Flash Flood Warning 21, NWS Philadelphia/Mount Holly

Issued

Jun 27, 2023, 12:51 AM EDT (04:51 UTC)

Expired

Jun 27, 2023, 5:00 AM EDT

In force

4 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

Counties Chester County, PA, Montgomery County, PA

The Philadelphia radar (KDIX), 111 km from the middle of the area, began a volume at 04:50 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.

856 
WGUS51 KPHI 270451
FFWPHI
PAC029-091-270900-
/O.NEW.KPHI.FF.W.0021.230627T0451Z-230627T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1251 AM EDT Tue Jun 27 2023

The National Weather Service in Mount Holly has issued a

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

* Until 500 AM EDT.

* At 1251 AM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 and 2.5 inches of rain have fallen. The expected rainfall rate 
  is 0.5 to 1 inch in 1 hour. Additional rainfall amounts of 0.5 to 
  1 inch 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 may experience flash flooding include...
  Phoenixville, Coatesville, Downingtown, Collegeville, Royersford, 
  Trappe, Lionville, Lionville-Marchwood, Glenmoore, Chester 
  Springs, Pughtown, and Spring City.

This includes the following highways...
	Pennsylvania Turnpike between mile markers 307 and 316.

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 3984 7582 3984 7592 3992 7591 4000 7586
      4008 7580 4015 7571 4021 7558 4022 7555
      4018 7542 4017 7540 4001 7569 4000 7570

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR

$$

Staarmann

410 
WGUS71 KPHI 270605
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
205 AM EDT Tue Jun 27 2023

PAC029-091-270900-
/O.CON.KPHI.FF.W.0021.000000T0000Z-230627T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-Montgomery PA-
205 AM EDT Tue Jun 27 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM EDT EARLY THIS 
MORNING FOR CENTRAL CHESTER AND WEST CENTRAL MONTGOMERY COUNTIES...

At 205 AM EDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 
1.5 and 3.5 inches of rain have fallen. 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 may experience flash flooding include...
  Phoenixville, Coatesville, Downingtown, Collegeville, Royersford, 
  Trappe, Lionville, Lionville-Marchwood, Glenmoore, Chester 
  Springs, Pughtown, and Spring City.

This includes the following highways...
	Pennsylvania Turnpike between mile markers 307 and 316.

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 3984 7582 3984 7592 3992 7591 4000 7586
      4008 7580 4015 7571 4021 7558 4022 7555
      4018 7542 4017 7540 4001 7569 4000 7570

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Staarmann

757 
WGUS71 KPHI 270851
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
451 AM EDT Tue Jun 27 2023

PAC029-091-270901-
/O.EXP.KPHI.FF.W.0021.000000T0000Z-230627T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester PA-Montgomery PA-
451 AM EDT Tue Jun 27 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 5 AM EDT EARLY THIS MORNING 
FOR CENTRAL CHESTER AND WEST CENTRAL MONTGOMERY COUNTIES...

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

LAT...LON 3984 7582 3984 7592 3992 7591 4000 7586
      4008 7580 4015 7571 4021 7558 4022 7555
      4018 7542 4017 7540 4001 7569 4000 7570

$$

Staarmann

Flash Flood Warnings in Pennsylvania, 2023Every flash flood warning in 2023

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.