Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 65, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 27, 2026, 3:58 PM EDT for Delaware County, Montgomery County, Philadelphia 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 27, 2026, 3:58 PM EDT (19:58 UTC)
- Expired
- Jul 27, 2026, 6:46 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 57 km from the middle of the area, began a volume at 19:59 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
Brookhaven, NY (KOKX), launched 12:00Z, 8.0 hours before the alert went out and 206 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
- 199 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 928 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
236
WGUS51 KPHI 271958
FFWPHI
PAC045-091-101-280000-
/O.NEW.KPHI.FF.W.0065.260727T1958Z-260728T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
358 PM EDT Mon Jul 27 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northeastern Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 800 PM EDT.
* At 358 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...
Philadelphia, Camden, Yeadon, Conshohocken, Hatboro, Ambler,
Jenkintown, Narberth, East Lansdowne, Rockledge, Abington and Bryn
Athyn.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 14 and 19.
Interstate 76 in Pennsylvania between mile markers 330 and 351.
Interstate 95 in Pennsylvania between mile markers 16 and 33.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Pennsylvania Turnpike between mile markers 333 and 346.
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 4014 7501 4012 7498 4011 7496 4010 7496
4008 7496 4008 7497 4006 7498 4005 7498
4002 7503 4001 7505 4000 7506 3996 7513
3989 7514 3994 7531 4006 7536 4022 7515
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MJL1 follow-up statement
099
WGUS71 KPHI 272246
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
646 PM EDT Mon Jul 27 2026
PAC045-091-101-272256-
/O.CAN.KPHI.FF.W.0065.000000T0000Z-260728T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Delaware PA-Montgomery PA-Philadelphia PA-
646 PM EDT Mon Jul 27 2026
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN DELAWARE,
SOUTHEASTERN MONTGOMERY AND PHILADELPHIA COUNTIES...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
&&
LAT...LON 4014 7501 4012 7498 4011 7496 4010 7496
4008 7496 4008 7497 4006 7498 4005 7498
4002 7503 4001 7505 4000 7506 3996 7513
3989 7514 3994 7531 4006 7536 4022 7515
$$
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, 5:25 PM EDT | Flash Flood Warning | PHI | Lehigh | 2 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.