Flash Flood Warning 58, NWS Philadelphia/Mount Holly

Issued

Jul 21, 2026, 3:13 PM EDT (19:13 UTC)

Expired

Jul 21, 2026, 5:59 PM EDT

In force

3 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

Counties Morris County, NJ, Somerset County, NJ

The Philadelphia radar (KDIX), 97 km from the middle of the area, began a volume at 19:15 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.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

795 
WGUS51 KPHI 211913
FFWPHI
NJC027-035-212315-
/O.NEW.KPHI.FF.W.0058.260721T1913Z-260721T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
313 PM EDT Tue Jul 21 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Southeastern Morris County in northern New Jersey...
  North Central Somerset County in northern New Jersey...

* Until 715 PM EDT.

* At 313 PM EDT, Doppler radar 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 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.

  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...
  Morristown, Madison, Florham Park, East Hanover, Morris Plains, 
  Mendham, Peapack And Gladstone, Far Hills, Bernardsville and 
  Hanover Township.

This includes the following highways...
	Interstate 287 in New Jersey between mile markers 31 and 41.
	Interstate 80 in New Jersey between mile markers 45 and 48.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4080 7459 4088 7434 4087 7434 4087 7433
      4086 7432 4085 7433 4084 7433 4083 7433
      4083 7434 4082 7433 4081 7434 4081 7435
      4080 7436 4078 7437 4069 7469 4073 7473

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

Kruzdlo

985 
WGUS71 KPHI 212159
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
559 PM EDT Tue Jul 21 2026

NJC027-035-212209-
/O.CAN.KPHI.FF.W.0058.000000T0000Z-260721T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-
559 PM EDT Tue Jul 21 2026

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN MORRIS AND 
NORTH CENTRAL SOMERSET COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat.

A Flood Watch remains in effect until 200 AM EDT Wednesday for 
portions of northern Delaware, New Jersey, and southeast 
Pennsylvania.

&&

LAT...LON 4080 7459 4088 7434 4087 7434 4087 7433
      4086 7432 4085 7433 4084 7433 4083 7433
      4083 7434 4082 7433 4081 7434 4081 7435
      4080 7436 4078 7437 4069 7469 4073 7473

$$

Kruzdlo

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.