Flash Flood Warning 43, NWS Philadelphia/Mount Holly

Issued

Aug 18, 2021, 11:47 PM EDT (03:47 UTC)

Expired

Aug 19, 2021, 2:09 AM EDT

In force

2 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

County Chester County, PA

The Dover AFB radar (KDOX), 117 km from the middle of the area, began a volume at 03:48 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.

810 
WGUS51 KPHI 190347
FFWPHI
PAC029-190800-
/O.NEW.KPHI.FF.W.0043.210819T0347Z-210819T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1147 PM EDT Wed Aug 18 2021

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  South Central Chester County in southeastern Pennsylvania...

* Until 400 AM EDT.

* At 1147 PM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  2 and 3 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 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 will experience flash flooding include...
  West Chester, Coatesville, Downingtown, Kennett Square, Oxford, 
  West Grove, Ladenberg, Kemblesville, North Star, Marshallton, 
  South Coatesville, and Avondale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3972 7604 4002 7577 3995 7559 3972 7578

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

JEO

758 
WGUS71 KPHI 190538
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
138 AM EDT Thu Aug 19 2021

PAC029-190800-
/O.CON.KPHI.FF.W.0043.000000T0000Z-210819T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
138 AM EDT Thu Aug 19 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 4 AM EDT EARLY THIS 
MORNING FOR SOUTH CENTRAL CHESTER COUNTY...

At 138 AM EDT, local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Road closures and a 
couple of water rescues have been reported in the warned area. 
Between 3 and 6 inches of rain have fallen. Heavy rain has ended, 
but residual flooding will continue. Flash flooding is already 
occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement 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 will experience flash flooding include...
  West Chester, Coatesville, Downingtown, Kennett Square, Oxford, 
  West Grove, Ladenberg, Kemblesville, North Star, Marshallton, 
  South Coatesville, and Avondale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3972 7604 4002 7577 3995 7559 3972 7578

FLASH FLOOD...OBSERVED

$$

JEO

403 
WGUS71 KPHI 190609
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
209 AM EDT Thu Aug 19 2021

PAC029-190619-
/O.CAN.KPHI.FF.W.0043.000000T0000Z-210819T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-
209 AM EDT Thu Aug 19 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL 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 3972 7604 4002 7577 3995 7559 3972 7578

$$

JEO

Flash Flood Warnings in Pennsylvania, 2021Every flash flood warning in 2021

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.