Alert archive / Pennsylvania / Flash Flood Warnings in 2019

Flash Flood Warning 69, NWS Philadelphia/Mount Holly

July 31, 2019Burlington County, New Jersey; Bucks County, Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 31, 2019, 1:19 PM EDT for Burlington County, New Jersey; Bucks County, Delaware County, Philadelphia County, Pennsylvania. It was in force for 5 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 31, 2019, 1:19 PM EDT (17:19 UTC)
Expired: Jul 31, 2019, 6:15 PM EDT
In force: 5 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Burlington County, NJ, Bucks County, PA, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 17:19 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.

What was reported inside it

Time	Report	Where	Remark
Jul 31, 1:34 PM EDT	FLASH FLOOD	Lansdowne, PA	REPORTS OF A WATER RESCUE.
Jul 31, 4:30 PM EDT	FLASH FLOOD	Pennypack Creek At Phil, PA	PENNYPACK CREEK AT PHILADELPHIA EXCEEDED FLOOD STAGE OF 7 FEET.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.3 hours before the alert went out and 213 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: 885 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1207 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

768 
WGUS51 KPHI 311719
FFWPHI
NJC005-PAC017-045-101-312015-
/O.NEW.KPHI.FF.W.0069.190731T1719Z-190731T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
119 PM EDT Wed Jul 31 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northwestern Burlington County in southern New Jersey...
  South central Bucks County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  East central Delaware County in southeastern Pennsylvania...

* Until 415 PM EDT.

* At 119 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to one inch of rain has
  already fallen. Flash flooding is expected to begin shortly in the
  areas of heaviest rain.

* Some locations that could experience flooding include...
  Philadelphia, Camden, Bensalem, Willingboro, Yeadon, Burlington,
  Bristol, Riverside, Palmyra, Folcroft, Swarthmore, East Lansdowne,
  Beverly, Wissinoming, Feasterville-Trevose, Darby Township, Morris
  Park, Tacony, Kensington and Roxborough.

This includes Interstate 295 in New Jersey between mile markers 49
and 50.
 
LAT...LON 4007 7478 3998 7501 4000 7504 3997 7511
      3993 7514 3986 7531 3993 7541 3999 7529
      3998 7527 4001 7521 4003 7523 4007 7515
      4005 7510 4010 7507 4017 7496

$$

NC

2 follow-up statements

085 
WGUS51 KPHI 312007
FFWPHI
NJC005-PAC017-045-101-312215-
/O.EXT.KPHI.FF.W.0069.000000T0000Z-190731T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
407 PM EDT Wed Jul 31 2019

The National Weather Service in Mount Holly NJ has extended the

* Flash Flood Warning for...
  Northwestern Burlington County in southern New Jersey...
  South central Bucks County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  East central Delaware County in southeastern Pennsylvania...

* Until 615 PM EDT.

* At 405 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 1-2 inches of rain has already 
  fallen. Flash flooding is already occurring.

* Some locations that could experience flooding include...
  Philadelphia, Camden, Bensalem, Willingboro, Yeadon, Burlington,
  Bristol, Riverside, Palmyra, Folcroft, Swarthmore, East Lansdowne,
  Beverly, Wissinoming, Feasterville-Trevose, Darby Township, Morris
  Park, Tacony, Kensington and Roxborough.

This includes Interstate 295 in New Jersey between mile markers 49
and 50.
 
LAT...LON 4007 7478 3998 7501 4000 7504 3997 7511
      3993 7514 3986 7531 3993 7541 3999 7529
      3998 7527 4001 7521 4003 7523 4007 7515
      4005 7510 4010 7507 4017 7496

$$

NC

603 
WGUS71 KPHI 312206
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
606 PM EDT Wed Jul 31 2019

NJC005-PAC017-045-101-312216-
/O.EXP.KPHI.FF.W.0069.000000T0000Z-190731T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Bucks PA-Philadelphia PA-Delaware PA-
606 PM EDT Wed Jul 31 2019

...THE FLASH FLOOD WARNING FOR NORTHWESTERN BURLINGTON...SOUTH
CENTRAL BUCKS...PHILADELPHIA AND EAST CENTRAL DELAWARE COUNTIES WILL
EXPIRE AT 615 PM EDT...

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

LAT...LON 4007 7478 3998 7501 4000 7504 3997 7511
      3993 7514 3986 7531 3993 7541 3999 7529
      3998 7527 4001 7521 4003 7523 4007 7515
      4005 7510 4010 7507 4017 7496

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 3:28 AM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 4 more	17 hr
Jul 31, 1:02 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	28 min
Jul 31, 1:14 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	3 hr
Jul 31, 1:30 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer	45 min
Jul 31, 1:43 PM EDT	Special Marine Warning	PHI		62 min
Jul 31, 1:46 PM EDT	Flash Flood Warning	PHI	Burlington, Mercer	3 hr
Jul 31, 1:49 PM EDT	Special Marine Warning	PHI		86 min
Jul 31, 1:57 PM EDT	Special Weather Statement	PHI	Ocean	33 min
Jul 31, 2:11 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	49 min
Jul 31, 2:21 PM EDT	Areal Flood Advisory	PHI	Ocean	4 hr
Jul 31, 2:23 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	52 min
Jul 31, 2:29 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	46 min
Jul 31, 2:29 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	46 min
Jul 31, 2:32 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 1 more	3 hr
Jul 31, 2:46 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	44 min
Jul 31, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	52 min
Jul 31, 3:00 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	3 hr
Jul 31, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	40 min
Jul 31, 3:06 PM EDT	Special Marine Warning	PHI		54 min
Jul 31, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	40 min
Jul 31, 3:24 PM EDT	Flash Flood Warning	PHI	Monmouth	4 hr
Jul 31, 3:24 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	51 min
Jul 31, 3:39 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	4 hr
Jul 31, 3:39 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	51 min
Jul 31, 3:48 PM EDT	Flash Flood Warning	PHI	Ocean	2 hr
Jul 31, 3:49 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer, Monmouth	41 min
Jul 31, 3:51 PM EDT	Special Marine Warning	PHI		54 min
Jul 31, 3:58 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	17 min
Jul 31, 4:36 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	4 hr
Jul 31, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	38 min
Jul 31, 4:58 PM EDT	Flash Flood Warning	PHI	Sussex, Warren	4 hr
Jul 31, 5:02 PM EDT	Special Weather Statement	PHI	Atlantic	28 min
Jul 31, 5:16 PM EDT	Special Weather Statement	PHI	Atlantic	44 min
Jul 31, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cumberland, Ocean, Salem	48 min
Jul 31, 5:41 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	3 hr
Jul 31, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	25 min
Jul 31, 5:51 PM EDT	Special Marine Warning	PHI		54 min
Jul 31, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	35 min
Jul 31, 5:57 PM EDT	Special Marine Warning	PHI		63 min
Jul 31, 6:05 PM EDT	Special Marine Warning	PHI		55 min
Jul 31, 6:41 PM EDT	Special Marine Warning	PHI		64 min
Jul 31, 6:53 PM EDT	Special Marine Warning	PHI		54 min
Jul 31, 7:36 PM EDT	Special Marine Warning	PHI		54 min
Jul 30, 10:45 PM EDT	Special Weather Statement	PHI	Berks	45 min
Jul 30, 11:38 PM EDT	Special Weather Statement	PHI	Lehigh	52 min
Jul 31, 12:06 AM EDT	Special Weather Statement	PHI	Carbon	39 min
Jul 31, 2:27 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	3 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2019 Flash Flood Warnings in New Jersey, 2019 Every flash flood warning in 2019

Sources

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.