Flash Flood Warning 137, NWS Philadelphia/Mount Holly

Issued

Aug 27, 2026, 4:52 PM EDT (20:52 UTC)

Expired

Aug 27, 2026, 7:44 PM EDT

In force

3 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

Counties Warren County, NJ, Northampton County, PA

The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 20:54 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.

246 
WGUS51 KPHI 272052
FFWPHI
NJC041-PAC095-280045-
/O.NEW.KPHI.FF.W.0137.260827T2052Z-260828T0045Z/
/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
452 PM EDT Thu Aug 27 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Southwestern Warren County in northwestern New Jersey...
  Central Northampton County in eastern Pennsylvania...

* Until 845 PM EDT.

* At 452 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...
  Easton, Bethlehem, Forks, Wilson, Washington, Nazareth, Bath,
  Belvidere, Harmony, Oxford, Belfast and West Easton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4068 7518 4063 7536 4075 7547 4085 7505
      4085 7504 4073 7496

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

$$

PHI

759 
WGUS71 KPHI 272231
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
631 PM EDT Thu Aug 27 2026

NJC041-PAC095-280045-
/O.CON.KPHI.FF.W.0137.000000T0000Z-260828T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Northampton PA-
631 PM EDT Thu Aug 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT THIS
EVENING FOR SOUTHWESTERN WARREN AND CENTRAL NORTHAMPTON COUNTIES...

At 631 PM EDT, Doppler radar 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 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...
  Easton, Bethlehem, Forks, Wilson, Washington, Nazareth, Bath,
  Belvidere, Harmony, Oxford, Belfast and West Easton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4068 7518 4063 7536 4075 7547 4085 7505
      4085 7504 4073 7496

FLASH FLOOD...RADAR INDICATED

$$

PHI

529 
WGUS71 KPHI 272344
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
744 PM EDT Thu Aug 27 2026

NJC041-PAC095-272354-
/O.CAN.KPHI.FF.W.0137.000000T0000Z-260828T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren NJ-Northampton PA-
744 PM EDT Thu Aug 27 2026

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN WARREN AND
CENTRAL NORTHAMPTON COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 400 AM EDT Friday for portions
of northern Delaware, New Jersey, and Pennsylvania.

&&

LAT...LON 4068 7518 4063 7536 4075 7547 4085 7505
      4085 7504 4073 7496

$$

PHI

Flash Flood Warnings in New Jersey, 2026Flash Flood Warnings in Pennsylvania, 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.