Alert archive / New Jersey / Flash Flood Warnings in 2023
Flash Flood Warning 84, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 10, 2023, 7:55 PM EDT for Bucks County, Pennsylvania; Burlington County, Mercer County, New Jersey. It was in force for 3 hr. 2 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 10, 2023, 7:55 PM EDT (23:55 UTC)
- Expired
- Sep 10, 2023, 11:00 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Mercer County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 35 km from the middle of the area, began a volume at 23:55 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 10, 9:20 PM EDT | FLASH FLOOD | 1 Wnw Eastampton Twp, NJ | Knightsbridge Road in Eastampton Township was closed due to flooding. |
| Sep 10, 9:26 PM EDT | FLOOD | Bensalem, PA | Trained spotter reports Poquessing Creek overflowing its banks on social media. |
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, 11.9 hours before the alert went out and 176 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
- 1034 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 789 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.9
The text
As transmitted.
534
WGUS51 KPHI 102355
FFWPHI
NJC005-021-PAC017-110400-
/O.NEW.KPHI.FF.W.0084.230910T2355Z-230911T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
755 PM EDT Sun Sep 10 2023
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southern Mercer County in central New Jersey...
Northwestern Burlington County in southern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
* Until midnight EDT.
* At 755 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1.5 inches of rain have fallen. The expected rainfall rate
is 1 to 3 inches in 1 hour. Additional rainfall amounts up 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...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...
Philadelphia, Trenton, Ewing, Willingboro, Florence, Burlington,
Bristol, Mount Holly, Riverside, Bordentown, Beverly, and Yardley.
This includes the following highways...
New Jersey Turnpike between exits 5 and 8.
Pennsylvania Turnpike between mile markers 354 and 359.
Interstate 95 in Pennsylvania between mile markers 35 and 40.
Interstate 295 in New Jersey between mile markers 45 and 66...and
between mile markers 75 and 76.
Interstate 195 in New Jersey between mile markers 0 and 7.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4014 7493 4023 7490 4029 7481 4024 7457
4018 7459 4018 7460 4019 7460 4018 7461
4017 7461 4016 7460 4008 7463 3998 7477
4004 7498
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR
$$
MLB1 follow-up statement
051
WGUS71 KPHI 110300
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1100 PM EDT Sun Sep 10 2023
NJC005-021-PAC017-110310-
/O.CAN.KPHI.FF.W.0084.000000T0000Z-230911T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Mercer NJ-Bucks PA-
1100 PM EDT Sun Sep 10 2023
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHERN MERCER,
NORTHWESTERN BURLINGTON, AND SOUTHEASTERN BUCKS COUNTIES...
Flood waters are receding. The heavy rain has ended. Flooding is no
longer expected to pose a threat.
LAT...LON 4014 7493 4023 7490 4029 7481 4024 7457
4018 7459 4018 7460 4019 7460 4018 7461
4017 7461 4016 7460 4008 7463 3998 7477
4004 7498
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 8:09 PM EDT | Areal Flood Advisory | PHI | Berks | 20 min |
| Sep 9, 8:29 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Sep 9, 9:12 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe | 116 min |
| Sep 10, 5:48 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Philadelphia | 3 hr |
| Sep 10, 6:03 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 3 hr |
| Sep 10, 7:11 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 3 hr |
| Sep 10, 7:37 PM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Sep 10, 9:37 AM EDT | Special Weather Statement | PHI | Atlantic | 53 min |
| Sep 10, 10:14 AM EDT | Areal Flood Advisory | PHI | Mercer, Middlesex, Somerset | 107 min |
| Sep 10, 11:37 AM EDT | Areal Flood Advisory | PHI | Monmouth | 85 min |
| Sep 10, 6:07 PM EDT | Special Marine Warning | PHI | 23 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.