Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 141, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 27, 2026, 9:21 PM EDT for Berks 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
- Aug 27, 2026, 9:21 PM EDT (01:21 UTC)
- Expired
- Aug 28, 2026, 12:50 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Berks County, PA
The radar
The State College radar (KCCX), 150 km from the middle of the area, began a volume at 01:23 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 1.4 hours before the alert went out and 194 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
- 1155 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1287 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.3
The text
As transmitted.
802
WGUS51 KPHI 280121
FFWPHI
PAC011-280515-
/O.NEW.KPHI.FF.W.0141.260828T0121Z-260828T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
921 PM EDT Thu Aug 27 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
West Central Berks County in eastern Pennsylvania...
* Until 115 AM EDT.
* At 921 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 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 indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Mainly rural areas of West Central Berks County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4049 7643 4052 7634 4051 7633 4052 7631
4051 7630 4052 7627 4052 7623 4039 7626
4041 7630
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
PHI1 follow-up statement
171
WGUS71 KPHI 280450
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
1250 AM EDT Fri Aug 28 2026
PAC011-280500-
/O.CAN.KPHI.FF.W.0141.000000T0000Z-260828T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
1250 AM EDT Fri Aug 28 2026
...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL BERKS COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 400 AM EDT for portions of New
Jersey and Pennsylvania.
&&
LAT...LON 4051 7638 4052 7634 4051 7633 4052 7632
4052 7631 4051 7630 4052 7628 4052 7626
4052 7624 4052 7623 4039 7626 4041 7630
4049 7643
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 8:09 PM EDT | Areal Flood Warning | PHI | Bucks, Montgomery | 5 hr |
| Aug 27, 8:16 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Aug 27, 8:40 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 50 min |
| Aug 27, 9:09 PM EDT | Areal Flood Warning | PHI | Bucks, Chester, Montgomery | 4 hr |
| Aug 27, 9:32 PM EDT | River Flood Warning | PHI | Bucks | 6 hr |
| Aug 27, 10:22 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 38 min |
| Aug 27, 10:36 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 3 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.