Flash Flood Warning 113, NWS Philadelphia/Mount Holly

Issued

Aug 7, 2026, 5:18 PM EDT (21:18 UTC)

Expired

Aug 7, 2026, 8:15 PM EDT

In force

3 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ

The Philadelphia radar (KDIX), 101 km from the middle of the area, began a volume at 21:19 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.

176 
WGUS51 KPHI 072118
FFWPHI
NJC019-027-035-037-080015-
/O.NEW.KPHI.FF.W.0113.260807T2118Z-260808T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
518 PM EDT Fri Aug 7 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Central Morris County in northern New Jersey...
  Northwestern Somerset County in northern New Jersey...
  Northeastern Hunterdon County in northwestern New Jersey...
  South Central Sussex County in northwestern New Jersey...

* Until 815 PM EDT.

* At 518 PM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  0.5 and 1 inch of rain has fallen. The expected rainfall rate is 
  1.5 to 2.5 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...
  Dover, Hopatcong, Wharton, Rockaway, Mount Arlington, Mendham, 
  Stanhope, Netcong, Peapack And Gladstone, Chester, Victory Gardens 
  and Lebanon.

This includes the following highways...
	Interstate 287 in New Jersey between mile markers 22 and 27.
	Interstate 78 in New Jersey between mile markers 20 and 30.
	Interstate 80 in New Jersey between mile markers 23 and 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 4075 7485 4090 7478 4091 7478 4091 7477
      4092 7477 4100 7474 4096 7444 4074 7455
      4065 7459 4061 7486

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR

$$

Cooper

758 
WGUS71 KPHI 072223
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
623 PM EDT Fri Aug 7 2026

NJC019-027-035-037-080015-
/O.CON.KPHI.FF.W.0113.000000T0000Z-260808T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Morris NJ-Somerset NJ-Sussex NJ-
623 PM EDT Fri Aug 7 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT THIS 
EVENING FOR CENTRAL MORRIS, NORTHWESTERN SOMERSET, NORTHEASTERN 
HUNTERDON AND SOUTH CENTRAL SUSSEX COUNTIES...

At 623 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. Additional rainfall amounts up to 
0.5 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...
  Dover, Hopatcong, Wharton, Rockaway, Mount Arlington, Mendham, 
  Stanhope, Netcong, Peapack And Gladstone, Chester, Victory Gardens 
  and Lebanon.

This includes the following highways...
	Interstate 287 in New Jersey between mile markers 22 and 26.
	Interstate 78 in New Jersey between mile markers 20 and 31.
	Interstate 80 in New Jersey between mile markers 23 and 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 4075 7485 4090 7478 4091 7478 4091 7477
      4092 7477 4100 7474 4096 7444 4074 7455
      4065 7459 4061 7486

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Cooper

849 
WGUS71 KPHI 080006
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
806 PM EDT Fri Aug 7 2026

NJC019-027-035-037-080016-
/O.EXP.KPHI.FF.W.0113.000000T0000Z-260808T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Morris NJ-Somerset NJ-Sussex NJ-
806 PM EDT Fri Aug 7 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM EDT THIS EVENING FOR 
CENTRAL MORRIS, NORTHWESTERN SOMERSET, NORTHEASTERN HUNTERDON AND 
SOUTH CENTRAL SUSSEX 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 4075 7485 4090 7478 4091 7478 4091 7477
      4092 7477 4100 7474 4096 7444 4074 7455
      4065 7459 4061 7486

$$

Cooper

Flash Flood Warnings in New Jersey, 2026Every flash flood warning in 2026

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.