Alert archive / Pennsylvania / Flash Flood Warnings in 2024
Flash Flood Warning 42, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 6, 2024, 8:29 PM EDT for Burlington County, New Jersey; 4 counties in Pennsylvania. It was in force for 4 hr. 13 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, 8:29 PM EDT (00:29 UTC)
- Expired
- Aug 7, 2024, 12:03 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 64 km from the middle of the area, began a volume at 00:32 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, 8:42 PM EDT | FLASH FLOOD | 1 Sw Delran, NJ | US 130 at Manor Drive NJ 511 Webcam in Cinnaminson shows flash flooding on roadway. At least one car stuck in flooded waters. |
| Aug 6, 8:45 PM EDT | FLASH FLOOD | Edgewater Park, NJ | Pictures shared on social media of road flooding in Edgewater Park. Time estimated from nearby reports. |
| Aug 6, 9:45 PM EDT | RAIN 2.05 | 2 Ese Tullytown, PA | Mesonet station CW7186 Chesterfield. |
| Aug 6, 9:45 PM EDT | RAIN 2.44 | Lima, PA | Mesonet station GW2214 DES - TEST SITE DELCO. |
| Aug 6, 9:48 PM EDT | RAIN 2.62 | 1 W Bristol, PA | Mesonet station DCBPA Bristol. |
| Aug 6, 9:49 PM EDT | RAIN 2.28 | Bristol, PA | Mesonet station GW0358 Bristol. |
| Aug 6, 9:50 PM EDT | RAIN 2.64 | 1 S Lima, PA | Mesonet station FW3096 Media. |
| Aug 6, 10:00 PM EDT | RAIN 6.01 | New Albany, NJ | PWS station KNJCINNA11 in Cinnaminson Township. |
| Aug 6, 10:00 PM EDT | RAIN 6.88 | 1 Sw Delran, NJ | PWS station KNJRIVER27. |
| Aug 6, 10:15 PM EDT | RAIN 7.03 | 1 Sw Delran, NJ | Updates previous rain report from 1 SW Delran. PWS station KNJRIVER27. |
| Aug 6, 10:30 PM EDT | FLASH FLOOD | Bensalem, PA | Picture on social media of a street flooded in Bensalem. |
| Aug 6, 10:30 PM EDT | RAIN 6.09 | 1 Sse Fairview, NJ | Rainfall total so far in Delran closer to the Moorestown border. |
| Aug 6, 10:40 PM EDT | FLASH FLOOD | Bristol, PA | Multiple reports of flooding in Bristol, including a roof collapse due to the water load. |
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 00:00Z, 0.5 hours before the alert went out and 211 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
- 123 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 553 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.8
The text
As transmitted.
506
WGUS51 KPHI 070029
FFWPHI
NJC005-PAC017-045-091-101-070415-
/O.NEW.KPHI.FF.W.0042.240807T0029Z-240807T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
829 PM EDT Tue Aug 6 2024
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Burlington County in southern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 1215 AM EDT.
* At 829 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms produced heavy rain across the warned area. Between
0.5 and 1.5 inches of rain have fallen. Another round of strong
thunderstorms with rainfall rates 1 to 2 inches per hour is
expected. Additional rainfall amounts of 1 to 3 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...
Philadelphia, Trenton, Camden, Bensalem, Ewing, Norristown,
Chester, Lansdale, West Norriton, East Norriton, Yeadon and
Burlington.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 0 and 19.
Interstate 76 in Pennsylvania between mile markers 330 and 351.
Interstate 95 in Pennsylvania between mile markers 1 and 10...and
between mile markers 12 and 40.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Northeast Extension between mile markers 21 and 28.
Pennsylvania Turnpike between mile markers 329 and 359.
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 4033 7518 4039 7496 4034 7494 4030 7487
4025 7484 4022 7477 4016 7472 4006 7492
3998 7491 4000 7504 3996 7513 3988 7515
3987 7521 3988 7526 3981 7541 3988 7559
3992 7552 3994 7552 4004 7536 4020 7539
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MJL1 follow-up statement
053
WGUS71 KPHI 070403 RRA
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1203 AM EDT Wed Aug 7 2024
NJC005-PAC017-045-091-101-070413-
/O.CAN.KPHI.FF.W.0042.000000T0000Z-240807T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Bucks PA-Delaware PA-Montgomery PA-Philadelphia PA-
1203 AM EDT Wed Aug 7 2024
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BURLINGTON,
SOUTHEASTERN BUCKS, DELAWARE, SOUTHEASTERN MONTGOMERY AND
PHILADELPHIA COUNTIES...
The heavy rain has ended. While the flash flood threat has ended,
flooding remains an issue. A new Flood Warning will be issued.
Please continue to heed remaining road closures.
A Flood Watch remains in effect until 1200 PM EDT Wednesday for
portions of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4033 7518 4039 7496 4034 7494 4030 7487
4025 7484 4022 7477 4016 7472 4006 7492
3998 7491 4000 7504 3996 7513 3988 7515
3987 7521 3988 7526 3981 7541 3988 7559
3992 7552 3994 7552 4004 7536 4020 7539
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 8:49 PM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Aug 6, 9:12 PM EDT | Flash Flood Warning | PHI | Burlington, Camden | 3 hr |
| Aug 6, 9:32 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 27 min |
| Aug 6, 11:37 PM EDT | Areal Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset | 4 hr |
| Aug 7, 12:07 AM EDT | Areal Flood Warning | PHI | Burlington, Camden, Gloucester | 4 hr |
| Aug 7, 12:27 AM EDT | Areal Flood Warning | PHI | Burlington, Mercer, Middlesex, Monmouth | 5 hr |
| Aug 7, 2:29 AM EDT | Flash Flood Warning | PHI | Cape May, Cumberland | 113 min |
| Aug 7, 8:49 AM EDT | Marine Dense Fog Advisory | PHI | 21 hr | |
| Aug 7, 2:09 PM EDT | Gale Watch | PHI | 13 hr | |
| Aug 7, 2:09 PM EDT | Small Craft Advisory | PHI | 40 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2024Flash 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.