Alert archive / New Jersey / Flash Flood Warnings in 2024
Flash Flood Warning 64, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 18, 2024, 6:36 PM EDT for Morris County, Somerset County, New Jersey. It was in force for 5 hr. 3 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
- Aug 18, 2024, 6:36 PM EDT (22:36 UTC)
- Expired
- Aug 18, 2024, 11:55 PM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 85 km from the middle of the area, began a volume at 22:39 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 |
|---|---|---|---|
| Aug 18, 7:40 PM EDT | FLASH FLOOD | 2 N Manville, NJ | Adamsville Road between Union Ave and US 22 is closed due to flooding. |
| Aug 18, 7:45 PM EDT | FLASH FLOOD | 2 Wnw Martinsville, NJ | West Branch Middle Brook at Martinsville reached flood stage. |
| Aug 18, 11:45 PM EDT | RAIN 4.5 | 1 Wsw Madison, NJ | A lot of ponding of water in the area and a lot of water flowing down the streets. |
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 12:00Z, 10.6 hours before the alert went out and 133 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
- 109 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 582 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 205 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
314
WGUS51 KPHI 182236
FFWPHI
NJC027-035-190245-
/O.NEW.KPHI.FF.W.0064.240818T2236Z-240819T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
636 PM EDT Sun Aug 18 2024
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southeastern Morris County in northern New Jersey...
Northeastern Somerset County in northern New Jersey...
* Until 1045 PM EDT.
* At 636 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 2.5 inches of
rain have fallen. 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...
Morristown, Somerville, Bridgewater, Madison, Middlesex, Florham
Park, East Hanover, Bound Brook, Manville, Chatham, Morris Plains
and Mendham.
This includes the following highways...
Interstate 287 in New Jersey between mile markers 11 and 40.
Interstate 78 in New Jersey between mile markers 29 and 42.
Interstate 80 in New Jersey between mile markers 46 and 48.
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 4091 7427 4086 7432 4080 7436 4076 7438
4075 7436 4069 7443 4069 7445 4067 7446
4066 7445 4066 7440 4065 7440 4062 7443
4058 7451 4056 7453 4053 7450 4054 7460
4056 7465 4073 7471 4088 7434 4087 7434
FLASH FLOOD...RADAR INDICATED
$$
Hoeflich4 follow-up statements
848
WGUS71 KPHI 182254
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
654 PM EDT Sun Aug 18 2024
NJC027-035-190245-
/O.CON.KPHI.FF.W.0064.000000T0000Z-240819T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-
654 PM EDT Sun Aug 18 2024
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT THIS
EVENING FOR SOUTHEASTERN MORRIS AND NORTHEASTERN SOMERSET COUNTIES...
At 654 PM EDT, gauge reports indicated thunderstorms producing heavy
rain in the Morristown area as the Whippany River went into flood
stage. Between 2.5 and 4 inches of rain have fallen. Additional
rainfall amounts of 0.5 to 1.5 inches are possible in the warned
area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Gauges reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
For Whippany River at Morristown:
At 6:35pm the stage was 6.18 feet.
Flood Stage is 6 feet.
This includes the following highways...
Interstate 287 in New Jersey between mile markers 11 and 40.
Interstate 78 in New Jersey between mile markers 30 and 42.
Interstate 80 in New Jersey between mile markers 46 and 48.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4091 7427 4086 7432 4080 7436 4076 7438
4075 7436 4069 7443 4069 7445 4067 7446
4066 7445 4066 7440 4065 7440 4062 7443
4058 7451 4056 7453 4053 7450 4054 7460
4056 7465 4073 7471 4088 7434 4087 7434
FLASH FLOOD...GAUGE INDICATED
$$
Hoeflich880
WGUS71 KPHI 182258
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
658 PM EDT Sun Aug 18 2024
NJC027-035-190245-
/O.CON.KPHI.FF.W.0064.000000T0000Z-240819T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-
658 PM EDT Sun Aug 18 2024
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT THIS
EVENING FOR SOUTHEASTERN MORRIS AND NORTHEASTERN SOMERSET COUNTIES...
At 658 PM EDT, gauge reports indicated thunderstorms producing heavy
rain as the Whippany River at Morristown went into flood stage.
Between 2.5 and 4 inches of rain have fallen. Additional rainfall
amounts of 0.5 to 1.5 inches are possible in the warned area. Flash
flooding is already occurring.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Gauges reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
For Whippany River at Morristown:
At 6:35pm the stage was 6.18 feet and rising.
Flood Stage is 6 feet.
This includes the following highways...
Interstate 287 in New Jersey between mile markers 11 and 40.
Interstate 78 in New Jersey between mile markers 30 and 42.
Interstate 80 in New Jersey between mile markers 46 and 48.
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 4091 7427 4086 7432 4080 7436 4076 7438
4075 7436 4069 7443 4069 7445 4067 7446
4066 7445 4066 7440 4065 7440 4062 7443
4058 7451 4056 7453 4053 7450 4054 7460
4056 7465 4073 7471 4088 7434 4087 7434
FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Hoeflich293
WGUS51 KPHI 190238
FFWPHI
NJC027-035-190445-
/O.EXT.KPHI.FF.W.0064.000000T0000Z-240819T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1038 PM EDT Sun Aug 18 2024
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Southeastern Morris County in northern New Jersey...
Northeastern Somerset County in northern New Jersey...
* Until 1245 AM EDT.
* At 1038 PM EDT, emergency management reported thunderstorms
producing heavy rain with flooding around Morristown, with more
rain coming into the warned area. Between 2.5 and 4 inches of rain
have fallen. Additional rainfall amounts up to 1 inch is possible
in the warned area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Emergency management reported.
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...
Morristown, Somerville, Bridgewater, Madison, Middlesex, Florham
Park, East Hanover, Bound Brook, Manville, Chatham, Morris Plains
and Mendham.
This includes the following highways...
Interstate 287 in New Jersey between mile markers 11 and 40.
Interstate 78 in New Jersey between mile markers 30 and 42.
Interstate 80 in New Jersey between mile markers 46 and 48.
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.
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 7427 4086 7432 4080 7436 4076 7438
4075 7436 4069 7443 4069 7445 4067 7446
4066 7445 4066 7440 4065 7440 4062 7443
4058 7451 4056 7453 4053 7450 4054 7460
4056 7465 4073 7471 4088 7434 4087 7434
FLASH FLOOD...OBSERVED
$$
Hoeflich832
WGUS71 KPHI 190355
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1155 PM EDT Sun Aug 18 2024
NJC027-035-190405-
/O.CAN.KPHI.FF.W.0064.000000T0000Z-240819T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-
1155 PM EDT Sun Aug 18 2024
...FLASH FLOOD WARNING FOR SOUTHEASTERN MORRIS AND NORTHEASTERN
SOMERSET COUNTIES HAS BEEN REPLACED WITH A FLOOD WARNING...
&&
LAT...LON 4091 7427 4086 7432 4080 7436 4076 7438
4075 7436 4069 7443 4069 7445 4067 7446
4066 7445 4066 7440 4065 7440 4062 7443
4058 7451 4056 7453 4053 7450 4054 7460
4056 7465 4073 7471 4088 7434 4087 7434
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 3:09 AM EDT | Flash Flood Warning | PHI | Burlington, Camden | 93 min |
| Aug 18, 4:41 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Mercer | 2 hr |
| Aug 18, 2:17 PM EDT | Special Marine Warning | PHI | 58 min | |
| Aug 18, 2:42 PM EDT | Special Marine Warning | PHI | 93 min | |
| Aug 18, 3:55 PM EDT | Special Marine Warning | PHI | 95 min | |
| Aug 18, 4:04 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 41 min |
| Aug 18, 4:41 PM EDT | Severe Thunderstorm Warning | PHI | Sussex, Warren | 34 min |
| Aug 18, 4:56 PM EDT | Flash Flood Warning | PHI | Warren | 6 hr |
| Aug 18, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Warren | 29 min |
| Aug 18, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 39 min |
| Aug 18, 5:31 PM EDT | Flash Flood Warning | PHI | Hunterdon, Warren | 6 hr |
| Aug 18, 5:38 PM EDT | Flash Flood Warning | PHI | Sussex, Warren | 4 hr |
| Aug 18, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 43 min |
| Aug 18, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth | 58 min |
| Aug 18, 5:51 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Somerset | 24 min |
| Aug 18, 5:59 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 18 min |
| Aug 18, 6:01 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 6 hr |
| Aug 18, 6:24 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 66 min |
Nearby
Flash Flood Warnings in New Jersey, 2024Every flash flood warning in 2024
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.