Alert archive / Pennsylvania / Flash Flood Warnings in 2018

Flash Flood Warning 94, NWS Philadelphia/Mount Holly

September 7, 2018Delaware County, Philadelphia County, Pennsylvania; Camden County, Gloucester County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 7, 2018, 6:41 PM EDT for Delaware County, Philadelphia County, Pennsylvania; Camden County, Gloucester County, New Jersey. It was in force for 4 hr. 17 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: Sep 7, 2018, 6:41 PM EDT (22:41 UTC)
Expired: Sep 7, 2018, 10:45 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Camden County, NJ, Gloucester County, NJ, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 22:42 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
Sep 7, 6:52 PM EDT	FLOOD	1 Ne South Philadelphia, PA	FLOODING ON INTERSTATE 76 NEAR EXIT 347. LANE RESTRICTIONS IN PLACE.
Sep 7, 6:58 PM EDT	FLASH FLOOD	1 Wsw Westville, NJ	FLASH FLOODING ON I-295 IN BOTH DIRECTIONS AT EXIT 23. SOME LANES ARE CLOSED.
Sep 7, 7:15 PM EDT	FLASH FLOOD	Westville, NJ	ALL LANES CLOSED ON NJ 45 SOUTHBOUND AT US 130 DUE TO FLASH FLOODING.
Sep 7, 7:18 PM EDT	FLASH FLOOD	Westville, NJ	ALL LANES CLOSED ON US 130 SOUTHBOUND APPROACHING NJ 45 DUE TO FLASH FLOODING.
Sep 7, 7:30 PM EDT	FLASH FLOOD	1 Se Westville, NJ	SEVERAL LANE CLOSURES ON INTERSTATE 295 NEAR THE INTERSTATE 76/676 INTERCHANGE...WHICH HAVE LASTED FOR SEVERAL HOURS. ADDITIONALLY...ROUTE 42 WAS FLOODED NEAR THE INTERSTATE 295 INTERCHANGE.
Sep 7, 7:30 PM EDT	FLASH FLOOD	1 Sw Bellmawr, NJ	WIDESPREAD FLOODING ON THE NEW JERSEY TURNPIKE IN DEPTFORD TOWNSHIP. MULTIPLE LANES CLOSED.
Sep 7, 7:35 PM EDT	HEAVY RAIN 2.4	Deptford, NJ	RAINFALL WITHIN 45 MINUTES.
Sep 7, 7:40 PM EDT	FLOOD	2 Ese South Philadelphi, PA	SEVERAL REPORTS OF FLOODING ON INTERSTATE 95...ESPECIALLY NEAR PHILADELPHIA INTERNATIONAL AIRPORT AND EXIT 17. FLOODING ALSO REPORTED ON STATE HIGHWAY 611. SEVERAL LANE RESTRICTIONS WERE IN PLACE.
Sep 7, 7:54 PM EDT	HEAVY RAIN 3.4	Philadelphia Intl Airpo, PA	2.66 INCHES OF RAIN FELL IN JUST 38 MINUTES.
Sep 7, 7:56 PM EDT	FLOOD	1 Se Gloucester City, NJ	FLOODING ON U.S. HIGHWAY 130 NEAR MARKET STREET. SEVERAL LANES CLOSED.
Sep 7, 8:00 PM EDT	FLASH FLOOD	Camden, NJ	RIVER LINE SERVICE SUSPENDED IN BOTH DIRECTIONS BETWEEN THE WALTER RAND TRANSPORTATION CENTER AND THE WATERFRONT ENTERTAINMENT COMPLEX DUE TO FLASH FLOODING.
Sep 7, 8:00 PM EDT	HEAVY RAIN 3.03	West Deptford, NJ
Sep 7, 8:00 PM EDT	HEAVY RAIN 4.19	1 Nnw Woodbury, NJ
Sep 7, 8:02 PM EDT	FLASH FLOOD	1 E Ridley Twp, PA	WATER RESCUE ON LINCOLN AVENUE NEAR PROSPECT PARK STATION.
Sep 7, 8:45 PM EDT	HEAVY RAIN 4.53	1 Nnw Woodbury, NJ
Sep 7, 8:54 PM EDT	HEAVY RAIN 4.25	Philadelphia Intl Airpo, PA	2.66 INCHES FELL IN JUST 38 MINUTES EARLIER.
Sep 7, 10:03 PM EDT	HEAVY RAIN 4.43	Philadelphia Intl Airpo, PA	2.66 INCHES FELL IN JUST 38 MINUTES EARLIER.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.7 hours before the alert went out and 219 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: 1722 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

295 
WGUS51 KPHI 072241
FFWPHI
NJC007-015-PAC045-101-080245-
/O.NEW.KPHI.FF.W.0094.180907T2241Z-180908T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
641 PM EDT FRI SEP 7 2018

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Southwestern Philadelphia County in southeastern Pennsylvania...
  Southeastern Delaware County in southeastern Pennsylvania...

* Until 1045 PM EDT.

* At 639 PM EDT, Doppler radar indicated showers and thunderstorms 
  producing heavy rain across the warned area. 1 to 2 inches of rain 
  have already fallen, with Philadelphia International Airport 
  recording 0.61 inches of rain in just 9 minutes. Additional storms 
  are developing southwestward into eastern Delaware County. Flash 
  flooding is expected to begin shortly in the areas of heaviest 
  rain.

* Some locations that could experience flooding include...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford, West
  Deptford, Bellmawr, Yeadon, Woodbury, Palmyra, Folcroft, Paulsboro,
  Magnolia, Westville, Woodbury Heights, National Park, East
  Lansdowne, Brooklawn, Audubon Park and Darby Township.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 3988 7495 3982 7512 3982 7534 3994 7531
      4000 7506

$$

Gorse

2 follow-up statements

132 
WGUS71 KPHI 072313
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
713 PM EDT FRI SEP 7 2018

NJC007-015-PAC045-101-080245-
/O.CON.KPHI.FF.W.0094.000000T0000Z-180908T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Gloucester NJ-Philadelphia PA-Delaware PA-
713 PM EDT FRI SEP 7 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT FOR
NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...SOUTHWESTERN
PHILADELPHIA AND SOUTHEASTERN DELAWARE COUNTIES...

At 710 PM EDT, Doppler radar indicated showers and thunderstorms 
producing very heavy rain across the warned area. 2 to 3 inches of 
rain has already fallen, from the Philadelphia International Airport 
area across the river to the National Park and Woodbury areas of 
Gloucester County in New Jersey. Flooding has been reported on 
I-76 and PA-611 in Philadelphia County.

Some locations that could experience flooding include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford, West
Deptford, Bellmawr, Yeadon, Woodbury, Palmyra, Folcroft, Paulsboro,
Magnolia, Westville, Woodbury Heights, National Park, East Lansdowne,
Brooklawn, Audubon Park and Darby Township.

Additional rainfall amounts of 1 to 2 inches are expected in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 3988 7495 3982 7512 3982 7534 3994 7531
      4000 7506

$$

Gorse

715 
WGUS71 KPHI 080021
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
821 PM EDT FRI SEP 7 2018

NJC007-015-PAC045-101-080245-
/O.CON.KPHI.FF.W.0094.000000T0000Z-180908T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Gloucester NJ-Philadelphia PA-Delaware PA-
821 PM EDT FRI SEP 7 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT FOR
NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...SOUTHWESTERN
PHILADELPHIA AND SOUTHEASTERN DELAWARE COUNTIES...

At 818 PM EDT, local law enforcement reported flash flooding due to 
very heavy rain from showers and thunderstorms. Up to 3.5 inches of 
rain has fallen in some areas. Flash flooding is ongoing, with 
several road closures in parts of Camden and Gloucester counties. 
Flooding was also reported on I-76 and PA-611 in Philadelphia 
County. While rainfall rates have decreased, additional runoff will 
add to the flooding.

Some locations that could experience flooding include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford, West
Deptford, Bellmawr, Yeadon, Woodbury, Palmyra, Folcroft, Paulsboro,
Magnolia, Westville, Woodbury Heights, National Park, East Lansdowne,
Brooklawn, Audubon Park and Darby Township.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 3988 7495 3982 7512 3982 7534 3994 7531
      4000 7506

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 4:22 AM EDT	Small Craft Advisory	PHI		35 hr
Sep 7, 12:59 PM EDT	Special Weather Statement	PHI	Cape May	46 min
Sep 7, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	31 min
Sep 7, 1:29 PM EDT	Areal Flood Advisory	PHI	Cape May	3 hr
Sep 7, 2:20 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	30 min
Sep 7, 2:53 PM EDT	Special Weather Statement	PHI	Atlantic	37 min
Sep 7, 3:25 PM EDT	Special Weather Statement	PHI	Atlantic	50 min
Sep 7, 3:36 PM EDT	Gale Watch	PHI		24 hr
Sep 7, 5:27 PM EDT	Special Marine Warning	PHI		46 min
Sep 7, 6:32 PM EDT	Special Weather Statement	PHI	Camden	43 min
Sep 7, 7:08 PM EDT	Special Weather Statement	PHI	Camden	52 min
Sep 7, 7:19 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	56 min

Nearby

Flash Flood Warnings in Pennsylvania, 2018 Flash Flood Warnings in New Jersey, 2018 Every flash flood warning in 2018

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.