Alert archive / Pennsylvania / Flash Flood Warnings in 2025
Flash Flood Warning 44, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 9, 2025, 6:39 PM EDT for Chester County, Pennsylvania. It was in force for 4 hr. 11 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, 6:39 PM EDT (22:39 UTC)
- Expired
- Jul 9, 2025, 10:45 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 120 km from the middle of the area, began a volume at 22:39 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, 7:37 PM EDT | FLASH FLOOD | West Grove, PA | Flooding on Summit Ave at the bottom of the hill is underwater. Time given in report. |
| Jul 9, 8:05 PM EDT | FLASH FLOOD | Coatesville, PA | Car stranded in flooded roadway. Boundary Ct. and Foundry St. |
| Jul 9, 8:25 PM EDT | FLASH FLOOD | Jennersville, PA | Multiple small streams overflowing banks into roadways throughout Jennersville. |
| Jul 9, 8:37 PM EDT | FLASH FLOOD | 1 Sw West Bradford Twp, PA | Broad Run is flowing over Beacon Hill Road at intersection of Broad Run Rd. |
| Jul 9, 8:45 PM EDT | FLASH FLOOD | 2 Ese London Britain Tw, PA | The White Clay Creek at Strickersville rapidly went into flood stage. |
| Jul 9, 8:50 PM EDT | FLASH FLOOD | Caln Twp, PA | Flooding on roadways at Lincoln Hwy and S Bailey Rd. |
| Jul 9, 8:50 PM EDT | FLASH FLOOD | London Grove, PA | Roadway flooding with vehicle stranded on Garden Station Rd. east of Elicott Rd. |
| Jul 9, 9:00 PM EDT | FLASH FLOOD | 1 S Avondale, PA | East Branch White Clay Creek has overflown its banks, flowing over portions of Ellicott Rd shown in pictures. |
| Jul 9, 9:15 PM EDT | FLASH FLOOD | 1 Wsw Kennett Square, PA | The Red Clay Creek at Kennett Square went into flood stage rapidly. |
| Jul 9, 9:15 PM EDT | FLASH FLOOD | New Garden, PA | Flooded roadways at Hillendale Rd. and Scarlett Rd. Vehicle stranded. |
| Jul 9, 10:30 PM EDT | FLASH FLOOD | 2 Ese London Britain Tw, PA | The White Clay Creek at Strickersville went into Major Flood stage. |
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, 10.7 hours before the alert went out and 173 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.
716
WGUS51 KPHI 092239
FFWPHI
PAC029-100245-
/O.NEW.KPHI.FF.W.0044.250709T2239Z-250710T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
639 PM EDT Wed Jul 9 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Chester County in southeastern Pennsylvania...
* Until 1045 PM EDT.
* At 639 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 0.5 inches of rain have
fallen. The expected rainfall rate is 1.5 to 2.5 inches in 1 hour.
Additional rainfall amounts of 1 to 2.5 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...
West Chester, Coatesville, Westtown, Downingtown, Kennett Square,
Oxford, Parkesburg, West Grove, Honey Brook, Cochranville,
Marshallton and Landenberg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 3997 7553 3993 7553 3993 7554 3987 7560
3984 7560 3980 7570 3973 7577 3972 7606
3974 7609 3983 7604 3983 7602 3985 7602
3987 7599 3993 7600 3993 7598 3995 7599
4004 7594 4009 7594 4009 7562 4006 7556
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR
$$
Hoeflich2 follow-up statements
584
WGUS71 KPHI 092348
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
748 PM EDT Wed Jul 9 2025
PAC029-100245-
/O.CON.KPHI.FF.W.0044.000000T0000Z-250710T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
748 PM EDT Wed Jul 9 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT THIS
EVENING FOR CHESTER COUNTY...
At 748 PM EDT, trained weather spotters reported thunderstorms
producing heavy rain in West Grove with roads completely covered in
water. Between 2 and 3 inches of rain have fallen. The expected
rainfall rate is 1.5 to 2.5 inches in 1 hour. Additional rainfall
amounts of 1 to 2.5 inches are possible in the warned area. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
Some locations that may experience flash flooding include...
West Chester, Coatesville, Westtown, Downingtown, Kennett Square,
Oxford, Parkesburg, West Grove, Honey Brook, Cochranville,
Marshallton and Landenberg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3997 7553 3993 7553 3993 7554 3987 7560
3984 7560 3980 7570 3973 7577 3972 7606
3974 7609 3983 7604 3983 7602 3985 7602
3987 7599 3993 7600 3993 7598 3995 7599
4004 7594 4009 7594 4009 7562 4006 7556
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR
$$
Hoeflich261
WGUS71 KPHI 100236
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1036 PM EDT Wed Jul 9 2025
PAC029-100246-
/O.EXP.KPHI.FF.W.0044.000000T0000Z-250710T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
1036 PM EDT Wed Jul 9 2025
...FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM EDT THIS EVENING FOR
CHESTER COUNTY...
Flood waters have receded. The heavy rain has ended. Please continue
to heed remaining road closures. A more targeted Flood Warning was
issued for portions of Chester County as some river gauges remain
above flood stage and road closures have been reported. Please see
that bulletin for updated information.
A Flood Watch remains in effect until 200 AM EDT for a portion of
southeast Pennsylvania.
A Flood Watch remains in effect until 200 AM EDT for portions of
central, northern, and southern Delaware.
&&
LAT...LON 3997 7553 3993 7553 3993 7554 3987 7560
3984 7560 3980 7570 3973 7577 3972 7606
3974 7609 3983 7604 3983 7602 3985 7602
3987 7599 3993 7600 3993 7598 3995 7599
4004 7594 4009 7594 4009 7562 4006 7556
$$
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, 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 |
| Jul 9, 7:47 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 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.