Alert archive / Pennsylvania / Flash Flood Warnings in 2025
Flash Flood Warning 47, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 9, 2025, 7:47 PM EDT for 4 counties in Pennsylvania. It was in force for 4 hr. 5 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 9, 2025, 7:47 PM EDT (23:47 UTC)
- Expired
- Jul 10, 2025, 12:00 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 23:47 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 9, 8:34 PM EDT | FLASH FLOOD | 1 Wsw Bridesburg, PA | Flooding on I-95 southbound between Exit 30: COTTMAN AVE/RHAWN ST and Exit 26: BETSY ROSS BR/ARAMINGO AVE. There is a lane restriction. |
| Jul 9, 8:57 PM EDT | FLASH FLOOD | 1 Wnw Tinicum Twp, PA | Flooding on I-95 southbound between Exit 9B/9A: PA 420 - PROSPECT PARK / ESSINGTON and Exit 8: RIDLEY PARK. There is a lane restriction. |
| Jul 9, 8:58 PM EDT | FLASH FLOOD | 1 Ssw Summerdale, PA | The Frankford Creek went rapidly into flood stage. |
| Jul 9, 9:25 PM EDT | FLASH FLOOD | 1 Sw Shawmont - Philade, PA | Flooding on I-76 eastbound between 1 miles WEST of Exit 338: GREEN LANE/BELMONT AVE and Exit 338: GREEN LANE/BELMONT AVE. There is a lane restriction. |
| Jul 9, 9:25 PM EDT | FLASH FLOOD | 1 W Manayunk, PA | Flooding on I-76 eastbound between 1 miles WEST of Exit 338: GREEN LANE/BELMONT AVE and Exit 338: GREEN LANE/BELMONT AVE. There is a lane restriction. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.8 hours before the alert went out and 217 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
- 647 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 836 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted.
098
WGUS51 KPHI 092347
FFWPHI
PAC029-045-091-101-100400-
/O.NEW.KPHI.FF.W.0047.250709T2347Z-250710T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
747 PM EDT Wed Jul 9 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
East Central Chester County in southeastern Pennsylvania...
Central Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until midnight EDT tonight.
* At 747 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. The expected rainfall rate is 1 to 3 inches in 1 hour.
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...
Philadelphia, Camden, Yeadon, Conshohocken, Palmyra, Folcroft,
Jenkintown, Narberth, National Park, East Lansdowne, Rockledge and
Bryn Athyn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3997 7553 4006 7557 4009 7563 4009 7533
4010 7520 4014 7502 4012 7496 4010 7496
4006 7498 4005 7497 3998 7507 3996 7513
3991 7513 3988 7515 3985 7529 3985 7531
3994 7525 3996 7546 3991 7552 3992 7554
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR
$$
HoeflichThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 9:52 PM EDT | Flood Watch | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more | 26 hr |
| Jul 9, 6:39 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 9, 7:18 PM EDT | Flash Flood Warning | PHI | Delaware | 4 hr |
| Jul 9, 7:24 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 51 min |
| Jul 9, 7:38 PM EDT | Flash Flood Warning | PHI | Delaware | 4 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2025Every flash flood warning in 2025
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.