Alert archive / Delaware / Flash Flood Warnings in 2025

Flash Flood Warning 59, NWS Philadelphia/Mount Holly

July 14, 2025New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 14, 2025, 4:34 PM EDT for New Castle County, Delaware. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 14, 2025, 4:34 PM EDT (20:34 UTC)
Expired: Jul 14, 2025, 8:31 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 83 km from the middle of the area, began a volume at 20:33 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.6 hours before the alert went out and 167 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 732 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 636 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

082 
WGUS51 KPHI 142034
FFWPHI
DEC003-150045-
/O.NEW.KPHI.FF.W.0059.250714T2034Z-250715T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
434 PM EDT Mon Jul 14 2025

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Central New Castle County in northern Delaware...

* Until 845 PM EDT.

* At 434 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 inches of 
  rain have fallen. 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...
  Delaware City, Saint Georges and Port Penn.

This includes the following streams and drainages...
  Augustine Creek BRANDYWINE-CHRISTINA, Red Lion Creek 
  BRANDYWINE-CHRISTINA, Joy Run CHESTER-SASSAFRAS, 
  BRANDYWINE-CHRISTINA, Drawyer Creek BRANDYWINE-CHRISTINA, Saint 
  Georges Creek CHESTER-SASSAFRAS and CHESTER-SASSAFRAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Keep children away from storm drains, culverts, creeks, and streams. 
Water levels can rise rapidly and sweep children away.

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3955 7565 3959 7567 3960 7559 3958 7556
      3951 7557 3950 7569

FLASH FLOOD...RADAR INDICATED

$$

MPS

2 follow-up statements

017 
WGUS71 KPHI 142213
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
613 PM EDT Mon Jul 14 2025

DEC003-150045-
/O.CON.KPHI.FF.W.0059.000000T0000Z-250715T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
613 PM EDT Mon Jul 14 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT THIS 
EVENING FOR CENTRAL NEW CASTLE COUNTY...

At 613 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2.5 and 3.5 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.

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...
  Delaware City, Saint Georges and Port Penn.

This includes the following streams and drainages...
  Augustine Creek BRANDYWINE-CHRISTINA, Red Lion Creek 
  BRANDYWINE-CHRISTINA, Joy Run CHESTER-SASSAFRAS, 
  BRANDYWINE-CHRISTINA, Drawyer Creek BRANDYWINE-CHRISTINA, Saint 
  Georges Creek CHESTER-SASSAFRAS and CHESTER-SASSAFRAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Keep children away from storm drains, culverts, creeks, and streams. 
Water levels can rise rapidly and sweep children away.

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3955 7565 3959 7567 3960 7559 3958 7556
      3951 7557 3950 7569

FLASH FLOOD...RADAR INDICATED

$$

MPS

476 
WGUS71 KPHI 150031
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
831 PM EDT Mon Jul 14 2025

DEC003-150041-
/O.CAN.KPHI.FF.W.0059.000000T0000Z-250715T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
831 PM EDT Mon Jul 14 2025

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL NEW CASTLE COUNTY...

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 200 AM EDT for portions of 
northern Delaware, northeast Maryland, New Jersey, and northeast 
Pennsylvania.

&&

LAT...LON 3955 7565 3959 7567 3960 7559 3958 7556
      3951 7557 3950 7569

$$

MPS

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	31 min
Jul 14, 3:33 PM EDT	Flash Flood Warning	PHI	New Castle	4 hr

Nearby

Flash Flood Warnings in Delaware, 2025 Every flash flood warning in 2025

Sources

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.