Flash Flood Warning 104, NWS Philadelphia/Mount Holly

Issued

Aug 5, 2026, 10:35 PM EDT (02:35 UTC)

Expired

Aug 6, 2026, 1:06 AM EDT

In force

3 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

Counties Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The Philadelphia radar (KDIX), 64 km from the middle of the area, began a volume at 02:36 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.

554 
WGUS51 KPHI 060235
FFWPHI
PAC017-045-091-101-060645-
/O.NEW.KPHI.FF.W.0104.260806T0235Z-260806T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1035 PM EDT Wed Aug 5 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  South Central Bucks County in southeastern Pennsylvania...
  Northeastern Delaware County in southeastern Pennsylvania...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Northern Philadelphia County in southeastern Pennsylvania...

* Until 245 AM EDT.

* At 1035 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 0.5 and 1 inch of rain has 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 heavy rain.

  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, Jenkintown, Narberth, Rockledge, Abington, 
  Langhorne, Bryn Athyn, Willow Grove, Germantown, Chestnut Hill, 
  Northeast Philadelphia and Roxborough.

This includes the following highways...
	Interstate 476 in Pennsylvania between mile markers 9 and 11.
	Interstate 76 in Pennsylvania between mile markers 335 and 340.
	Pennsylvania Turnpike between mile markers 344 and 352.

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.

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 4018 7508 4023 7499 4016 7489 4012 7496
      3997 7526 3995 7530 4001 7537 4003 7533

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

MPS

148 
WGUS71 KPHI 060423
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1223 AM EDT Thu Aug 6 2026

PAC017-045-091-101-060645-
/O.CON.KPHI.FF.W.0104.000000T0000Z-260806T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Delaware PA-Montgomery PA-Philadelphia PA-
1223 AM EDT Thu Aug 6 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM EDT EARLY THIS 
MORNING FOR SOUTH CENTRAL BUCKS, NORTHEASTERN DELAWARE, SOUTHEASTERN 
MONTGOMERY AND NORTHERN PHILADELPHIA COUNTIES...

At 1223 AM EDT, Doppler radar indicated heavy rain across the warned 
area. Between 1 and 2 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 heavy rain.

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, Jenkintown, Narberth, Rockledge, Abington, 
  Langhorne, Bryn Athyn, Willow Grove, Germantown, Chestnut Hill, 
  Northeast Philadelphia and Roxborough.

This includes the following highways...
	Interstate 476 in Pennsylvania between mile markers 9 and 11.
	Interstate 76 in Pennsylvania between mile markers 335 and 340.
	Pennsylvania Turnpike between mile markers 344 and 352.

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.

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 4018 7508 4023 7499 4016 7489 4012 7496
      3997 7526 3995 7530 4001 7537 4003 7533

FLASH FLOOD...RADAR INDICATED

$$

MPS

000 
WGUS71 KPHI 060506
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
106 AM EDT Thu Aug 6 2026

PAC017-045-091-101-060516-
/O.CAN.KPHI.FF.W.0104.000000T0000Z-260806T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Delaware PA-Montgomery PA-Philadelphia PA-
106 AM EDT Thu Aug 6 2026

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL BUCKS, 
NORTHEASTERN DELAWARE, SOUTHEASTERN MONTGOMERY AND NORTHERN 
PHILADELPHIA COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

&&

LAT...LON 4018 7508 4023 7499 4016 7489 4012 7496
      3997 7526 3995 7530 4001 7537 4003 7533

$$

MPS

Flash Flood Warnings in Pennsylvania, 2026Every flash flood warning in 2026

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.