Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 9, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 22, 2026, 6:02 PM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 4 hr. 4 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
- Jun 22, 2026, 6:02 PM EDT (22:02 UTC)
- Expired
- Jun 22, 2026, 10:00 PM EDT
- In force
- 4 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), 79 km from the middle of the area, began a volume at 22:04 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 |
|---|---|---|---|
| Jun 22, 6:05 PM EDT | FLOOD | 1 Wsw Shawmont - Philad, PA | Flooding on Schuylkill Expressway/I-76 west of Gladwyne. Seen on DOT traffic cameras. |
| Jun 22, 6:23 PM EDT | FLASH FLOOD | 1 S Wyncote, PA | Report of a water rescue. |
| Jun 22, 6:30 PM EDT | FLASH FLOOD | 2 Ese Mount Airy, PA | Several public reports via social media and relayed via broadcast media showing flooded streets and fast flowing water at least 6 to 12 inches deep in the Germantown area of Philadelphia. Several cars floating in water. Reports of basements flooded along Godfr |
| Jun 22, 7:09 PM EDT | FLASH FLOOD | 2 Wnw Olney - Philadelp, PA | North Beechwood Street flooded with water almost halfway up the side of multiple cars. Time from report. |
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, 10.0 hours before the alert went out and 217 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1417 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 286 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
350
WGUS51 KPHI 222202
FFWPHI
PAC045-091-101-230100-
/O.NEW.KPHI.FF.W.0009.260622T2202Z-260623T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
602 PM EDT Mon Jun 22 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...
Northwestern Philadelphia County in southeastern Pennsylvania...
* Until 900 PM EDT.
* At 602 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 1.5 inches of
rain have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. Additional rainfall amounts of 0.5 to 1.5 inches are
possible in the warned area. Flash flooding is already occurring.
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, Conshohocken, Jenkintown, Narberth, Chestnut Hill,
Germantown, Plymouth Meeting, Bryn Mawr, Trout Lake, Radnor
Township, King Of Prussia and West Conshohocken.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 10 and 19.
Interstate 76 in Pennsylvania between mile markers 328 and 339.
Pennsylvania Turnpike between mile markers 329 and 330.
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 4011 7530 4014 7514 4003 7508 3999 7537
4005 7539 4006 7537 4007 7536 4007 7537
4007 7538 4006 7539 4007 7540 4008 7540
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MJL3 follow-up statements
059
WGUS51 KPHI 230034
FFWPHI
PAC045-091-101-230200-
/O.EXT.KPHI.FF.W.0009.000000T0000Z-260623T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
834 PM EDT Mon Jun 22 2026
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Northeastern Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Northwestern Philadelphia County in southeastern Pennsylvania...
* Until 1000 PM EDT.
* At 834 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
* Some locations that may experience flash flooding include...
Philadelphia, Conshohocken, Jenkintown, Narberth, Chestnut Hill,
Germantown, Plymouth Meeting, Bryn Mawr, Trout Lake, Radnor
Township, King Of Prussia and West Conshohocken.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 10 and 19.
Interstate 76 in Pennsylvania between mile markers 328 and 339.
Pennsylvania Turnpike between mile markers 329 and 330...and
between mile markers 332 and 334.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4011 7530 4014 7514 4003 7508 3999 7537
4005 7539 4006 7537 4007 7536 4007 7537
4007 7538 4006 7539 4007 7540 4008 7540
FLASH FLOOD...RADAR INDICATED
$$
MJL185
WGUS71 KPHI 230104
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
904 PM EDT Mon Jun 22 2026
PAC045-091-101-230200-
/O.CON.KPHI.FF.W.0009.000000T0000Z-260623T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Delaware PA-Montgomery PA-Philadelphia PA-
904 PM EDT Mon Jun 22 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM EDT THIS
EVENING FOR NORTHEASTERN DELAWARE, SOUTHEASTERN MONTGOMERY AND
NORTHWESTERN PHILADELPHIA COUNTIES...
At 904 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
and 2.5 inches of rain have fallen. Flooding impacts will continue,
but no additional rainfall is expected. Flash flooding is already
occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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, Conshohocken, Jenkintown, Narberth, Chestnut Hill,
Germantown, Plymouth Meeting, Bryn Mawr, Trout Lake, Radnor
Township, King Of Prussia and West Conshohocken.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 10 and 19.
Interstate 76 in Pennsylvania between mile markers 328 and 339.
Pennsylvania Turnpike between mile markers 329 and 330...and
between mile markers 332 and 334.
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.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4011 7530 4014 7514 4003 7508 3999 7537
4005 7539 4006 7537 4007 7536 4007 7537
4007 7538 4006 7539 4007 7540 4008 7540
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Guzzo077
WGUS71 KPHI 230153
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
953 PM EDT Mon Jun 22 2026
PAC045-091-101-230203-
/O.EXP.KPHI.FF.W.0009.000000T0000Z-260623T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Delaware PA-Montgomery PA-Philadelphia PA-
953 PM EDT Mon Jun 22 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM EDT THIS EVENING FOR
NORTHEASTERN DELAWARE, SOUTHEASTERN MONTGOMERY AND NORTHWESTERN
PHILADELPHIA COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flood Watch remains in effect until 600 AM EDT Tuesday for
portions of northern Delaware, New Jersey, and southeast
Pennsylvania.
&&
LAT...LON 4011 7530 4014 7514 4003 7508 3999 7537
4005 7539 4006 7537 4007 7536 4007 7537
4007 7538 4006 7539 4007 7540 4008 7540
$$
GuzzoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 2:13 AM EDT | Flood Watch | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 25 hr |
| Jun 22, 2:20 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 40 min |
| Jun 22, 2:55 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 50 min |
| Jun 22, 4:15 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Delaware, Montgomery | 45 min |
| Jun 22, 4:35 PM EDT | Tornado Warning | PHI | Berks, Chester, Delaware, Montgomery | 25 min |
| Jun 22, 4:56 PM EDT | Tornado Warning | PHI | Chester, Delaware, Montgomery | 34 min |
| Jun 22, 5:18 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 42 min |
| Jun 22, 5:22 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 53 min |
| Jun 22, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 52 min |
| Jun 22, 6:02 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 43 min |
| Jun 22, 6:09 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 51 min |
| Jun 22, 6:26 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 4 hr |
| Jun 22, 6:36 PM EDT | Flash Flood Warning | PHI | Philadelphia | 3 hr |
| Jun 22, 6:48 PM EDT | Flash Flood Warning | PHI | Bucks | 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.