Alert archive / Pennsylvania / Flash Flood Warnings in 2015

Flash Flood Warning 32, NWS Philadelphia/Mount Holly

July 9, 2015Burlington County, Camden County, New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 9, 2015, 8:51 PM EDT for Burlington County, Camden County, New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 4 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 9, 2015, 8:51 PM EDT (00:51 UTC)
Expired
Jul 10, 2015, 12:45 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Burlington County, NJ, Camden County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 38 km from the middle of the area, began a volume at 00:53 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

TimeReportWhereRemark
Jul 9, 8:52 PM EDTFLASH FLOODPhiladelphia, PAFRANKFORD CREEK OVERFLOWED ITS BANKS DUE TO A FLASH FLOOD.
Jul 9, 9:00 PM EDTHEAVY RAIN 2.25Burlington, NJ1-HR TOTAL

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 00:00Z, 0.9 hours before the alert went out and 186 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2015-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2015-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
676 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

654 
WGUS51 KPHI 100051
FFWPHI
NJC005-007-PAC017-091-101-100445-
/O.NEW.KPHI.FF.W.0032.150710T0051Z-150710T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
851 PM EDT THU JUL 9 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 1245 AM EDT
    
* AT 851 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  PHILADELPHIA...CAMDEN...GLOUCESTER CITY...BENSALEM...MOUNT
  LAUREL...WILLINGBORO...LUMBERTON...FLORENCE...BURLINGTON...
  BRISTOL...MOUNT HOLLY...RIVERSIDE...CONSHOHOCKEN...PALMYRA...
  JENKINTOWN...NARBERTH...BORDENTOWN...BEVERLY...ROCKLEDGE AND
  TULLYTOWN.

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 3990 7521 4010 7533 4018 7474 4015 7472
      4017 7470 4017 7471 4019 7470 4014 7462
      4013 7458 3993 7447

$$

SFJ
2 follow-up statements
099 
WGUS71 KPHI 100138
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
938 PM EDT THU JUL 9 2015

NJC005-007-PAC017-091-101-100445-
/O.CON.KPHI.FF.W.0032.000000T0000Z-150710T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAMDEN NJ-BURLINGTON NJ-BUCKS PA-PHILADELPHIA PA-MONTGOMERY PA-
938 PM EDT THU JUL 9 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT FOR
NORTHWESTERN CAMDEN...NORTHERN BURLINGTON...SOUTHEASTERN BUCKS...
PHILADELPHIA AND SOUTHEASTERN MONTGOMERY COUNTIES...

AT 937 PM EDT...DOPPLER RADAR INDICATED HEAVY RAIN HAD MOSTLY LEFT 
THE WARNED AREA. HOWEVER...RUNOFF WILL BE SLOW TO RECEDE. UP TO TWO 
INCHES OF RAIN HAVE ALREADY FALLEN. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...CAMDEN...GLOUCESTER CITY...BENSALEM...MOUNT LAUREL...
WILLINGBORO...LUMBERTON...FLORENCE...BURLINGTON...BRISTOL...MOUNT
HOLLY...RIVERSIDE...CONSHOHOCKEN...PALMYRA...JENKINTOWN...NARBERTH...
BORDENTOWN...BEVERLY...ROCKLEDGE AND TULLYTOWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3990 7521 4010 7533 4018 7474 4015 7472
      4017 7470 4017 7471 4019 7470 4014 7462
      4013 7458 3993 7447

$$

SFJ
019 
WGUS71 KPHI 100259
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1059 PM EDT THU JUL 9 2015

NJC005-007-PAC017-091-101-100307-
/O.CAN.KPHI.FF.W.0032.000000T0000Z-150710T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAMDEN NJ-BURLINGTON NJ-BUCKS PA-PHILADELPHIA PA-MONTGOMERY PA-
1059 PM EDT THU JUL 9 2015

...THE FLASH FLOOD WARNING FOR NORTHWESTERN CAMDEN...NORTHERN
BURLINGTON...SOUTHEASTERN BUCKS...PHILADELPHIA AND SOUTHEASTERN
MONTGOMERY COUNTIES IS CANCELLED...

THE HEAVY RAINFALL HAS ENDED. ANY HIGH WATER ON AREA CREEKS AND 
STREAMS HAVE RECEDED...AND ARE NO LONGER EXPECTED TO POSE A THREAT 
TO LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD CLOSURES.

LAT...LON 3990 7521 4010 7533 4018 7474 4015 7472
      4017 7470 4017 7471 4019 7470 4014 7462
      4013 7458 3993 7447

$$

JRK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 8:17 PM EDTSpecial Marine WarningPHI58 min
Jul 9, 8:19 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more71 min
Jul 9, 8:28 PM EDTSpecial Weather StatementPHIMonmouth47 min
Jul 9, 8:45 PM EDTSpecial Marine WarningPHI60 min
Jul 9, 8:53 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland37 min
Jul 9, 8:55 PM EDTTornado WarningPHIBurlington20 min
Jul 9, 9:19 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May41 min
Jul 9, 9:28 PM EDTSpecial Marine WarningPHI62 min
Jul 9, 10:00 PM EDTSpecial Marine WarningPHI60 min

Nearby

Flash Flood Warnings in Pennsylvania, 2015Flash Flood Warnings in New Jersey, 2015Every flash flood warning in 2015

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.