Alert archive / Pennsylvania / Flash Flood Warnings in 2026

Flash Flood Warning 81, NWS Philadelphia/Mount Holly

July 28, 2026Hunterdon County, New Jersey; Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 28, 2026, 7:55 PM EDT for Hunterdon County, New Jersey; Bucks County, Montgomery County, Pennsylvania. It was in force for 4 hr. 3 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: Jul 28, 2026, 7:55 PM EDT (23:55 UTC)
Expired: Jul 29, 2026, 12:00 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Hunterdon County, NJ, Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 95 km from the middle of the area, began a volume at 23:54 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
Jul 28, 8:46 PM EDT	FLASH FLOOD	1 E Red Hill, PA	Water rescue reported near the intersection of Geryville Pike and W Hendricks Rd in Marlborough.
Jul 28, 9:02 PM EDT	FLASH FLOOD	1 Sw Quakertown, PA	Ten residences on the 100 block of Washington Court in Quakertown Borough were evacuated due to basement flooding.
Jul 28, 10:23 PM EDT	RAIN 5.5	1 Ne Frenchtown, NJ

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.9 hours before the alert went out and 214 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1266 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

758 
WGUS51 KPHI 282355
FFWPHI
NJC019-PAC017-091-290400-
/O.NEW.KPHI.FF.W.0081.260728T2355Z-260729T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
755 PM EDT Tue Jul 28 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Central Hunterdon County in northwestern New Jersey...
  Northwestern Bucks County in southeastern Pennsylvania...
  North Central Montgomery County in southeastern Pennsylvania...

* Until midnight EDT tonight.

* At 755 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 1.5 to 2.5 inches 
  in 1 hour. Additional rainfall amounts of 0.5 to 1.5 inches are 
  possible in the warned area. 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...
  Quakertown, Perkasie, Byram, Souderton, Bedminster, Tinicum, 
  Hatfield, East Greenville, Dublin, Frenchtown, Milford and Green 
  Lane.

This includes Northeast Extension between mile markers 31 and 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 4039 7542 4046 7531 4045 7530 4056 7509
      4061 7498 4050 7492 4042 7506 4029 7527
      4024 7536 4039 7558 4040 7557 4044 7554
      4045 7553 4043 7550 4042 7548

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR

$$

AKL

2 follow-up statements

551 
WGUS71 KPHI 290256
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1056 PM EDT Tue Jul 28 2026

NJC019-PAC017-091-290400-
/O.CON.KPHI.FF.W.0081.000000T0000Z-260729T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Bucks PA-Montgomery PA-
1056 PM EDT Tue Jul 28 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT 
FOR CENTRAL HUNTERDON, NORTHWESTERN BUCKS AND NORTH CENTRAL 
MONTGOMERY COUNTIES...

At 1056 PM EDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 2 and 4 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 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...
  Quakertown, Perkasie, Byram, Souderton, Bedminster, Tinicum, 
  Hatfield, East Greenville, Dublin, Frenchtown, Milford and Green 
  Lane.

This includes Northeast Extension between mile markers 31 and 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 4039 7542 4046 7531 4045 7530 4056 7509
      4061 7498 4050 7492 4042 7506 4029 7527
      4024 7536 4039 7558 4040 7557 4044 7554
      4045 7553 4043 7550 4042 7548

FLASH FLOOD...RADAR INDICATED

$$

Hoeflich

005 
WGUS71 KPHI 290355
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1155 PM EDT Tue Jul 28 2026

NJC019-PAC017-091-290405-
/O.EXP.KPHI.FF.W.0081.000000T0000Z-260729T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Bucks PA-Montgomery PA-
1155 PM EDT Tue Jul 28 2026

...FLASH FLOOD WARNING WILL EXPIRE AT MIDNIGHT EDT TONIGHT FOR 
CENTRAL HUNTERDON, NORTHWESTERN BUCKS AND NORTH CENTRAL MONTGOMERY 
COUNTIES...

The heavy rain has ended. Flash flooding is no longer expected to 
pose a widespread threat. Areas of standing water, flooded creeks, 
and flooded streams will continue through the night. A new Flood 
Warning was issued to cover that threat. Refer to that bulletin for 
the updated information. Please continue to heed remaining road 
closures.

A Flood Watch remains in effect until 800 PM EDT Wednesday for 
portions of New Jersey and Pennsylvania.

A Flood Watch remains in effect until 200 PM EDT Wednesday for 
portions of northern Delaware, New Jersey, and Pennsylvania.

&&

LAT...LON 4039 7542 4046 7531 4045 7530 4056 7509
      4061 7498 4050 7492 4042 7506 4029 7527
      4024 7536 4039 7558 4040 7557 4044 7554
      4045 7553 4043 7550 4042 7548

$$

Hoeflich

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 28, 1:22 PM EDT	Severe Thunderstorm Warning	PHI	Warren	38 min
Jul 28, 1:31 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren	44 min
Jul 28, 1:49 PM EDT	Tornado Warning	PHI	Sussex, Warren	26 min
Jul 28, 2:04 PM EDT	Flash Flood Warning	PHI	Warren	10 hr
Jul 28, 2:11 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Somerset	4 hr
Jul 28, 2:15 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	45 min
Jul 28, 2:45 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Warren	9 hr
Jul 28, 2:56 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex	49 min
Jul 28, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	41 min
Jul 28, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	23 min
Jul 28, 4:02 PM EDT	Flash Flood Warning	PHI	Middlesex	2 hr
Jul 28, 5:22 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	34 min
Jul 28, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	43 min
Jul 28, 6:10 PM EDT	Special Marine Warning	PHI		2 hr
Jul 28, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	25 min
Jul 28, 6:17 PM EDT	Flash Flood Warning	PHI	Hunterdon, Warren	6 hr
Jul 28, 6:23 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	67 min
Jul 28, 6:46 PM EDT	Tornado Warning	PHI	Gloucester, Salem	29 min
Jul 28, 6:55 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	50 min
Jul 28, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	54 min
Jul 28, 7:11 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester, Salem	3 hr
Jul 28, 7:23 PM EDT	Special Marine Warning	PHI		2 hr
Jul 28, 7:37 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Salem	23 min
Jul 27, 8:01 PM EDT	Severe Thunderstorm Warning	PHI	Chester	23 min
Jul 28, 1:02 PM EDT	Flash Flood Warning	PHI	Lehigh, Monroe, Northampton	4 hr
Jul 28, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	15 min
Jul 28, 5:29 PM EDT	Severe Thunderstorm Warning	PHI	Chester	61 min
Jul 28, 5:55 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
Jul 28, 6:16 PM EDT	Tornado Warning	PHI	Chester	29 min
Jul 28, 6:56 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Northampton	5 hr
Jul 28, 7:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	35 min
Jul 28, 7:24 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jul 28, 7:31 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	44 min

Nearby

Flash Flood Warnings in Pennsylvania, 2026 Flash Flood Warnings in New Jersey, 2026 Every 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.