Alert archive / New Jersey / Flash Flood Warnings in 2024
Flash Flood Warning 56, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 9, 2024, 5:30 PM EDT for Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 83 min. 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 9, 2024, 5:30 PM EDT (21:30 UTC)
- Expired
- Aug 9, 2024, 6:53 PM EDT
- In force
- 83 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Mercer County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 39 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.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.5 hours before the alert went out and 173 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
- 988 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 536 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 245 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 13.0
The text
As transmitted.
285
WGUS51 KPHI 092130
FFWPHI
NJC021-PAC017-100030-
/O.NEW.KPHI.FF.W.0056.240809T2130Z-240810T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
530 PM EDT Fri Aug 9 2024
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Central Mercer County in central New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
* Until 830 PM EDT.
* At 530 PM EDT, Doppler radar indicated heavy rain across the
warned area. Up to 1 inch of rain has fallen. The expected
rainfall rate is 1 to 2 inches in 1 hour. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
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...
Trenton, Ewing, Burlington, Bristol, Hightstown, Tullytown,
Langhorne, White Horse, Mercerville-Hamilton Square,
Florence-Roebling, Levittown and Edinburg.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 58 and 68.
Interstate 195 in New Jersey between mile markers 0 and 4.
Interstate 95 in Pennsylvania between mile markers 39 and 40.
Pennsylvania Turnpike between mile markers 355 and 359.
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 4035 7463 4032 7462 4029 7456 4028 7450
4018 7469 4018 7471 4016 7471 4013 7474
4012 7479 4013 7482 4010 7484 4008 7487
4016 7495 4027 7475
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MJL1 follow-up statement
165
WGUS71 KPHI 092253
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
653 PM EDT Fri Aug 9 2024
NJC021-PAC017-092303-
/O.CAN.KPHI.FF.W.0056.000000T0000Z-240810T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-
653 PM EDT Fri Aug 9 2024
...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL MERCER AND
SOUTHEASTERN BUCKS COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
&&
LAT...LON 4035 7463 4032 7462 4029 7456 4028 7450
4018 7469 4018 7471 4016 7471 4013 7474
4012 7479 4013 7482 4010 7484 4008 7487
4016 7495 4027 7475
$$
MJLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 3:31 PM EDT | Flash Flood Warning | PHI | Warren | 108 min |
| Aug 9, 4:11 PM EDT | Flash Flood Warning | PHI | Warren | 100 min |
| Aug 8, 8:52 PM EDT | Flash Flood Warning | PHI | Berks, Chester | 3 hr |
| Aug 8, 9:06 PM EDT | River Flood Warning | PHI | Chester | 9 hr |
| Aug 8, 11:40 PM EDT | Areal Flood Warning | PHI | Chester | 4 hr |
| Aug 9, 12:12 AM EDT | River Flood Warning | PHI | Chester, Delaware | 16 hr |
| Aug 9, 2:50 PM EDT | Flash Flood Warning | PHI | Lehigh, Northampton | 2 hr |
| Aug 9, 3:50 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 2 hr |
| Aug 9, 5:56 PM EDT | River Flood Warning | PHI | Chester | 6 hr |
| Aug 9, 6:46 PM EDT | Areal Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 4 hr |
Nearby
Flash Flood Warnings in New Jersey, 2024Flash Flood Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.