Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 72, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 28, 2026, 2:04 PM EDT for Warren County, New Jersey. It was in force for 10 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
- Jul 28, 2026, 2:04 PM EDT (18:04 UTC)
- Expired
- Jul 28, 2026, 11:45 PM EDT
- In force
- 10 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Warren County, NJ
The radar
The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 18:06 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, 9:00 PM EDT | RAIN 4.73 | Stewartsville, 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, 6.1 hours before the alert went out and 188 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
- 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
The text
As transmitted.
820
WGUS51 KPHI 281804
FFWPHI
NJC041-282215-
/O.NEW.KPHI.FF.W.0072.260728T1804Z-260728T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
204 PM EDT Tue Jul 28 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southwestern Warren County in northwestern New Jersey...
* Until 615 PM EDT.
* At 204 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across portions of the warned area. Between 0.5 and 1.5
inches of rain have fallen. The expected rainfall rate is 1.5 to 3
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...
Washington, Belvidere, Harmony, Oxford, Alpha, Roxburg, Brass
Castle, Pleasant Valley and Phillipsburg.
This includes Interstate 78 in New Jersey between mile markers 3 and
5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4064 7514 4070 7519 4086 7503 4079 7495
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-3 INCHES IN 1 HOUR
$$
Kruzdlo5 follow-up statements
968
WGUS71 KPHI 281916
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
316 PM EDT Tue Jul 28 2026
NJC041-282215-
/O.CON.KPHI.FF.W.0072.000000T0000Z-260728T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-
316 PM EDT Tue Jul 28 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM EDT THIS
EVENING FOR SOUTHWESTERN WARREN COUNTY...
At 316 PM EDT, storm spotters reported flooding in Washington
Borough. Flooding was occurring on State Route 57. All lanes were
being impacted by water. In addition, the right lane was flooded on
NJ-31.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Washington, Belvidere, Harmony, Oxford, Alpha, Roxburg, Brass
Castle, Pleasant Valley and Phillipsburg.
This includes Interstate 78 in New Jersey between mile markers 3 and
5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4064 7514 4070 7519 4086 7503 4079 7495
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-3 INCHES IN 1 HOUR
$$
Kruzdlo980
WGUS51 KPHI 282211
FFWPHI
NJC041-290015-
/O.EXT.KPHI.FF.W.0072.000000T0000Z-260729T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
611 PM EDT Tue Jul 28 2026
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Southwestern Warren County in northwestern New Jersey...
* Until 815 PM EDT.
* At 611 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 3 and 4.5 inches of
rain have fallen over the last 5 hours. 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
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...
Washington, Belvidere, Harmony, Oxford, Alpha, Roxburg, Brass
Castle, Pleasant Valley and Phillipsburg.
This includes Interstate 78 in New Jersey between mile markers 3 and
5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4064 7514 4070 7519 4086 7503 4079 7495
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
AKL213
WGUS51 KPHI 290012 RRA
FFWPHI
NJC041-290145-
/O.EXT.KPHI.FF.W.0072.000000T0000Z-260729T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
812 PM EDT Tue Jul 28 2026
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Southwestern Warren County in northwestern New Jersey...
* Until 945 PM EDT.
* At 812 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 3 and 4.5 inches of
rain have fallen over the last 6 hours. The expected rainfall rate
is 1 to 2 inches in 1 hour. Additional rainfall amounts of 0.5 to
1.5 inches are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
* Some locations that may experience flash flooding include...
Washington, Belvidere, Harmony, Oxford, Alpha, Roxburg, Brass
Castle, Pleasant Valley and Phillipsburg.
This includes Interstate 78 in New Jersey between mile markers 3 and
5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4064 7514 4070 7519 4086 7503 4079 7495
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
AKL831
WGUS51 KPHI 290143 RRA
FFWPHI
NJC041-290345-
/O.EXT.KPHI.FF.W.0072.000000T0000Z-260729T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
943 PM EDT Tue Jul 28 2026
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Southwestern Warren County in northwestern New Jersey...
* Until 1145 PM EDT.
* At 943 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 3 and 4.5 inches of
rain have fallen. 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...
Washington, Belvidere, Harmony, Oxford, Alpha, Roxburg, Brass
Castle, Pleasant Valley and Phillipsburg.
This includes Interstate 78 in New Jersey between mile markers 3 and
5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4064 7514 4070 7519 4086 7503 4079 7495
FLASH FLOOD...RADAR INDICATED
$$
AKL499 WGUS71 KPHI 290337 FFSPHI Flash Flood Statement National Weather Service Mount Holly NJ 1137 PM EDT Tue Jul 28 2026 NJC041-290347- /O.EXP.KPHI.FF.W.0072.000000T0000Z-260729T0345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren NJ- 1137 PM EDT Tue Jul 28 2026 ...FLASH FLOOD WARNING WILL EXPIRE AT 1145 PM EDT THIS EVENING FOR SOUTHWESTERN WARREN COUNTY... The heavy rain has ended. Flash flooding is no longer expected to pose a widespread threat. Areas of standing water, flooded creeks, and flooded streams will continue through the night. A new Flood Warning was issued to cover that threat. Refer to that bulletin for the updated information. Please continue to heed remaining road closures. A Flood Watch remains in effect until 800 PM EDT Wednesday for portions of New Jersey and Pennsylvania. && LAT...LON 4064 7514 4070 7519 4086 7503 4079 7495 $$ 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, 2:11 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 28, 7:55 PM EDT | Flash Flood Warning | PHI | Hunterdon | 4 hr |
Nearby
Flash 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.