Flash Flood Warning 28, NWS Philadelphia/Mount Holly

Issued

Jul 1, 2025, 3:00 PM EDT (19:00 UTC)

Expired

Jul 1, 2025, 7:00 PM EDT

In force

4 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

County Chester County, PA

The Dover AFB radar (KDOX), 115 km from the middle of the area, began a volume at 19:00 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.

896 
WGUS51 KPHI 011900
FFWPHI
PAC029-012300-
/O.NEW.KPHI.FF.W.0028.250701T1900Z-250701T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
300 PM EDT Tue Jul 1 2025

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Southwestern Chester County in southeastern Pennsylvania...

* Until 700 PM EDT.

* At 300 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 3 inches in 1 
  hour. Additional rainfall amounts of 1 to 3 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...
  Kennett Square, Oxford, West Grove, Kemblesville, Landenberg, 
  North Star, Mount Vernon, Hockessin, Glen Roy, Avondale and 
  Toughkenamon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3989 7567 3987 7560 3985 7560 3981 7569
      3976 7575 3975 7579 3972 7595 3972 7614
      3973 7612 3974 7612 3973 7611 3973 7609
      3975 7610 3976 7608 3976 7606 3980 7604
      3980 7605 3981 7603 3983 7604 3984 7602

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR

$$

Hoeflich

286 
WGUS71 KPHI 012014
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
414 PM EDT Tue Jul 1 2025

PAC029-012300-
/O.CON.KPHI.FF.W.0028.000000T0000Z-250701T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
414 PM EDT Tue Jul 1 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING 
FOR SOUTHWESTERN CHESTER COUNTY...

At 414 PM EDT, trained weather spotters reported thunderstorms 
producing heavy rain and flash flooding on Market Street in Oxford. 
Between 2 and 4 inches of rain have fallen. The expected rainfall 
rate is 1 to 3 inches in 1 hour. Additional rainfall amounts of 1 to 
2 inches are possible in the warned area. Flash flooding is already 
occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Trained spotters reported.

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...
  Kennett Square, Oxford, West Grove, Kemblesville, Landenberg, 
  North Star, Mount Vernon, Hockessin, Glen Roy, Avondale and 
  Toughkenamon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3989 7567 3987 7560 3985 7560 3981 7569
      3976 7575 3975 7579 3972 7595 3972 7614
      3973 7612 3974 7612 3973 7611 3973 7609
      3975 7610 3976 7608 3976 7606 3980 7604
      3980 7605 3981 7603 3983 7604 3984 7602

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR

$$

Hoeflich

586 
WGUS71 KPHI 012252
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
652 PM EDT Tue Jul 1 2025

PAC029-012302-
/O.EXP.KPHI.FF.W.0028.000000T0000Z-250701T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
652 PM EDT Tue Jul 1 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 7 PM EDT THIS EVENING FOR 
SOUTHWESTERN CHESTER COUNTY...

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 3989 7567 3987 7560 3985 7560 3981 7569
      3976 7575 3975 7579 3972 7595 3972 7614
      3973 7612 3974 7612 3973 7611 3973 7609
      3975 7610 3976 7608 3976 7606 3980 7604
      3980 7605 3981 7603 3983 7604 3984 7602

$$

Hoeflich

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

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.