Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 67, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 27, 2026, 5:25 PM EDT for Lehigh County, Pennsylvania. It was in force for 2 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 27, 2026, 5:25 PM EDT (21:25 UTC)
- Expired
- Jul 27, 2026, 7:28 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Lehigh County, PA
The radar
The Philadelphia radar (KDIX), 125 km from the middle of the area, began a volume at 21:25 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 12:00Z, 9.4 hours before the alert went out and 235 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
- 87 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1233 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
181
WGUS51 KPHI 272125
FFWPHI
PAC077-280130-
/O.NEW.KPHI.FF.W.0067.260727T2125Z-260728T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
525 PM EDT Mon Jul 27 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Central Lehigh County in eastern Pennsylvania...
* Until 930 PM EDT.
* At 525 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 1 to 2 inches in 1
hour. 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...
Claussville and Ancient Oaks.
This includes the following highways...
Northeast Extension between mile markers 57 and 58.
Interstate 78 in Pennsylvania between mile markers 45 and 54.
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.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4051 7563 4058 7574 4062 7567 4062 7561
4060 7555
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MJL1 follow-up statement
147
WGUS71 KPHI 272328 RRA
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
728 PM EDT Mon Jul 27 2026
PAC077-272338-
/O.CAN.KPHI.FF.W.0067.000000T0000Z-260728T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lehigh PA-
728 PM EDT Mon Jul 27 2026
...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL LEHIGH COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
&&
LAT...LON 4051 7563 4058 7574 4062 7567 4062 7561
4060 7555
$$
MJLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 2:15 PM EDT | Flood Watch | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 38 hr |
| Jul 27, 2:57 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 48 min |
| Jul 27, 3:01 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 44 min |
| Jul 27, 3:41 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 49 min |
| Jul 27, 3:50 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 40 min |
| Jul 27, 3:58 PM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 3 hr |
| Jul 27, 5:51 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 23 min |
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.