Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 86, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 2, 2026, 11:20 PM EDT for 5 counties in Pennsylvania; Warren County, New Jersey. It was in force for 4 hr. 2 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
- Aug 2, 2026, 11:20 PM EDT (03:20 UTC)
- Expired
- Aug 3, 2026, 3:30 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Warren County, NJ, Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 03:21 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 |
|---|---|---|---|
| Aug 2, 11:22 PM EDT | FLOOD | 2 Se Allentown, PA | Report from mPING: River/Creek overflowing; Cropland/Yard/Basement Flooding. |
| Aug 2, 11:59 PM EDT | RAIN 1.51 | 2 E Plainfield Twp, PA |
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 00:00Z, 3.3 hours before the alert went out and 213 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
- 151 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 507 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 198 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.7
The text
As transmitted.
071
WGUS51 KPHI 030320
FFWPHI
NJC041-PAC011-017-077-091-095-030730-
/O.NEW.KPHI.FF.W.0086.260803T0320Z-260803T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1120 PM EDT Sun Aug 2 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southwestern Warren County in northwestern New Jersey...
East Central Berks County in eastern Pennsylvania...
Eastern Lehigh County in eastern Pennsylvania...
Northampton County in eastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
* Until 330 AM EDT.
* At 1120 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1.5 inches of rain have 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 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...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton,
Quakertown, Wilson, Hellertown, Nazareth, East Greenville and Wind
Gap.
This includes the following highways...
Northeast Extension between mile markers 32 and 60.
Interstate 78 in Pennsylvania between mile markers 54 and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4066 7558 4082 7544 4082 7542 4083 7542
4083 7541 4083 7539 4083 7538 4085 7534
4086 7532 4086 7530 4086 7529 4082 7514
4060 7523 4033 7533 4024 7536 4030 7558
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Cooper2 follow-up statements
774
WGUS71 KPHI 030358
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1158 PM EDT Sun Aug 2 2026
PAC011-091-030408-
/O.CAN.KPHI.FF.W.0086.000000T0000Z-260803T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-Montgomery PA-
1158 PM EDT Sun Aug 2 2026
...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL BERKS AND
NORTHWESTERN MONTGOMERY COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flood Watch remains in effect until 1100 PM EDT Monday for
portions of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4082 7544 4083 7538 4086 7530 4082 7514
4033 7533 4048 7558 4066 7558
$$
NJC041-PAC017-077-095-030730-
/O.CON.KPHI.FF.W.0086.000000T0000Z-260803T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Bucks PA-Lehigh PA-Northampton PA-
1158 PM EDT Sun Aug 2 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM EDT MONDAY FOR
SOUTHWESTERN WARREN, EASTERN LEHIGH, NORTHAMPTON AND NORTHWESTERN
BUCKS COUNTIES...
At 1158 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1.5 inches of rain have fallen. The expected rainfall rate
is 1 to 2 inches in 1 hour. Additional rainfall amounts up to 1 inch
are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
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...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton,
Quakertown, Wilson, Hellertown, Nazareth, Wind Gap and Bath.
This includes the following highways...
Northeast Extension between mile markers 39 and 60.
Interstate 78 in Pennsylvania between mile markers 54 and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4082 7544 4083 7538 4086 7530 4082 7514
4033 7533 4048 7558 4066 7558
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Cooper581
WGUS71 KPHI 030721
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
321 AM EDT Mon Aug 3 2026
NJC041-PAC017-077-095-030731-
/O.EXP.KPHI.FF.W.0086.000000T0000Z-260803T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Bucks PA-Lehigh PA-Northampton PA-
321 AM EDT Mon Aug 3 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 330 AM EDT EARLY THIS MORNING
FOR SOUTHWESTERN WARREN, EASTERN LEHIGH, NORTHAMPTON AND
NORTHWESTERN BUCKS COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flood Watch remains in effect until 1100 PM EDT Monday for
portions of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4082 7544 4083 7538 4086 7530 4082 7514
4033 7533 4048 7558 4066 7558
$$
CooperThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 12:05 AM EDT | Flash Flood Warning | PHI | Bucks, Monroe, Northampton | 3 hr |
| Aug 3, 3:01 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 3 hr |
| Aug 3, 3:05 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 40 min |
| Aug 3, 4:41 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 3, 6:26 AM EDT | Areal Flood Warning | PHI | Bucks, Montgomery | 94 min |
| Aug 3, 7:02 AM EDT | Areal Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| Aug 3, 9:08 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| Aug 3, 10:36 AM EDT | Flash Flood Warning | PHI | Bucks | 6 hr |
| Aug 3, 10:44 AM EDT | Flash Flood Warning | PHI | Bucks, Philadelphia | 6 hr |
| Aug 3, 12:01 PM EDT | Areal Flood Warning | PHI | Bucks | 74 min |
| Aug 3, 1:20 PM EDT | Areal Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 3, 12:36 AM EDT | Special Marine Warning | PHI | 84 min | |
| Aug 3, 2:50 AM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Morris, Somerset | 4 hr |
| Aug 3, 5:59 AM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Aug 3, 8:21 AM EDT | Special Marine Warning | PHI | 69 min | |
| Aug 3, 10:12 AM EDT | Flash Flood Warning | PHI | Atlantic, Cumberland, Salem | 86 min |
| Aug 3, 1:51 PM EDT | Special Marine Warning | PHI | 24 min | |
| Aug 3, 2:53 PM EDT | Special Marine Warning | PHI | 97 min | |
| Aug 3, 2:57 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 27 min |
| Aug 3, 5:15 PM EDT | Special Marine Warning | PHI | 90 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2026Flash Flood Warnings in New Jersey, 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.