Alert archive / Pennsylvania / Flash Flood Warnings in 2025
Flash Flood Warning 31, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 1, 2025, 4:55 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 4 hr. 10 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 1, 2025, 4:55 PM EDT (20:55 UTC)
- Expired
- Jul 1, 2025, 9:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 123 km from the middle of the area, began a volume at 20:56 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 1, 5:02 PM EDT | FLASH FLOOD | Wernersville, PA | Flooding occurring in Wernersville. |
| Jul 1, 5:04 PM EDT | FLASH FLOOD | 1 N Lorane, PA | Vehicle stuck in flood water under a railroad underpass on Gibraltar Road. |
| Jul 1, 5:05 PM EDT | FLASH FLOOD | Alleghenyville, PA | Vehicle stuck in flood water at the intersection of Maple Grove Road & Kramer Road. |
| Jul 1, 5:09 PM EDT | FLASH FLOOD | 2 Wsw Robeson Twp, PA | Vehicle stuck in 4 feet of water on Westley Road. |
| Jul 1, 5:21 PM EDT | FLASH FLOOD | Muhlenberg Twp, PA | Vehicle stuck in water on Route 61. |
| Jul 1, 6:00 PM EDT | FLASH FLOOD | 3 Sw Earl Twp, PA | The Manatawny Creek at Spangville (SPGP1) rapidly rose into flood stage. |
| Jul 1, 6:11 PM EDT | FLASH FLOOD | Muhlenberg Twp, PA | The road is washed out at the intersection of Frush Valley Road and Mt Laurel Road. |
| Jul 1, 6:31 PM EDT | FLASH FLOOD | Muhlenburg, PA | Water Street flooded in Muhlenburg. |
| Jul 1, 6:45 PM EDT | RAIN 2.7 | Douglassville, PA | Rainfall from 4:30 PM to 6:00 PM. |
| Jul 1, 7:47 PM EDT | FLASH FLOOD | Robeson Twp, PA | Part of Moyer Road collapsed due to flash flooding. |
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, 8.9 hours before the alert went out and 203 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
- 822 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 994 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
694
WGUS51 KPHI 012055
FFWPHI
PAC011-029-091-020100-
/O.NEW.KPHI.FF.W.0031.250701T2055Z-250702T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
455 PM EDT Tue Jul 1 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southeastern Berks County in eastern Pennsylvania...
North Central Chester County in southeastern Pennsylvania...
West Central Montgomery County in southeastern Pennsylvania...
* Until 900 PM EDT.
* At 455 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. The expected rainfall rate is 0.5 to 1.5 inches in 1
hour. Additional rainfall amounts of 0.5 to 1 inch 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...
Reading, Pottstown, Phoenixville, Wyomissing, Birdsboro,
Royersford, Sinking Spring, Laureldale, Wernersville, Elverson,
New Morgan and Cedarville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4036 7576 4031 7557 4026 7548 4015 7551
4014 7587 4014 7588 4032 7615 4040 7602
4043 7593
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.5-1.5 INCHES IN 1 HOUR
$$
Hoeflich2 follow-up statements
535
WGUS71 KPHI 012121
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
521 PM EDT Tue Jul 1 2025
PAC011-029-091-020100-
/O.CON.KPHI.FF.W.0031.000000T0000Z-250702T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Chester PA-Montgomery PA-
521 PM EDT Tue Jul 1 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 PM EDT THIS EVENING
FOR SOUTHEASTERN BERKS, NORTH CENTRAL CHESTER AND WEST CENTRAL
MONTGOMERY COUNTIES...
At 521 PM EDT, local law enforcement reported thunderstorms
producing heavy rain. At Westley Road in Mohnton, a water rescue was
reported. Between 2 and 3 inches of rain have fallen. The expected
rainfall rate is 0.75 to 1.5 inches in 1 hour. Additional rainfall
amounts of 0.5 to 1 inch are possible in the warned area. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Reading, Pottstown, Phoenixville, Wyomissing, Birdsboro,
Royersford, Sinking Spring, Laureldale, Wernersville, Elverson,
New Morgan and Cedarville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4036 7576 4031 7557 4026 7548 4015 7551
4014 7587 4014 7588 4032 7615 4040 7602
4043 7593
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.75-1.5 INCHES IN 1 HOUR
$$
Hoeflich720
WGUS71 KPHI 020056
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
856 PM EDT Tue Jul 1 2025
PAC011-029-091-020106-
/O.EXP.KPHI.FF.W.0031.000000T0000Z-250702T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Chester PA-Montgomery PA-
856 PM EDT Tue Jul 1 2025
...FLASH FLOOD WARNING WILL EXPIRE AT 9 PM EDT THIS EVENING FOR
SOUTHEASTERN BERKS, NORTH CENTRAL CHESTER AND WEST CENTRAL
MONTGOMERY COUNTIES...
Flash Flooding is no longer expected to pose a threat. Please
continue to heed remaining road closures. A more targeted Flood
Warning was just issued for the Reading area. Please refer to that
bulletin for the updated information.
&&
LAT...LON 4036 7576 4031 7557 4026 7548 4015 7551
4014 7587 4014 7588 4032 7615 4040 7602
4043 7593
$$
HoeflichThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 11:20 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Jun 30, 11:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Delaware, Montgomery | 43 min |
| Jul 1, 12:38 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 36 min |
| Jul 1, 2:30 AM EDT | Flood Watch | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 19 hr |
| Jul 1, 6:15 AM EDT | River Flood Warning | PHI | Chester | 3 hr |
| Jul 1, 6:21 AM EDT | Areal Flood Warning | PHI | Delaware | 2 hr |
| Jul 1, 2:32 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 43 min |
| Jul 1, 2:58 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 47 min |
| Jul 1, 3:00 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 1, 3:06 PM EDT | River Flood Warning | PHI | Chester, Delaware | 8 hr |
| Jul 1, 3:31 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 4 hr |
| Jul 1, 3:34 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 56 min |
| Jul 1, 3:39 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 66 min |
| Jul 1, 4:27 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Lehigh, Montgomery | 63 min |
| Jul 1, 4:44 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 1, 4:47 PM EDT | Tornado Warning | PHI | Berks, Montgomery | 28 min |
| Jul 1, 5:07 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 38 min |
| Jul 1, 5:14 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 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.