Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 49, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 18, 2026, 2:36 PM EDT for 4 counties in New Jersey. It was in force for 4 hr. 5 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
- Jul 18, 2026, 2:36 PM EDT (18:36 UTC)
- Expired
- Jul 18, 2026, 6:45 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ
The radar
The Philadelphia radar (KDIX), 49 km from the middle of the area, began a volume at 18:37 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 18, 3:22 PM EDT | FLOOD | Monmouth Hills, NJ | NJDOT reported Flooding on NJ 36 Both Directions At Linden Av (Highlands), All lanes closed eastbound; All lanes closed westbound. |
| Jul 18, 3:22 PM EDT | FLASH FLOOD | Monmouth Hills, NJ | Corrects previous flood report from Monmouth Hills. NJDOT reported Flooding on NJ 36 Both Directions At Linden Av (Highlands), All lanes closed eastbound; All lanes closed westbound. |
| Jul 18, 3:31 PM EDT | FLASH FLOOD | Port Monmouth, NJ | NJDOT reported flooding on NJ 36 Northbound At Wilson Av (Middletown Twp), All lanes closed. |
| Jul 18, 3:54 PM EDT | FLASH FLOOD | 2 Sse Middletown Twp, NJ | NJDOT reported flooding on NJ 35 Northbound South of Oak Hill Rd/Cooper Rd (Middletown Twp), All lanes closed. |
| Jul 18, 4:52 PM EDT | FLASH FLOOD | Atlantic Highlands, NJ | Road flooded in Highlands. Time from report. |
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, 6.6 hours before the alert went out and 145 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
- 5 J/kg
- Mixed-layer CIN
- -238 J/kg
- Mixed-layer LCL
- 1076 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted.
351
WGUS51 KPHI 181836
FFWPHI
NJC019-021-023-025-182245-
/O.NEW.KPHI.FF.W.0049.260718T1836Z-260718T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
236 PM EDT Sat Jul 18 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northeastern Mercer County in central New Jersey...
Northwestern Monmouth County in central New Jersey...
Southwestern Middlesex County in northern New Jersey...
Southeastern Hunterdon County in northwestern New Jersey...
* Until 645 PM EDT.
* At 236 PM EDT, Doppler radar 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 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...
Trenton, Sandy Hook, Middletown, Old Bridge, East Brunswick,
Ewing, Holmdel, Princeton, Red Bank, Keansburg, Matawan and
Jamesburg.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 67 and 76.
New Jersey Turnpike near exit 9.
Garden State Parkway between mile markers 112 and 121.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4036 7479 4035 7476 4041 7428 4045 7422
4044 7421 4046 7414 4040 7398 4048 7401
4044 7398 4038 7388 4024 7483 4030 7487
4034 7494 4039 7496 4041 7479
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Kruzdlo2 follow-up statements
891
WGUS71 KPHI 181906
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
306 PM EDT Sat Jul 18 2026
NJC019-021-023-025-182245-
/O.CON.KPHI.FF.W.0049.000000T0000Z-260718T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Middlesex NJ-Monmouth NJ-
306 PM EDT Sat Jul 18 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM EDT THIS
EVENING FOR NORTHEASTERN MERCER, NORTHWESTERN MONMOUTH, SOUTHWESTERN
MIDDLESEX AND SOUTHEASTERN HUNTERDON COUNTIES...
At 306 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.5 and 2 inches of rain have
fallen. The expected rainfall rate is 1 to 3 inches in 1 hour.
Additional rainfall amounts of 0.5 to 2 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
Some locations that may experience flash flooding include...
Trenton, Sandy Hook, Middletown, Old Bridge, East Brunswick,
Ewing, Holmdel, Princeton, Red Bank, Keansburg, Matawan and
Jamesburg.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 66 and 76.
New Jersey Turnpike near exit 9.
Garden State Parkway between mile markers 112 and 120.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4036 7479 4035 7476 4041 7428 4045 7422
4044 7421 4046 7414 4040 7398 4048 7401
4044 7398 4038 7388 4024 7483 4030 7487
4034 7494 4039 7496 4041 7479
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR
$$
Kruzdlo569
WGUS71 KPHI 182247
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
647 PM EDT Sat Jul 18 2026
NJC019-021-023-025-182257-
/O.EXP.KPHI.FF.W.0049.000000T0000Z-260718T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Middlesex NJ-Monmouth NJ-
647 PM EDT Sat Jul 18 2026
...FLASH FLOOD WARNING HAS EXPIRED FOR NORTHEASTERN MERCER,
NORTHWESTERN MONMOUTH, SOUTHWESTERN MIDDLESEX AND SOUTHEASTERN
HUNTERDON COUNTIES...
This Flash Flood Warning that covered multiple counties has expired.
We are still receiving flooding reports from earlier rain in
Monmouth County and a Flood Warning will issued for this shortly.
A Flood Watch remains in effect until 200 AM EDT Sunday for portions
of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4036 7479 4035 7476 4041 7428 4045 7422
4044 7421 4046 7414 4040 7398 4048 7401
4044 7398 4038 7388 4024 7483 4030 7487
4034 7494 4039 7496 4041 7479
$$
KruzdloThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 10:39 AM EDT | Severe Thunderstorm Warning | PHI | Sussex, Warren | 21 min |
| Jul 18, 12:40 PM EDT | Flash Flood Warning | PHI | Middlesex, Morris, Somerset | 3 hr |
| Jul 18, 1:52 PM EDT | Flash Flood Warning | PHI | Mercer, Middlesex, Somerset | 4 hr |
| Jul 18, 3:13 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 47 min |
| Jul 18, 3:14 PM EDT | Flash Flood Warning | PHI | Mercer | 4 hr |
| Jul 18, 3:16 PM EDT | Special Marine Warning | PHI | 59 min | |
| Jul 18, 3:30 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden | 45 min |
| Jul 18, 3:31 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Monmouth, Ocean | 44 min |
| Jul 18, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 39 min |
| Jul 18, 3:44 PM EDT | Flash Flood Warning | PHI | Middlesex, Monmouth, Ocean | 4 hr |
| Jul 18, 4:02 PM EDT | Special Marine Warning | PHI | 118 min | |
| Jul 18, 4:03 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 42 min |
| Jul 18, 4:34 PM EDT | Flash Flood Warning | PHI | Ocean | 4 hr |
| Jul 18, 4:46 PM EDT | Flash Flood Warning | PHI | Ocean | 4 hr |
| Jul 18, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 61 min |
| Jul 18, 5:16 PM EDT | Special Marine Warning | PHI | 89 min | |
| Jul 18, 5:47 PM EDT | Special Marine Warning | PHI | 118 min | |
| Jul 18, 5:49 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 41 min |
| Jul 18, 6:30 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Jul 18, 6:30 PM EDT | Severe Thunderstorm Warning | PHI | Mercer, Middlesex, Monmouth, Somerset | 45 min |
| Jul 18, 6:55 PM EDT | Areal Flood Warning | PHI | Monmouth | 4 hr |
| Jul 18, 6:56 PM EDT | Special Marine Warning | PHI | 64 min | |
| Jul 18, 7:13 PM EDT | Severe Thunderstorm Warning | PHI | Cape May | 32 min |
| Jul 18, 7:47 PM EDT | Areal Flood Warning | PHI | Monmouth, Ocean | 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.