Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 82, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 28, 2026, 9:03 PM EDT for Berks County, Montgomery County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2026, 9:03 PM EDT (01:03 UTC)
- Expired
- Jul 29, 2026, 12:06 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 01:03 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 1.1 hours before the alert went out and 222 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
- 324 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1059 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
893
WGUS51 KPHI 290103
FFWPHI
PAC011-091-290500-
/O.NEW.KPHI.FF.W.0082.260729T0103Z-260729T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
903 PM EDT Tue Jul 28 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
East Central Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
* Until 100 AM EDT.
* At 903 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 2.5 inches of
rain have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. Additional rainfall amounts up 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...
Collegeville, Trappe, Schwenksville, Bally, Bechtelsville,
Gilbertsville, Spring Mount, Skippack, Boyertown, Pottsgrove,
Sanatoga and Halfway House.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4049 7560 4044 7552 4039 7557 4024 7536
4018 7547 4030 7565 4037 7574
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
AKL2 follow-up statements
540
WGUS71 KPHI 290256 RRA
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1056 PM EDT Tue Jul 28 2026
PAC011-091-290500-
/O.CON.KPHI.FF.W.0082.000000T0000Z-260729T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-
1056 PM EDT Tue Jul 28 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM EDT WEDNESDAY
FOR EAST CENTRAL BERKS AND NORTHWESTERN MONTGOMERY COUNTIES...
At 1056 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. Flooding impacts will continue, but no additional
rainfall is expected. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Collegeville, Trappe, Schwenksville, Bally, Bechtelsville,
Gilbertsville, Spring Mount, Skippack, Boyertown, Pottsgrove,
Sanatoga and Halfway House.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4049 7560 4044 7552 4039 7557 4024 7536
4018 7547 4030 7565 4037 7574
FLASH FLOOD...RADAR INDICATED
$$
Hoeflich752
WGUS71 KPHI 290406
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1206 AM EDT Wed Jul 29 2026
PAC011-091-290416-
/O.CAN.KPHI.FF.W.0082.000000T0000Z-260729T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-
1206 AM EDT Wed Jul 29 2026
...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL BERKS AND
NORTHWESTERN MONTGOMERY COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flood Watch remains in effect until 200 PM EDT Wednesday for
portions of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4049 7560 4044 7552 4039 7557 4024 7536
4018 7547 4030 7565 4037 7574
$$
HoeflichThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 8:10 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 39 min |
| Jul 28, 11:36 PM EDT | Areal Flood Warning | PHI | Bucks, Lehigh, Northampton | 4 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2026Every flash flood warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.