Alert archive / Pennsylvania / Flash Flood Warnings in 2023
Flash Flood Warning 83, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 10, 2023, 6:03 PM EDT for Burlington County, Camden County, New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 3 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
- Sep 10, 2023, 6:03 PM EDT (22:03 UTC)
- Expired
- Sep 10, 2023, 9:00 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Camden County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 22:04 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, 6:19 PM EDT | FLOOD | 1 Nw Eddington, PA | Report from mPING: Street/road flooding; Street/road closed; Vehicles stranded. |
| Sep 10, 6:20 PM EDT | FLOOD | 1 Nnw Holmesburg, PA | Pennypack Creek at Philadelphia gauge PLLP1 reached minor flood stage. |
| Sep 10, 7:51 PM EDT | FLOOD | 1 E Lower Moreland Twp, PA | Road closures due to flooding along Philmont Avenue near Tomlinson Road. |
| Sep 10, 8:00 PM EDT | FLASH FLOOD | 1 N Richmond, PA | Video shared on social media of Kensington Avenue completely flooded. Video indicates sewer system could not handle amount of rainfall seen. |
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, 10.1 hours before the alert went out and 209 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.
579
WGUS51 KPHI 102203
FFWPHI
NJC005-007-PAC017-091-101-110100-
/O.NEW.KPHI.FF.W.0083.230910T2203Z-230911T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
603 PM EDT Sun Sep 10 2023
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Burlington County in southern New Jersey...
Northwestern Camden County in southern New Jersey...
South Central Bucks County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 900 PM EDT.
* At 603 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1.5 inches of
rain have fallen. Additional rainfall amounts up to 0.5 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...
Philadelphia, Camden, Bensalem, Palmyra, Jenkintown, Rockledge,
Abington, Bryn Athyn, Wissinoming, Tacony, Holmesburg, and
Northeast Philadelphia.
This includes the following highways...
Pennsylvania Turnpike between mile markers 346 and 353.
Interstate 95 in Pennsylvania between mile markers 20 and 38.
Interstate 76 in Pennsylvania between mile markers 339 and 344.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey near mile marker 4.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4005 7521 4012 7513 4017 7506 4019 7503
4011 7490 4000 7499 3999 7503 3993 7514
3998 7524
FLASH FLOOD...RADAR INDICATED
$$
MLBThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 5:48 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden | 3 hr |
| Sep 10, 6:07 PM EDT | Special Marine Warning | PHI | 23 min | |
| Sep 10, 7:11 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Warren | 3 hr |
| Sep 10, 7:37 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Mercer, Middlesex, Monmouth | 3 hr |
| Sep 10, 7:55 PM EDT | Flash Flood Warning | PHI | Burlington, Mercer | 3 hr |
| 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 |
Nearby
Flash Flood Warnings in Pennsylvania, 2023Flash Flood Warnings in New Jersey, 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.