Alert archive / New Jersey / Flash Flood Warnings in 2023
Flash Flood Warning 54, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 15, 2023, 5:18 PM EDT for 4 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 4 hr. 33 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
- Jul 15, 2023, 5:18 PM EDT (21:18 UTC)
- Expired
- Jul 15, 2023, 9:30 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 21:18 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 |
|---|---|---|---|
| Jul 15, 5:18 PM EDT | FLOOD | Yardley, PA | Report of Street Flooding along Route 32 (River Road) in Yardley. |
| Jul 15, 5:24 PM EDT | FLOOD | 1 Nw Rocky Hill, NJ | Video of street flooding at the intersection of Sycamore Lane and Route 206. |
| Jul 15, 5:30 PM EDT | FLOOD | 1 Sw Washington Crossin, PA | Significant flooding occurred earlier at the intersection of Wrightstown Rd and Washington Crossing Road. Time estimated. |
| Jul 15, 5:32 PM EDT | FLASH FLOOD | 2 Sw Washington Crossin, PA | Trained Spotter relays report of a water rescue at the intersection of Washington Crossing Road and Dolington Acres Rd in Washington Crossing. Time estimated. |
| Jul 15, 5:35 PM EDT | FLOOD | 1 Ene Highland Park, NJ | NJ DOT - STMC: Flooding on US 1 southbound Plainfield Av (Edison Twp) All lanes closed. |
| Jul 15, 5:35 PM EDT | FLASH FLOOD | 1 Ene Highland Park, NJ | Much of Route 1 South in Edison is flooded. All lanes are closed. With a report of several stalled cars. |
| Jul 15, 5:36 PM EDT | FLOOD | 2 Wsw Trenton Mercer Ai, NJ | NJ DOT - STMC: Flooding on NJ 29 both directions Bernard Dr (Ewing Twp) All lanes closed. Time estimated. |
| Jul 15, 5:37 PM EDT | FLOOD | 1 W North Brunswick, NJ | Photo of street flooding on Omaha Road between Aex Ave and Redmond St in North Brunswick. |
| Jul 15, 5:41 PM EDT | FLOOD | 1 Sw Sayreville, NJ | Report of street flooding at the intersection of Jernee Mill Rd and Washington Rd in Sayreville. Time estimated. |
| Jul 15, 5:56 PM EDT | FLOOD | 1 Sw North Brunswick, NJ | NJ DOT - STMC: Flooding on US 1 northbound ramp to Adams Ln/Cozzens Ln (North Brunswick Twp) All lanes closed. |
| Jul 15, 6:00 PM EDT | FLOOD | 1 Nnw Hopelawn, NJ | Social media report and pictures showing roadway flooding on US Route 9 near Woodbridge. Water appears to be about 1 to 2 feet deep. Estimated time. |
| Jul 15, 6:00 PM EDT | FLOOD | 1 Wnw South River, NJ | NJ DOT - STMC: Flooding on NJ 18 northbound South of West Prospect St (East Brunswick Twp) All lanes closed. |
| Jul 15, 6:19 PM EDT | FLOOD | 1 Nw North Brunswick, NJ | NJ DOT - STMC: Flooding on NJ 27 both directions South of CR 617/Franklin Blvd (New Brunswick) All lanes closed. |
| Jul 15, 6:30 PM EDT | FLOOD | 2 Wsw Trenton Mercer Ai, NJ | NJ Route 29 near Duffield Drive closed due to flooding. |
| Jul 15, 6:55 PM EDT | FLOOD | 1 Sw North Brunswick, NJ | Photo of Route 91 (Jersey Ave) flooded with 2 cars stuck in flood waters between Huron Rd and Corporate Rd in North Brunswick. |
| Jul 15, 6:55 PM EDT | FLOOD | 1 Sw North Brunswick, NJ | Route 91/Jersey Ave. flooded with about a foot between Huron Road and Corporate Road in North Brunswick NJ. Social media picture shows a vehicle stuck in the water with a water assist ongoing. |
| Jul 15, 7:02 PM EDT | FLASH FLOOD | 1 Nw Yardley, PA | Trained Spotter reports impassable roads with water rescues occurring on Taylorsville Road, just off of the I-295 exit. |
| Jul 15, 7:05 PM EDT | FLOOD | Pennington, NJ | NJ Route 31 at Delaware Avenue in Pennington is impassible due to flood waters. Report relayed via NWS Employee. Photo shows about 1 to 2 feet of standing water in the intersection. |
| Jul 15, 7:15 PM EDT | RAIN 2.53 | South River, NJ | Storm total. |
| Jul 15, 7:30 PM EDT | RAIN 3.65 | Washington Crossing, NJ | Storm total. |
| Jul 15, 7:39 PM EDT | RAIN 4.66 | 2 Ese Washington Crossi, NJ | Storm total. |
| Jul 15, 8:53 PM EDT | RAIN 2.69 | Trenton Mercer Airport, NJ | ASOS station KTTN Trenton. |
| Jul 15, 9:00 PM EDT | RAIN 4.64 | Washington Crossing, PA | Mesonet station WASN4 Washington Crossing. |
| Jul 15, 9:15 PM EDT | RAIN 2.88 | 1 Nne Blawenburg, NJ | Mesonet station SKIN4 0.8 NE Blawenburg. |
| Jul 15, 9:30 PM EDT | RAIN 3.61 | 2 W Princeton, NJ | Mesonet station FW0303 Princeton. |
| Jul 15, 9:30 PM EDT | RAIN 3.77 | 1 Ene Sayreville, NJ | Mesonet station DW5872 Sayreville. |
| Jul 15, 9:36 PM EDT | RAIN 4.05 | Lambertville, NJ | Mesonet station FW2229 Lambertville. |
| Jul 15, 9:38 PM EDT | RAIN 2.52 | 1 Ene Skillman, NJ | Mesonet station EW0478 Skillman. |
| Jul 15, 9:39 PM EDT | RAIN 4.4 | 2 Ese Washington Crossi, NJ | Mesonet station GW1897 EWING. |
| Jul 15, 9:40 PM EDT | RAIN 2.04 | 2 Nw West Amwell, NJ | Mesonet station LMBWM 1 NE Lambertville. |
| Jul 15, 9:40 PM EDT | RAIN 2.29 | 1 Wsw Woodsville, NJ | Mesonet station GW1239 Woodsville. |
| Jul 15, 9:40 PM EDT | RAIN 2.8 | 2 Sw Kendall Park, NJ | Mesonet station AV400 Kendall Park. |
| Jul 15, 9:40 PM EDT | RAIN 2.91 | 2 W North Princeton, NJ | Mesonet station PRSCD Princeton (Stuart). |
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, 9.3 hours before the alert went out and 155 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
- 1125 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 596 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.4
The text
As transmitted.
668
WGUS51 KPHI 152118
FFWPHI
NJC019-021-023-035-PAC017-160130-
/O.NEW.KPHI.FF.W.0054.230715T2118Z-230716T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
518 PM EDT Sat Jul 15 2023
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Mercer County in central New Jersey...
Central Middlesex County in northern New Jersey...
Southern Somerset County in northern New Jersey...
Southeastern Hunterdon County in northwestern New Jersey...
East Central Bucks County in southeastern Pennsylvania...
* Until 930 PM EDT.
* At 518 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
2 and 3 inches of rain have fallen. 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...
Trenton, New Brunswick, Somerset, Edison, East Brunswick, South
Brunswick, Sayreville, North Brunswick, Ewing, Princeton,
Pennington, and New Hope.
This includes the following highways...
New Jersey Turnpike between exits 10 and 12.
Interstate 295 in New Jersey between mile markers 70 and 76.
Interstate 287 in New Jersey between mile markers 0 and 4.
Garden State Parkway between mile markers 124 and 132.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4041 7493 4049 7471 4058 7430 4050 7428
4049 7429 4049 7428 4048 7427 4047 7427
4030 7469 4021 7487 4022 7500 4032 7499
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
PO2 follow-up statements
886
WGUS71 KPHI 152301
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
701 PM EDT Sat Jul 15 2023
NJC019-021-023-035-PAC017-160130-
/O.CON.KPHI.FF.W.0054.000000T0000Z-230716T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Middlesex NJ-Somerset NJ-Bucks PA-
701 PM EDT Sat Jul 15 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM EDT THIS
EVENING FOR NORTHWESTERN MERCER, CENTRAL MIDDLESEX, SOUTHERN
SOMERSET, SOUTHEASTERN HUNTERDON, AND EAST CENTRAL BUCKS COUNTIES...
At 701 PM EDT, local law enforcement reported thunderstorms
producing heavy rain in central Middlesex County. Between 2 and 4.5
inches of rain have fallen. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
New Brunswick, Somerset, Edison, East Brunswick, South Brunswick,
Sayreville, North Brunswick, Princeton, Pennington, New Hope,
Hopewell, and Rocky Hill.
This includes the following highways...
New Jersey Turnpike between exits 10 and 12.
Interstate 287 in New Jersey between mile markers 0 and 4.
Garden State Parkway between mile markers 124 and 132.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4041 7493 4049 7471 4058 7430 4050 7428
4049 7429 4049 7428 4047 7427 4030 7469
4035 7484 4025 7495 4021 7493 4022 7500
4032 7499
FLASH FLOOD...OBSERVED
$$
Staarmann641
WGUS71 KPHI 160122
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
922 PM EDT Sat Jul 15 2023
NJC019-021-023-035-PAC017-160132-
/O.EXP.KPHI.FF.W.0054.000000T0000Z-230716T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Middlesex NJ-Somerset NJ-Bucks PA-
922 PM EDT Sat Jul 15 2023
...FLASH FLOOD WARNING WILL EXPIRE AT 930 PM EDT THIS EVENING FOR
NORTHWESTERN MERCER, CENTRAL MIDDLESEX, SOUTHERN SOMERSET,
SOUTHEASTERN HUNTERDON, AND EAST CENTRAL BUCKS COUNTIES...
The heavy rain has ended, and flood waters are receding. Flooding is
no longer expected to pose a threat.
Additional heavy rain is forecast in the area overnight and Sunday.
Remain alert for additional warnings and potential for additional
flooding.
A Flood Watch remains in effect until midnight Sunday night.
LAT...LON 4041 7493 4049 7471 4058 7430 4050 7428
4049 7429 4049 7428 4047 7427 4030 7469
4035 7484 4025 7495 4021 7493 4022 7500
4032 7499
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 8:05 PM EDT | Special Weather Statement | PHI | Morris | 40 min |
| Jul 14, 8:29 PM EDT | Flash Flood Warning | PHI | Morris | 4 hr |
| Jul 14, 9:13 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Somerset, Warren | 3 hr |
| Jul 14, 9:51 PM EDT | Special Weather Statement | PHI | Morris, Somerset | 24 min |
| Jul 14, 9:57 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 41 min |
| Jul 14, 11:32 PM EDT | Special Weather Statement | PHI | Mercer, Monmouth | 28 min |
| Jul 15, 3:44 AM EDT | Flood Watch | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more | 38 hr |
| Jul 15, 1:33 PM EDT | Special Marine Warning | PHI | 57 min | |
| Jul 15, 1:43 PM EDT | Special Weather Statement | PHI | Salem | 32 min |
| Jul 15, 2:56 PM EDT | Special Weather Statement | PHI | Mercer | 34 min |
| Jul 15, 3:08 PM EDT | Special Weather Statement | PHI | Hunterdon | 37 min |
| Jul 15, 3:22 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Somerset | 38 min |
| Jul 15, 3:29 PM EDT | Special Marine Warning | PHI | 61 min | |
| Jul 15, 3:30 PM EDT | Special Weather Statement | PHI | Salem | 30 min |
| Jul 15, 3:40 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 65 min |
| Jul 15, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Somerset | 67 min |
| Jul 15, 4:11 PM EDT | Special Weather Statement | PHI | Gloucester | 34 min |
| Jul 15, 4:31 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer | 106 min |
| Jul 15, 4:52 PM EDT | Special Weather Statement | PHI | Cumberland | 23 min |
| Jul 15, 4:53 PM EDT | Special Weather Statement | PHI | Middlesex | 37 min |
| Jul 15, 5:00 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Middlesex, Somerset | 2 hr |
| Jul 15, 5:12 PM EDT | Severe Thunderstorm Warning | PHI | Mercer, Middlesex | 63 min |
| Jul 15, 5:27 PM EDT | Areal Flood Advisory | PHI | Cumberland, Salem | 99 min |
| Jul 15, 5:45 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 45 min |
| Jul 15, 5:49 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 41 min |
| Jul 15, 6:09 PM EDT | Flash Flood Warning | PHI | Mercer | 4 hr |
| Jul 15, 6:21 PM EDT | Special Weather Statement | PHI | Mercer | 24 min |
| Jul 14, 8:50 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 3 hr |
| Jul 15, 1:46 PM EDT | Special Weather Statement | PHI | Montgomery | 29 min |
| Jul 15, 3:35 PM EDT | Special Weather Statement | PHI | Berks | 25 min |
| Jul 15, 3:51 PM EDT | Special Weather Statement | PHI | Bucks | 24 min |
| Jul 15, 7:46 PM EDT | Special Weather Statement | PHI | Carbon | 29 min |
| Jul 15, 7:53 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 52 min |
Nearby
Flash Flood Warnings in New Jersey, 2023Flash Flood Warnings in Pennsylvania, 2023Every flash flood warning in 2023
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.