Alert archive / New Jersey / Flash Flood Warnings in 2024
Flash Flood Warning 33, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 6, 2024, 5:29 PM EDT for 4 counties in New Jersey. It was in force for 6 hr. 4 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 6, 2024, 5:29 PM EDT (21:29 UTC)
- Expired
- Aug 6, 2024, 11:22 PM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 77 km from the middle of the area, began a volume at 21:30 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 6, 8:45 PM EDT | RAIN 3.4 | 1 N Pleasant Plains, NJ | Mesonet station BKRN4 1.3 N Pleasant Plains. |
| Aug 6, 9:45 PM EDT | RAIN 2.46 | 2 Ene Somerville, NJ | Mesonet station FW7617 Bridgewater. |
| Aug 6, 9:49 PM EDT | RAIN 2.13 | 3 Nnw Bridgewater, NJ | Mesonet station FW8114 Bridgewater. |
| Aug 6, 9:50 PM EDT | RAIN 2.28 | 2 Sse Readington, NJ | Mesonet station CW6872 Branchburg. |
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, 9.5 hours before the alert went out and 141 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
- 1440 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 797 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.2
The text
As transmitted.
451
WGUS51 KPHI 062129
FFWPHI
NJC019-023-027-035-070130-
/O.NEW.KPHI.FF.W.0033.240806T2129Z-240807T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
529 PM EDT Tue Aug 6 2024
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
North Central Middlesex County in northern New Jersey...
South Central Morris County in northern New Jersey...
Somerset County in northern New Jersey...
East Central Hunterdon County in northwestern New Jersey...
* Until 930 PM EDT.
* At 529 PM EDT, Doppler radar and automated rain gauges 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 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...
New Brunswick, Somerville, Somerset, Bridgewater, Middlesex, Bound
Brook, Manville, Mendham, Flemington, Peapack And Gladstone, Far
Hills and Millstone.
This includes the following highways...
Interstate 287 in New Jersey between mile markers 4 and 32.
Interstate 78 in New Jersey between mile markers 23 and 42.
This includes the following streams and drainages...
Back Brook RARITAN, Primrose Brook HACKENSACK-PASSAIC, Black Brook
HACKENSACK-PASSAIC, Ireland Brook RARITAN, Simonson Brook RARITAN,
RARITAN, Wickecheoke Creek MIDDLE DELAWARE-MUSCONETCONG, Green
Brook RARITAN, Beden Brook RARITAN, Harrisons Brook
HACKENSACK-PASSAIC, West Branch Middle Brook RARITAN, Millstone
River RARITAN, Lamington River RARITAN, Bound Brook RARITAN, Penns
Brook HACKENSACK-PASSAIC, Indian Grove Brook HACKENSACK-PASSAIC,
Ambrose Brook RARITAN, Passaic River HACKENSACK-PASSAIC, Mill
Brook RARITAN, Oakeys Brook RARITAN, Plum Brook MIDDLE
DELAWARE-MUSCONETCONG, Royce Brook RARITAN, Third Neshanic River
RARITAN, Bonygutt Brook RARITAN, Holland Brook RARITAN, Cold Brook
RARITAN, North Branch Raritan River RARITAN, Pike Run RARITAN,
Roaring Brook RARITAN, HACKENSACK-PASSAIC, Middle Brook RARITAN,
Hoopstick Brook RARITAN, Dukes Brook RARITAN, Chambers Brook
RARITAN, East Branch Middle Brook RARITAN, First Neshanic River
RARITAN, Assiscong Creek RARITAN, Raritan River RARITAN, South
Branch Raritan River RARITAN and Sixmile Run RARITAN.
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 4074 7472 4077 7455 4070 7442 4070 7443
4067 7446 4066 7445 4066 7443 4066 7442
4067 7441 4066 7440 4062 7443 4060 7446
4061 7433 4044 7450 4043 7465 4047 7496
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MJL2 follow-up statements
884
WGUS51 KPHI 070055
FFWPHI
NJC019-023-027-035-070330-
/O.EXT.KPHI.FF.W.0033.000000T0000Z-240807T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
855 PM EDT Tue Aug 6 2024
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
North Central Middlesex County in northern New Jersey...
South Central Morris County in northern New Jersey...
Somerset County in northern New Jersey...
East Central Hunterdon County in northwestern New Jersey...
* Until 1130 PM EDT.
* At 855 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms produced heavy rain across the warned area. Between
1 and 2 inches of rain have fallen. Another round of strong
thunderstorms with rainfall rates of 1 to 2 inches per hour is
expected. 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 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...
New Brunswick, Somerville, Somerset, Bridgewater, Middlesex, Bound
Brook, Manville, Mendham, Flemington, Peapack And Gladstone, Far
Hills and Millstone.
This includes the following highways...
Interstate 287 in New Jersey between mile markers 4 and 31.
Interstate 78 in New Jersey between mile markers 23 and 42.
This includes the following streams and drainages...
Back Brook RARITAN, Primrose Brook HACKENSACK-PASSAIC, Black Brook
HACKENSACK-PASSAIC, Ireland Brook RARITAN, Simonson Brook RARITAN,
RARITAN, Wickecheoke Creek MIDDLE DELAWARE-MUSCONETCONG, Green
Brook RARITAN, Beden Brook RARITAN, Harrisons Brook
HACKENSACK-PASSAIC, West Branch Middle Brook RARITAN, Millstone
River RARITAN, Lamington River RARITAN, Bound Brook RARITAN, Penns
Brook HACKENSACK-PASSAIC, Indian Grove Brook HACKENSACK-PASSAIC,
Ambrose Brook RARITAN, Passaic River HACKENSACK-PASSAIC, Mill
Brook RARITAN, Oakeys Brook RARITAN, Plum Brook MIDDLE
DELAWARE-MUSCONETCONG, Royce Brook RARITAN, Third Neshanic River
RARITAN, Bonygutt Brook RARITAN, Holland Brook RARITAN, Cold Brook
RARITAN, North Branch Raritan River RARITAN, Pike Run RARITAN,
Roaring Brook RARITAN, HACKENSACK-PASSAIC, Middle Brook RARITAN,
Hoopstick Brook RARITAN, Dukes Brook RARITAN, Chambers Brook
RARITAN, East Branch Middle Brook RARITAN, First Neshanic River
RARITAN, Assiscong Creek RARITAN, Raritan River RARITAN, South
Branch Raritan River RARITAN and Sixmile Run RARITAN.
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.
&&
LAT...LON 4074 7472 4077 7455 4070 7442 4070 7443
4067 7446 4066 7445 4066 7443 4066 7442
4067 7441 4066 7440 4062 7443 4060 7446
4061 7433 4044 7450 4043 7465 4047 7496
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MJL660
WGUS71 KPHI 070322
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1122 PM EDT Tue Aug 6 2024
NJC019-023-027-035-070332-
/O.CAN.KPHI.FF.W.0033.000000T0000Z-240807T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Middlesex NJ-Morris NJ-Somerset NJ-
1122 PM EDT Tue Aug 6 2024
...FLASH FLOOD WARNING FOR NORTH CENTRAL MIDDLESEX, SOUTH CENTRAL
MORRIS, SOMERSET AND EAST CENTRAL HUNTERDON COUNTIES HAS BEEN
REPLACED WITH A FLOOD WARNING...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 1200 PM EDT Wednesday for
portions of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4074 7472 4077 7455 4070 7442 4070 7443
4067 7446 4066 7445 4066 7443 4066 7442
4067 7441 4066 7440 4062 7443 4060 7446
4061 7433 4044 7450 4043 7465 4047 7496
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 9:37 AM EDT | Heat Advisory | PHI | Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more | 9 hr |
| Aug 6, 9:39 AM EDT | Small Craft Advisory | PHI | 10 hr | |
| Aug 6, 2:04 PM EDT | Special Marine Warning | PHI | 56 min | |
| Aug 6, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 19 min |
| Aug 6, 2:55 PM EDT | Special Marine Warning | PHI | 65 min | |
| Aug 6, 3:15 PM EDT | Special Marine Warning | PHI | 60 min | |
| Aug 6, 3:18 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 27 min |
| Aug 6, 3:21 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 23 min |
| Aug 6, 3:23 PM EDT | Severe Thunderstorm Warning | PHI | Mercer, Middlesex, Monmouth | 37 min |
| Aug 6, 3:45 PM EDT | Flash Flood Warning | PHI | Middlesex, Monmouth | 2 hr |
| Aug 6, 3:49 PM EDT | Severe Thunderstorm Warning | PHI | Mercer, Middlesex, Monmouth | 56 min |
| Aug 6, 4:10 PM EDT | Special Marine Warning | PHI | 65 min | |
| Aug 6, 4:13 PM EDT | Flash Flood Warning | PHI | Mercer, Middlesex, Monmouth | 8 hr |
| Aug 6, 4:32 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Somerset | 43 min |
| Aug 6, 4:37 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 40 min |
| Aug 6, 4:55 PM EDT | Flash Flood Warning | PHI | Monmouth | 6 hr |
| Aug 6, 4:56 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 49 min |
| Aug 6, 5:06 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 54 min |
| Aug 6, 5:36 PM EDT | Flash Flood Warning | PHI | Monmouth, Ocean | 8 hr |
| Aug 6, 6:37 PM EDT | Flash Flood Warning | PHI | Warren | 3 hr |
| Aug 6, 6:39 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 5 hr |
| Aug 6, 6:46 PM EDT | Flash Flood Warning | PHI | Morris, Somerset | 4 hr |
| Aug 6, 6:57 PM EDT | Flash Flood Warning | PHI | Warren | 3 hr |
| Aug 6, 7:04 PM EDT | Flash Flood Warning | PHI | Burlington | 5 hr |
| Aug 6, 7:24 PM EDT | Flash Flood Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 5 hr |
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.