Alert archive / Pennsylvania / Flash Flood Warnings in 2023
Flash Flood Warning 80, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 8, 2023, 5:21 PM EDT for Bucks County, Montgomery County, Pennsylvania; Hunterdon County, New Jersey. It was in force for 4 hr. 3 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 8, 2023, 5:21 PM EDT (21:21 UTC)
- Expired
- Sep 8, 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, Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 77 km from the middle of the area, began a volume at 21:25 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 8, 6:10 PM EDT | FLASH FLOOD | Doylestown, PA | Emergency manager reports flash flooding across the township of Doylestown. Time estimated. |
| Sep 8, 6:10 PM EDT | FLASH FLOOD | Plumstead Twp, PA | Emergency manager reports flash flooding across Plumstead Twp. Time estimated. |
| Sep 8, 6:20 PM EDT | FLASH FLOOD | Buckingham Twp, PA | Emergency manager reports flash flooding across Buckingham Township. Time estimated. |
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, 9.4 hours before the alert went out and 198 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
- 2469 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 566 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.0
The text
As transmitted.
075
WGUS51 KPHI 082121
FFWPHI
NJC019-PAC017-091-090130-
/O.NEW.KPHI.FF.W.0080.230908T2121Z-230909T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
521 PM EDT Fri Sep 8 2023
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Central Hunterdon County in northwestern New Jersey...
Central Bucks County in southeastern Pennsylvania...
Northeastern Montgomery County in southeastern Pennsylvania...
* Until 930 PM EDT.
* At 521 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 of 0.5 to 1.5 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...
Lansdale, Doylestown, Byram, Souderton, Bedminster, Flemington,
Chalfont, Tinicum, Hatfield, Dublin, Frenchtown, and Stockton.
This includes the following highways...
Northeast Extension between mile markers 29 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
&&
LAT...LON 4033 7531 4062 7501 4061 7492 4057 7481
4040 7497 4031 7506 4024 7518 4021 7525
4024 7537
FLASH FLOOD...RADAR INDICATED
$$
MLB4 follow-up statements
377
WGUS71 KPHI 082221
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
621 PM EDT Fri Sep 8 2023
NJC019-PAC017-091-090130-
/O.CON.KPHI.FF.W.0080.000000T0000Z-230909T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Bucks PA-Montgomery PA-
621 PM EDT Fri Sep 8 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM EDT THIS
EVENING FOR CENTRAL HUNTERDON, CENTRAL BUCKS, AND NORTHEASTERN
MONTGOMERY COUNTIES...
At 621 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2.5 inches of rain have
fallen. Additional rainfall amounts up to 0.5 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Lansdale, Doylestown, Byram, Souderton, Bedminster, Flemington,
Chalfont, Tinicum, Hatfield, Dublin, Frenchtown, and Stockton.
This includes the following highways...
Northeast Extension between mile markers 29 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
&&
LAT...LON 4033 7531 4062 7501 4061 7492 4057 7481
4040 7497 4031 7506 4024 7518 4021 7525
4024 7537
FLASH FLOOD...RADAR INDICATED
$$
MLB762
WGUS71 KPHI 082237
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
637 PM EDT Fri Sep 8 2023
NJC019-PAC017-091-090130-
/O.CON.KPHI.FF.W.0080.000000T0000Z-230909T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Bucks PA-Montgomery PA-
637 PM EDT Fri Sep 8 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM EDT THIS
EVENING FOR CENTRAL HUNTERDON, CENTRAL BUCKS, AND NORTHEASTERN
MONTGOMERY COUNTIES...
At 637 PM EDT, emergency management reported flash flooding
occurring across Bucks County. Between 1 and 2.5 inches of rain have
fallen. Additional rainfall amounts up to 0.5 inches are possible in
the warned area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Emergency management 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...
Lansdale, Doylestown, Byram, Souderton, Bedminster, Flemington,
Chalfont, Tinicum, Hatfield, Dublin, Frenchtown, and Stockton.
This includes the following highways...
Northeast Extension between mile markers 29 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
&&
LAT...LON 4033 7531 4062 7501 4061 7492 4057 7481
4040 7497 4031 7506 4024 7518 4021 7525
4024 7537
FLASH FLOOD...OBSERVED
$$
MLB035
WGUS71 KPHI 082326
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
726 PM EDT Fri Sep 8 2023
NJC019-PAC017-091-090130-
/O.CON.KPHI.FF.W.0080.000000T0000Z-230909T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Bucks PA-Montgomery PA-
726 PM EDT Fri Sep 8 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM EDT THIS
EVENING FOR CENTRAL HUNTERDON, CENTRAL BUCKS, AND NORTHEASTERN
MONTGOMERY COUNTIES...
At 726 PM EDT, emergency management reported flash flooding
occurring across Bucks County. Between 1 and 2.5 inches of rain have
fallen. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Emergency management reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Lansdale, Doylestown, Byram, Souderton, Bedminster, Flemington,
Chalfont, Tinicum, Hatfield, Dublin, Frenchtown, and Stockton.
This includes the following highways...
Northeast Extension between mile markers 29 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4033 7531 4062 7501 4061 7492 4057 7481
4040 7497 4031 7506 4024 7518 4021 7525
4024 7537
FLASH FLOOD...OBSERVED
$$
MLB857
WGUS71 KPHI 090122
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
922 PM EDT Fri Sep 8 2023
NJC019-PAC017-091-090132-
/O.EXP.KPHI.FF.W.0080.000000T0000Z-230909T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Bucks PA-Montgomery PA-
922 PM EDT Fri Sep 8 2023
...FLASH FLOOD WARNING WILL EXPIRE AT 930 PM EDT THIS EVENING FOR
CENTRAL HUNTERDON, CENTRAL BUCKS, AND NORTHEASTERN MONTGOMERY
COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Do not drive around barricades.
LAT...LON 4033 7531 4062 7501 4061 7492 4057 7481
4040 7497 4031 7506 4024 7518 4021 7525
4024 7537
$$
MLBThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 8:08 PM EDT | Special Weather Statement | PHI | Chester, Lehigh | 37 min |
| Sep 7, 8:42 PM EDT | Special Weather Statement | PHI | Bucks | 33 min |
| Sep 7, 9:19 PM EDT | Special Weather Statement | PHI | Berks | 26 min |
| Sep 7, 9:37 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 18 min |
| Sep 7, 10:07 PM EDT | Special Weather Statement | PHI | Berks | 38 min |
| Sep 7, 10:38 PM EDT | Areal Flood Advisory | PHI | Berks | 76 min |
| Sep 7, 10:44 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 61 min |
| Sep 8, 4:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 51 min |
| Sep 8, 5:12 PM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Sep 8, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 46 min |
| Sep 8, 5:16 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 3 hr |
| Sep 8, 5:29 PM EDT | Special Weather Statement | PHI | Montgomery | 31 min |
| Sep 8, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 41 min |
| Sep 8, 6:00 PM EDT | Special Weather Statement | PHI | Bucks | 30 min |
| Sep 8, 6:16 PM EDT | Special Weather Statement | PHI | Northampton | 29 min |
| Sep 8, 6:24 PM EDT | Special Weather Statement | PHI | Monroe | 36 min |
| Sep 8, 6:29 PM EDT | Special Weather Statement | PHI | Bucks | 31 min |
| Sep 8, 6:34 PM EDT | Areal Flood Advisory | PHI | Monroe | 3 hr |
| Sep 7, 9:46 PM EDT | Special Weather Statement | PHI | Sussex | 29 min |
| Sep 8, 6:02 AM EDT | Special Marine Warning | PHI | 40 min | |
| Sep 8, 1:36 PM EDT | Special Weather Statement | PHI | Burlington | 24 min |
| Sep 8, 1:37 PM EDT | Special Weather Statement | PHI | Monmouth | 23 min |
| Sep 8, 1:46 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 44 min |
| Sep 8, 1:50 PM EDT | Special Marine Warning | PHI | 115 min | |
| Sep 8, 1:54 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 51 min |
| Sep 8, 2:27 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 48 min |
| Sep 8, 2:30 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Middlesex, Monmouth, Ocean | 45 min |
| Sep 8, 2:33 PM EDT | Areal Flood Advisory | PHI | Burlington, Monmouth, Ocean | 3 hr |
| Sep 8, 2:44 PM EDT | Special Marine Warning | PHI | 18 min | |
| Sep 8, 2:45 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 45 min |
| Sep 8, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Somerset | 52 min |
| Sep 8, 3:17 PM EDT | Special Marine Warning | PHI | 58 min | |
| Sep 8, 3:27 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 63 min |
| Sep 8, 3:29 PM EDT | Flash Flood Warning | PHI | Burlington, Ocean | 4 hr |
| Sep 8, 3:31 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 44 min |
| Sep 8, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 30 min |
| Sep 8, 3:43 PM EDT | Special Weather Statement | PHI | Middlesex | 32 min |
| Sep 8, 3:58 PM EDT | Special Weather Statement | PHI | Somerset | 32 min |
| Sep 8, 4:27 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 51 min |
| Sep 8, 4:30 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 60 min |
| Sep 8, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 40 min |
| Sep 8, 5:49 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 41 min |
| Sep 8, 6:11 PM EDT | Special Weather Statement | PHI | Warren | 34 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.