Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 110, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 7, 2026, 4:24 PM EDT for Monroe County, Northampton County, Pennsylvania; Sussex County, Warren County, New Jersey. It was in force for 4 hr. 1 report 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 7, 2026, 4:24 PM EDT (20:24 UTC)
- Expired
- Aug 7, 2026, 8:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Sussex County, NJ, Warren County, NJ, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 132 km from the middle of the area, began a volume at 20:24 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 7, 4:45 PM EDT | FLASH FLOOD | Blairstown Twp, NJ | Roadway flooding reported in Blairstown Township. Time estimated by radar. |
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, 8.4 hours before the alert went out and 181 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
- 2423 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 685 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
The text
As transmitted.
173
WGUS51 KPHI 072024
FFWPHI
NJC037-041-PAC089-095-080000-
/O.NEW.KPHI.FF.W.0110.260807T2024Z-260808T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
424 PM EDT Fri Aug 7 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
West Central Sussex County in northwestern New Jersey...
Northwestern Warren County in northwestern New Jersey...
Northeastern Northampton County in eastern Pennsylvania...
East Central Monroe County in northeastern Pennsylvania...
* Until 800 PM EDT.
* At 424 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 1.5 to
2.5 inches are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar 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...
Blairstown, Belvidere, Hope, Delaware Water Gap, Millbrook, Echo
Lake, Werry Lake, Columbia, Flatbrookville, Five Points and
Crandon Lakes.
This includes Interstate 80 in New Jersey between mile markers 0 and
14.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4108 7507 4110 7504 4108 7503 4109 7500
4111 7498 4115 7491 4114 7482 4087 7493
4081 7512 4099 7514
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Cooper3 follow-up statements
108
WGUS71 KPHI 072051
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
451 PM EDT Fri Aug 7 2026
NJC037-041-PAC089-095-080000-
/O.CON.KPHI.FF.W.0110.000000T0000Z-260808T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex NJ-Warren NJ-Monroe PA-Northampton PA-
451 PM EDT Fri Aug 7 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING
FOR WEST CENTRAL SUSSEX, NORTHWESTERN WARREN, NORTHEASTERN
NORTHAMPTON AND EAST CENTRAL MONROE COUNTIES...
At 451 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
and 2 inches of rain have fallen. The expected rainfall rate is 1 to
2 inches in 1 hour. Additional rainfall amounts of 1.5 to 2.5 inches
are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
Some locations that may experience flash flooding include...
Blairstown, Belvidere, Hope, Delaware Water Gap, Millbrook, Echo
Lake, Werry Lake, Columbia, Flatbrookville, Five Points and
Crandon Lakes.
This includes Interstate 80 in New Jersey between mile markers 0 and
14.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4108 7507 4110 7504 4108 7503 4109 7500
4111 7498 4115 7491 4114 7482 4087 7493
4081 7512 4099 7514
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Cooper400
WGUS71 KPHI 072201
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
601 PM EDT Fri Aug 7 2026
NJC037-041-PAC089-095-080000-
/O.CON.KPHI.FF.W.0110.000000T0000Z-260808T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex NJ-Warren NJ-Monroe PA-Northampton PA-
601 PM EDT Fri Aug 7 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING
FOR WEST CENTRAL SUSSEX, NORTHWESTERN WARREN, NORTHEASTERN
NORTHAMPTON AND EAST CENTRAL MONROE COUNTIES...
At 601 PM EDT, emergency management reported thunderstorms producing
heavy rain with numerous instances of flash flooding near and along
the Interstate 80 corridor. Between 2.5 and 3.5 inches of rain have
fallen. Additional rainfall amounts up to 0.5 inches are possible in
the warned area. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
Some locations that may experience flash flooding include...
Blairstown, Belvidere, Hope, Delaware Water Gap, Millbrook, Echo
Lake, Werry Lake, Columbia, Flatbrookville, Five Points and
Crandon Lakes.
This includes Interstate 80 in New Jersey between mile markers 0 and
14.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4108 7507 4110 7504 4108 7503 4109 7500
4111 7498 4115 7491 4114 7482 4087 7493
4081 7512 4099 7514
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Cooper486
WGUS71 KPHI 072354
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
754 PM EDT Fri Aug 7 2026
NJC037-041-PAC089-095-080004-
/O.EXP.KPHI.FF.W.0110.000000T0000Z-260808T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex NJ-Warren NJ-Monroe PA-Northampton PA-
754 PM EDT Fri Aug 7 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 8 PM EDT THIS EVENING FOR WEST
CENTRAL SUSSEX, NORTHWESTERN WARREN, NORTHEASTERN NORTHAMPTON AND
EAST CENTRAL MONROE COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
&&
LAT...LON 4108 7507 4110 7504 4108 7503 4109 7500
4111 7498 4115 7491 4114 7482 4087 7493
4081 7512 4099 7514
$$
CooperThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 2:38 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 50 min |
| Aug 7, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 67 min |
| Aug 7, 2:58 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 62 min |
| Aug 7, 3:16 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 44 min |
| Aug 7, 3:25 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 7, 3:25 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 65 min |
| Aug 7, 3:37 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 3 hr |
| Aug 7, 4:04 PM EDT | Flash Flood Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 2 hr |
| Aug 7, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Monroe, Northampton | 54 min |
| Aug 7, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 55 min |
| Aug 7, 4:56 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 64 min |
| Aug 7, 5:01 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 3 hr |
| Aug 7, 5:01 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 44 min |
| Aug 7, 5:34 PM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Aug 7, 7:19 PM EDT | Areal Flood Warning | PHI | Monroe, Northampton | 4 hr |
| Aug 7, 4:42 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 25 min |
| Aug 7, 4:43 PM EDT | Special Marine Warning | PHI | 48 min | |
| Aug 7, 4:56 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Sussex, Warren | 3 hr |
| Aug 7, 5:18 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Somerset, Sussex | 3 hr |
| Aug 7, 5:40 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset | 50 min |
| Aug 7, 5:42 PM EDT | Flash Flood Warning | PHI | Mercer, Middlesex, Morris, Somerset | 3 hr |
| Aug 7, 5:45 PM EDT | Special Marine Warning | PHI | 60 min | |
| Aug 7, 5:48 PM EDT | Special Marine Warning | PHI | 57 min | |
| Aug 7, 6:37 PM EDT | Special Marine Warning | PHI | 53 min | |
| Aug 7, 6:39 PM EDT | Flash Flood Warning | PHI | Monmouth | 3 hr |
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.