Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 131, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 27, 2026, 1:07 PM EDT for Middlesex County, Somerset County, New Jersey. It was in force for 4 hr. 19 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 27, 2026, 1:07 PM EDT (17:07 UTC)
- Expired
- Aug 27, 2026, 5:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Middlesex County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 17:10 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 27, 1:08 PM EDT | FLASH FLOOD | 1 Ssw Heathcote, NJ | Flooding on US 1 Southbound At Raymond Rd (South Brunswick Twp), 1 right lane of 2 lanes, ramp lane closed. |
| Aug 27, 1:09 PM EDT | FLASH FLOOD | Heathcote, NJ | Flooding on US 1 Southbound At Raymond Rd (South Brunswick Twp), ramp lane closed. |
| Aug 27, 1:16 PM EDT | FLASH FLOOD | 1 Ssw Hopelawn, NJ | Flooding on Garden State Parkway northbound exiting at Exit 125 - Chevalier Avenue (Sayreville) ramp blocked due to flooding. |
| Aug 27, 1:29 PM EDT | FLASH FLOOD | 1 Ssw Hopelawn, NJ | Flooding on US 9 Both Directions South of Edison Bridge (Sayreville), 2 left lanes of 3 lanes, right shoulder closed southbound; 2 right lanes of 3 lanes, right shoulder closed northbound. |
| Aug 27, 1:45 PM EDT | FLASH FLOOD | 1 Nnw Cheesequake, NJ | Flooding on US 9 Northbound North of Poor Farm Rd (Old Bridge Twp), 1 right lane of 3 lanes closed. |
| Aug 27, 1:57 PM EDT | FLASH FLOOD | 1 Ene Parlin, NJ | Social media video showing Several vehicles stalled out on the Garden State Parkway at the 35 route 9 interchange right the exit 125. |
| Aug 27, 2:15 PM EDT | RAIN 2.46 | 2 Ene Spotswood, NJ | Mesonet station ODBN4 2.3 E Spotswood. |
| Aug 27, 2:30 PM EDT | RAIN 3.44 | 1 Ene Sayreville, NJ | Mesonet station DW5872 Sayreville. |
| Aug 27, 3:10 PM EDT | RAIN 2.05 | 2 Nne Dayton, NJ | Mesonet station DEAN4 Deans. |
| Aug 27, 3:15 PM EDT | RAIN 2.48 | 2 Ene Spotswood, NJ | Mesonet station ODBN4 2.3 E Spotswood. |
| Aug 27, 3:15 PM EDT | RAIN 3.47 | 1 Ene Sayreville, NJ | Mesonet station DW5872 Sayreville. |
| Aug 27, 3:20 PM EDT | RAIN 1.48 | 1 Sw Kendall Park, NJ | Mesonet station KNDLL Kendall Park. |
| Aug 27, 3:20 PM EDT | RAIN 2.11 | 2 Sw Kendall Park, NJ | Mesonet station AV400 Kendall Park. |
| Aug 27, 3:30 PM EDT | RAIN 3.47 | 1 Ene Sayreville, NJ | Mesonet station DW5872 Sayreville. |
| Aug 27, 3:40 PM EDT | RAIN 2.11 | 2 Sw Kendall Park, NJ | Mesonet station AV400 Kendall Park. |
| Aug 27, 4:10 PM EDT | RAIN 2.05 | 2 Nne Dayton, NJ | Mesonet station DEAN4 Deans. |
| Aug 27, 4:15 PM EDT | RAIN 2.6 | 2 Ene Spotswood, NJ | Mesonet station ODBN4 2.3 E Spotswood. |
| Aug 27, 4:15 PM EDT | RAIN 3.69 | 1 Ene Sayreville, NJ | Mesonet station DW5872 Sayreville. |
| Aug 27, 4:30 PM EDT | RAIN 2.11 | 2 Sw Kendall Park, NJ | Mesonet station AV400 Kendall Park. |
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, 5.1 hours before the alert went out and 134 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
- 346 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 890 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
863
WGUS51 KPHI 271707
FFWPHI
NJC023-035-272100-
/O.NEW.KPHI.FF.W.0131.260827T1707Z-260827T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
107 PM EDT Thu Aug 27 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Middlesex County in northern New Jersey...
Southeastern Somerset County in northern New Jersey...
* Until 500 PM EDT.
* At 107 PM EDT, Doppler radar 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 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 indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
New Brunswick, Perth Amboy, Somerset, Edison, Old Bridge, East
Brunswick, South Brunswick, Sayreville, North Brunswick, Carteret
and Middlesex.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4039 7465 4049 7468 4059 7446 4061 7431
4059 7429 4060 7422 4059 7420 4056 7422
4055 7425 4052 7425 4050 7426 4050 7428
4049 7429 4049 7427 4046 7426 4044 7426
4031 7449 4035 7463 4038 7462
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
PHI2 follow-up statements
362
WGUS71 KPHI 271738
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
138 PM EDT Thu Aug 27 2026
NJC023-035-272100-
/O.CON.KPHI.FF.W.0131.000000T0000Z-260827T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Somerset NJ-
138 PM EDT Thu Aug 27 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM EDT THIS
AFTERNOON FOR MIDDLESEX AND SOUTHEASTERN SOMERSET COUNTIES...
At 138 PM EDT, local law enforcement reported thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. The expected rainfall rate is 1 to 3 inches in 1 hour.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area. Flash flooding is already occurring in Sayreville and
South Brunswick Township.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Law enforcement reported.
IMPACT...Life threatening flash flooding of creeks and streams, urban
areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
New Brunswick, Perth Amboy, Somerset, Edison, Old Bridge, East
Brunswick, South Brunswick, Sayreville, North Brunswick, Carteret
and Middlesex.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4039 7465 4049 7468 4059 7446 4061 7431
4059 7429 4060 7422 4059 7420 4056 7422
4055 7425 4052 7425 4050 7426 4050 7428
4049 7429 4049 7427 4046 7426 4044 7426
4031 7449 4035 7463 4038 7462
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR
$$
PHI488
WGUS71 KPHI 272059
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
459 PM EDT Thu Aug 27 2026
NJC023-035-272109-
/O.EXP.KPHI.FF.W.0131.000000T0000Z-260827T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Somerset NJ-
459 PM EDT Thu Aug 27 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 5 PM EDT THIS AFTERNOON FOR
MIDDLESEX AND SOUTHEASTERN SOMERSET COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures. An Areal Flood Warning has been issued
to replace the Flash Flood Warning.
A Flood Watch remains in effect until 400 AM EDT Friday for portions
of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4039 7465 4049 7468 4059 7446 4061 7431
4059 7429 4060 7422 4059 7420 4056 7422
4055 7425 4052 7425 4050 7426 4050 7428
4049 7429 4049 7427 4046 7426 4044 7426
4031 7449 4035 7463 4038 7462
$$
PHIThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 11:38 AM EDT | Flash Flood Warning | PHI | Gloucester | 4 hr |
| Aug 27, 12:26 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester | 49 min |
| Aug 27, 12:41 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester, Salem | 5 hr |
| Aug 27, 1:06 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex | 24 min |
| Aug 27, 1:15 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 45 min |
| Aug 27, 1:17 PM EDT | Flash Flood Warning | PHI | Mercer, Somerset | 7 hr |
| Aug 27, 1:20 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 40 min |
| Aug 27, 1:26 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 49 min |
| Aug 27, 1:32 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 43 min |
| Aug 27, 1:34 PM EDT | Special Marine Warning | PHI | 21 min | |
| Aug 27, 1:50 PM EDT | Flash Flood Warning | PHI | Salem | 4 hr |
| Aug 27, 1:57 PM EDT | Tornado Warning | PHI | Salem | 11 min |
| Aug 27, 2:02 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 28 min |
| Aug 27, 2:13 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 47 min |
| Aug 27, 2:16 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 44 min |
| Aug 27, 2:18 PM EDT | Flash Flood Warning | PHI | Middlesex, Monmouth | 4 hr |
| Aug 27, 2:20 PM EDT | Special Marine Warning | PHI | 40 min | |
| Aug 27, 2:31 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 44 min |
| Aug 27, 2:38 PM EDT | Flash Flood Warning | PHI | Camden | 4 hr |
| Aug 27, 2:58 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 30 min |
| Aug 27, 3:00 PM EDT | Special Marine Warning | PHI | 60 min | |
| Aug 27, 3:04 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden | 41 min |
| Aug 27, 3:26 PM EDT | Areal Flood Warning | PHI | Gloucester, Salem | 5 hr |
| Aug 27, 3:43 PM EDT | Flash Flood Warning | PHI | Camden | 3 hr |
| Aug 27, 4:52 PM EDT | Flash Flood Warning | PHI | Warren | 3 hr |
| Aug 27, 4:59 PM EDT | Areal Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Aug 27, 5:44 PM EDT | Areal Flood Warning | PHI | Camden, Gloucester | 5 hr |
| Aug 27, 6:17 PM EDT | Areal Flood Warning | PHI | Middlesex, Monmouth | 4 hr |
| Aug 27, 7:00 PM EDT | Flash Flood Warning | PHI | Burlington, Camden | 3 hr |
| Aug 27, 7:26 PM EDT | Special Marine Warning | PHI | 32 min |
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.