
| Sep 13, 8:00 AM EDT | RAIN 2.44 | 2 Wnw Morris Plains, NJ | Mesonet station MSPN4 2.2 SW Denville. |
| Sep 13, 8:05 AM EDT | RAIN 2.42 | 1 Sw Towaco, NJ | Mesonet station FW2458 Montville. |
| Sep 13, 8:07 AM EDT | RAIN 2.32 | Whippany, NJ | Mesonet station FW7566 Whippany. |
| Sep 13, 8:09 AM EDT | RAIN 2.08 | Boonton Twp, NJ | Mesonet station AV873 Boonton. |
| Sep 13, 11:45 AM EDT | RAIN 3.6 | 2 Wnw Morris Plains, NJ | Mesonet station MSPN4 2.2 SW Denville. |
| Sep 13, 11:45 AM EDT | RAIN 4.32 | 1 Nw Florham Park, NJ | Mesonet station MSTN4 1.4 NW Florham Park. |
| Sep 13, 12:00 PM EDT | RAIN 2.36 | 1 Se Boonton, NJ | CO-OP Observer station BOON4 0.9 SE Boonton. |
| Sep 13, 12:00 PM EDT | RAIN 4.04 | Lincoln Park, NJ | Mesonet station LNPN4 Lincoln Park. |
| Sep 13, 12:05 PM EDT | RAIN 2.55 | 1 Ese Ironia, NJ | Mesonet station EW6513 Randolph. |
| Sep 13, 12:06 PM EDT | RAIN 2.95 | Boonton Twp, NJ | Mesonet station AV873 Boonton. |
| Sep 13, 12:09 PM EDT | RAIN 3.96 | Whippany, NJ | Mesonet station FW7566 Whippany. |
| Sep 13, 12:09 PM EDT | RAIN 4.28 | 1 Sw Towaco, NJ | Mesonet station FW2458 Montville. |
| Sep 13, 12:10 PM EDT | RAIN 2.51 | Morris Plains, NJ | Mesonet station FW7545 Morris Plains. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 9.9 hours before the alert went out and 128 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1254 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
932
WGUS51 KPHI 130954
FFWPHI
NJC027-131400-
/O.NEW.KPHI.FF.W.0155.260913T0954Z-260913T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
554 AM EDT Sun Sep 13 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southeastern Morris County in northern New Jersey...
* Until 1000 AM EDT.
* At 554 AM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1 and 1.5 inches of rain have fallen. The expected rainfall rate is
1 to 2 inches in 1 hour. Additional rainfall amounts of 0.5 to 1
inch are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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, Chatham, Boonton, Butler, Rockaway and Morris Plains.
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.
&&
LAT...LON 4076 7466 4088 7455 4101 7438 4100 7430
4098 7430 4097 7428 4093 7429 4091 7427
4090 7427 4091 7433 4087 7434 4086 7432
4085 7433 4082 7433 4080 7436 4076 7438
4076 7436 4072 7439 4071 7442 4075 7448
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$3 follow-up statements
787
WGUS71 KPHI 131108
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
708 AM EDT Sun Sep 13 2026
NJC027-131400-
/O.CON.KPHI.FF.W.0155.000000T0000Z-260913T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-
708 AM EDT Sun Sep 13 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 AM EDT THIS MORNING
FOR SOUTHEASTERN MORRIS COUNTY...
At 708 AM EDT, Doppler radar and automated rain gauges indicated that
heavy rain was falling across the warned area. Between 2 and 2.5
inches of rain have fallen. The expected rainfall rate is 1 to 2
inches in 1 hour. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. Flash flooding is ongoing or expected to
begin shortly.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Morristown, Madison, Florham Park, East Hanover, Lincoln Park,
Kinnelon, Chatham, Boonton, Butler, Rockaway and Morris Plains.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4076 7466 4088 7455 4101 7438 4100 7430
4098 7430 4097 7428 4093 7429 4091 7427
4090 7427 4091 7433 4087 7434 4086 7432
4085 7433 4082 7433 4080 7436 4076 7438
4076 7436 4072 7439 4071 7442 4075 7448
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$584
WGUS51 KPHI 131331
FFWPHI
NJC027-131600-
/O.EXT.KPHI.FF.W.0155.000000T0000Z-260913T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
931 AM EDT Sun Sep 13 2026
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Southeastern Morris County in northern New Jersey...
* Until noon EDT.
* At 931 AM EDT, Doppler radar and automated rain gauges indicated
heavy rain falling across the warned area. Between 2 and 3 inches
of rain have fallen across much of the warned area. The expected
rainfall rate is 1 to 3 inches in 1 hour. Additional rainfall
amounts of 0.5 to 1 inch are possible in the warned area. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar and automated gauges.
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, Chatham, Boonton, Butler, Rockaway and Morris Plains.
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.
&&
LAT...LON 4076 7466 4088 7455 4101 7438 4100 7430
4098 7430 4097 7428 4093 7429 4091 7427
4090 7427 4091 7433 4087 7434 4086 7432
4085 7433 4082 7433 4080 7436 4076 7438
4076 7436 4072 7439 4071 7442 4075 7448
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR
$$
Gorse911
WGUS71 KPHI 131552
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1152 AM EDT Sun Sep 13 2026
NJC027-131602-
/O.EXP.KPHI.FF.W.0155.000000T0000Z-260913T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-
1152 AM EDT Sun Sep 13 2026
...FLASH FLOOD WARNING WILL EXPIRE AT NOON EDT TODAY FOR SOUTHEASTERN
MORRIS COUNTY...
Flood waters are receding, and the heaviest rain has ended. Flooding
is no longer expected to pose a threat. Please continue to heed any
remaining road closures.
&&
LAT...LON 4076 7466 4088 7455 4101 7438 4100 7430
4098 7430 4097 7428 4093 7429 4091 7427
4090 7427 4091 7433 4087 7434 4086 7432
4085 7433 4082 7433 4080 7436 4076 7438
4076 7436 4072 7439 4071 7442 4075 7448
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 4:37 AM EDT | Special Marine Warning | PHI | 53 min | |
| Sep 13, 8:06 AM EDT | Flash Flood Warning | PHI | Mercer, Middlesex | 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.