Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 94, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 3, 2026, 10:36 AM EDT for 6 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 6 hr. 7 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 3, 2026, 10:36 AM EDT (14:36 UTC)
- Expired
- Aug 3, 2026, 4:45 PM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Somerset County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 14:36 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 3, 10:43 AM EDT | FLASH FLOOD | 1 Wsw North Brunswick, NJ | NJ DOT: Flooding on NJ 91 Both Directions At Huron Rd (North Brunswick Twp), 1 right lane of 2 lanes, right shoulder closed northbound; 1 right lane of 2 lanes, right shoulder closed southbound. |
| Aug 3, 11:21 AM EDT | FLASH FLOOD | 1 Sw North Brunswick, NJ | NJ DOT: Flooding on US 1 Northbound Ramp To NJ 91/Jersey Ave (North Brunswick Twp), ramp lane closed. |
| Aug 3, 12:40 PM EDT | RAIN 2.57 | Bordentown, NJ | |
| Aug 3, 1:05 PM EDT | RAIN 3 | Edison, NJ | Updates previous rain report from Edison. Rainfall total from midnight to 1 PM. |
| Aug 3, 2:13 PM EDT | RAIN 3.56 | South River, NJ | Updates previous rain report from South River. |
| Aug 3, 2:20 PM EDT | RAIN 3.5 | Edison, NJ | Updates previous rain report from Edison. Rainfall total from midnight to 2:20 PM. |
| Aug 3, 2:39 PM EDT | RAIN 3.5 | Edison, NJ | Updates previous rain report from Edison. Rainfall total from midnight to 220 PM. |
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, 2.6 hours before the alert went out and 128 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
- 1129 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 460 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 250 m²/s²
- 0-3 km storm-relative helicity
- 249 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 6.7
The text
As transmitted.
167
WGUS51 KPHI 031436
FFWPHI
NJC005-021-023-025-029-035-PAC017-031845-
/O.NEW.KPHI.FF.W.0094.260803T1436Z-260803T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1036 AM EDT Mon Aug 3 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Mercer County in central New Jersey...
Monmouth County in central New Jersey...
Middlesex County in northern New Jersey...
Southeastern Somerset County in northern New Jersey...
Northeastern Burlington County in southern New Jersey...
Northern Ocean County in southern New Jersey...
Eastern Bucks County in southeastern Pennsylvania...
* Until 245 PM EDT.
* At 1036 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across portions the warned area. Between 1 and 4 inches
of rain have fallen over the last 6 hours with an additional
rainfall amounts up to 2 inches are possible. Rainfall rates have
been around 1-2 inches per hour of accumulation as the line of
showers drifts slowly to the east. 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...
Trenton, New Brunswick, Perth Amboy, Long Branch, Sandy Hook,
Somerset, Edison, Middletown, Old Bridge, East Brunswick, South
Brunswick and Sayreville.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 55 and 76.
New Jersey Turnpike between exits 7 and 13.
Interstate 287 in New Jersey between mile markers 0 and 11.
Interstate 195 in New Jersey between mile markers 0 and 20.
Garden State Parkway between mile markers 107 and 134.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4060 7422 4056 7422 4049 7429 4046 7426
4044 7421 4046 7414 4042 7406 4042 7399
4048 7401 4040 7395 4030 7395 4027 7414
4004 7457 4006 7469 4028 7493 4060 7446
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2 INCHES IN 1 HOUR
$$
Deal3 follow-up statements
644
WGUS71 KPHI 031503
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1103 AM EDT Mon Aug 3 2026
NJC005-021-023-025-029-035-PAC017-031845-
/O.CON.KPHI.FF.W.0094.000000T0000Z-260803T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Mercer NJ-Middlesex NJ-Monmouth NJ-Ocean NJ-
Somerset NJ-Bucks PA-
1103 AM EDT Mon Aug 3 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM EDT THIS
AFTERNOON FOR MERCER, MONMOUTH, MIDDLESEX, SOUTHEASTERN SOMERSET,
NORTHEASTERN BURLINGTON, NORTHERN OCEAN AND EASTERN BUCKS COUNTIES...
At 1103 AM EDT, A combination of NJDOT, automated rain gauges, and
media reports indicated flash flooding is ongoing with extensive
flooding being reported in the Highlands area of NJ and portions of
both North and South Brunswick have reported road closures. Doppler
radar indicated thunderstorms producing heavy rain across portions
of the warned area. Between 1 and 4 inches of rain have fallen
already with additional rainfall of up to 2 inches possible. For the
coastal communities this rainfall is combining with increasing high
tides to produce significant flooding. Flash flooding is already
occurring.
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...
Trenton, New Brunswick, Perth Amboy, Long Branch, Sandy Hook,
Somerset, Edison, Middletown, Old Bridge, East Brunswick, South
Brunswick and Sayreville.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 55 and 76.
New Jersey Turnpike between exits 7 and 13.
Interstate 287 in New Jersey between mile markers 0 and 11.
Interstate 195 in New Jersey between mile markers 0 and 20.
Garden State Parkway between mile markers 106 and 134.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4060 7422 4056 7422 4049 7429 4046 7426
4044 7421 4046 7414 4042 7406 4042 7399
4048 7401 4040 7395 4030 7395 4027 7414
4004 7457 4006 7469 4028 7493 4060 7446
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...2 INCHES IN 1 HOUR
$$
Deal672
WGUS51 KPHI 031843 RRA
FFWPHI
NJC005-021-023-025-029-035-PAC017-032045-
/O.EXT.KPHI.FF.W.0094.000000T0000Z-260803T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
243 PM EDT Mon Aug 3 2026
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Mercer County in central New Jersey...
Monmouth County in central New Jersey...
Middlesex County in northern New Jersey...
Southeastern Somerset County in northern New Jersey...
Northeastern Burlington County in southern New Jersey...
Northern Ocean County in southern New Jersey...
Eastern Bucks County in southeastern Pennsylvania...
* Until 445 PM EDT.
* At 243 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1 and 4 inches of rain have fallen. The expected rainfall rate is
1 inch in 1 hour. Additional rainfall amounts up to 1 inch are
possible in the warned area. Flash flooding is already occurring
and road closures remain ongoing.
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...
Trenton, New Brunswick, Perth Amboy, Long Branch, Sandy Hook,
Somerset, Edison, Middletown, Old Bridge, East Brunswick, South
Brunswick and Sayreville.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 55 and 76.
New Jersey Turnpike between exits 7 and 13.
Interstate 287 in New Jersey between mile markers 0 and 11.
Interstate 195 in New Jersey between mile markers 0 and 20.
Garden State Parkway between mile markers 106 and 134.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4060 7422 4056 7422 4049 7429 4046 7426
4044 7421 4046 7414 4042 7406 4042 7399
4048 7401 4040 7395 4030 7395 4027 7414
4004 7457 4006 7469 4028 7493 4060 7446
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1 INCH IN 1 HOUR
$$
AKL069
WGUS71 KPHI 032041 RRA
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
441 PM EDT Mon Aug 3 2026
NJC005-021-023-025-029-035-PAC017-032051-
/O.EXP.KPHI.FF.W.0094.000000T0000Z-260803T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Mercer NJ-Middlesex NJ-Monmouth NJ-Ocean NJ-
Somerset NJ-Bucks PA-
441 PM EDT Mon Aug 3 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 445 PM EDT THIS AFTERNOON FOR
MERCER, MONMOUTH, MIDDLESEX, SOUTHEASTERN SOMERSET, NORTHEASTERN
BURLINGTON, NORTHERN OCEAN AND EASTERN BUCKS COUNTIES...
The heavy rain has ended and flood waters are recededing. Flooding
is no longer expected to pose a threat. Please continue to heed
remaining road closures.
A Flood Watch remains in effect until 1100 PM EDT Monday for
portions of northern Delaware, New Jersey, and southeast
Pennsylvania.
&&
LAT...LON 4060 7422 4056 7422 4049 7429 4046 7426
4044 7421 4046 7414 4042 7406 4042 7399
4048 7401 4040 7395 4030 7395 4027 7414
4004 7457 4006 7469 4028 7493 4060 7446
$$
AKLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 11:20 PM EDT | Flash Flood Warning | PHI | Warren | 4 hr |
| Aug 3, 12:05 AM EDT | Flash Flood Warning | PHI | Hunterdon, Warren | 3 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, 3:05 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Somerset | 40 min |
| Aug 3, 4:41 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer, Middlesex, Somerset | 2 hr |
| Aug 3, 5:59 AM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Aug 3, 7:02 AM EDT | Areal Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer, Middlesex, Somerset | 3 hr |
| Aug 3, 8:21 AM EDT | Special Marine Warning | PHI | 69 min | |
| Aug 3, 9:08 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer, Salem | 3 hr |
| Aug 3, 10:12 AM EDT | Flash Flood Warning | PHI | Atlantic, Cumberland, Salem | 86 min |
| Aug 3, 10:44 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 6 hr |
| Aug 3, 12:01 PM EDT | Areal Flood Warning | PHI | Mercer | 74 min |
| Aug 3, 1:20 PM EDT | Areal Flood Warning | PHI | Burlington, Camden, Mercer | 4 hr |
| 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 | |
| Aug 3, 3:01 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 3 hr |
| Aug 3, 6:26 AM EDT | Areal Flood Warning | PHI | Bucks, Montgomery | 94 min |
Nearby
Flash Flood Warnings in New Jersey, 2026Flash Flood Warnings in Pennsylvania, 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.