Alert archive / Pennsylvania / Flash Flood Warnings in 2023
Flash Flood Warning 71, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 25, 2023, 1:20 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 5 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
- Jul 25, 2023, 1:20 PM EDT (17:20 UTC)
- Expired
- Jul 25, 2023, 6:00 PM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 100 km from the middle of the area, began a volume at 17:23 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 |
|---|---|---|---|
| Jul 25, 3:00 PM EDT | FLASH FLOOD | 1 Nnw Green Lane, PA | Several photos of several roads completely impassible with a creek overflowing its banks near McLean Station Rd in Red Hill. Time estimated. |
| Jul 25, 4:13 PM EDT | FLOOD | 2 Sw Trumbauersville, PA | Photo of Trumbauersville Rd flooded near I-476 in Trumbauersville. |
| Jul 25, 4:53 PM EDT | FLOOD | 2 Ssw Trumbauersville, PA | Photo of Wright Road near Trumbauersville shows water over-running the roadway. |
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, 5.3 hours before the alert went out and 224 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
- 231 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 960 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
178
WGUS51 KPHI 251720
FFWPHI
PAC017-091-252000-
/O.NEW.KPHI.FF.W.0071.230725T1720Z-230725T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
120 PM EDT Tue Jul 25 2023
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
West Central Bucks County in southeastern Pennsylvania...
North Central Montgomery County in southeastern Pennsylvania...
* Until 400 PM EDT.
* At 120 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 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...
Quakertown, Perkasie, Green Lane, Pennsburg, Red Hill, and
Trumbauersville.
This includes the following highways...
Northeast Extension between mile markers 38 and 43.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4037 7553 4041 7547 4046 7538 4039 7528
4031 7547
FLASH FLOOD...RADAR INDICATED
$$
RCM2 follow-up statements
461
WGUS51 KPHI 251938
FFWPHI
PAC017-091-252200-
/O.EXT.KPHI.FF.W.0071.000000T0000Z-230725T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
338 PM EDT Tue Jul 25 2023
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
West Central Bucks County in southeastern Pennsylvania...
North Central Montgomery County in southeastern Pennsylvania...
* Until 600 PM EDT.
* At 338 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
* Some locations that may experience flash flooding include...
Quakertown, Perkasie, Green Lane, Pennsburg, Red Hill, and
Trumbauersville.
This includes the following highways...
Northeast Extension between mile markers 38 and 43.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4037 7553 4041 7547 4046 7538 4039 7528
4031 7547
FLASH FLOOD...RADAR INDICATED
$$
RCM483
WGUS71 KPHI 252154
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
554 PM EDT Tue Jul 25 2023
PAC017-091-252204-
/O.EXP.KPHI.FF.W.0071.000000T0000Z-230725T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Montgomery PA-
554 PM EDT Tue Jul 25 2023
...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM EDT THIS EVENING FOR WEST
CENTRAL BUCKS AND NORTH CENTRAL MONTGOMERY COUNTIES...
The heavy rain has ended and flood waters have receded.Flooding is
no longer expected to pose a threat.
LAT...LON 4037 7553 4041 7547 4046 7538 4039 7528
4031 7547
$$
RobertsonThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 11:58 AM EDT | Special Weather Statement | PHI | Montgomery | 32 min |
| Jul 25, 12:07 PM EDT | Special Weather Statement | PHI | Berks | 23 min |
| Jul 25, 12:16 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Montgomery | 44 min |
| Jul 25, 12:31 PM EDT | Special Weather Statement | PHI | Berks | 29 min |
| Jul 25, 12:33 PM EDT | Special Weather Statement | PHI | Berks | 27 min |
| Jul 25, 12:37 PM EDT | Special Weather Statement | PHI | Carbon | 38 min |
| Jul 25, 12:47 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery | 33 min |
| Jul 25, 12:56 PM EDT | Special Weather Statement | PHI | Northampton | 34 min |
| Jul 25, 1:00 PM EDT | Special Weather Statement | PHI | Berks | 30 min |
| Jul 25, 1:03 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 42 min |
| Jul 25, 1:06 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 39 min |
| Jul 25, 1:10 PM EDT | Special Weather Statement | PHI | Delaware | 35 min |
| Jul 25, 1:12 PM EDT | Special Weather Statement | PHI | Monroe | 33 min |
| Jul 25, 1:27 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Jul 25, 1:27 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 48 min |
| Jul 25, 1:37 PM EDT | Areal Flood Advisory | PHI | Carbon | 3 hr |
| Jul 25, 1:38 PM EDT | Flash Flood Warning | PHI | Delaware | 4 hr |
| Jul 25, 1:41 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 3 hr |
| Jul 25, 1:42 PM EDT | Special Weather Statement | PHI | Philadelphia | 33 min |
| Jul 25, 1:49 PM EDT | Special Weather Statement | PHI | Chester | 26 min |
| Jul 25, 1:54 PM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 4 hr |
| Jul 25, 1:55 PM EDT | Areal Flood Advisory | PHI | Monroe | 2 hr |
| Jul 25, 2:06 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 39 min |
| Jul 25, 2:14 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 46 min |
| Jul 25, 2:21 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 2 hr |
| Jul 25, 2:36 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery, Philadelphia | 39 min |
| Jul 25, 2:51 PM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 3 hr |
| Jul 25, 2:57 PM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Jul 25, 3:06 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Montgomery | 95 min |
| Jul 25, 3:13 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 25, 3:16 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 44 min |
| Jul 25, 3:21 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 39 min |
| Jul 25, 3:34 PM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 3 hr |
| Jul 25, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 30 min |
| Jul 25, 4:04 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jul 25, 4:55 PM EDT | Flash Flood Warning | PHI | Chester | 118 min |
| Jul 25, 5:07 PM EDT | River Flood Warning | PHI | Chester | 6 hr |
Nearby
Flash 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.