Alert archive / New Jersey / Flash Flood Warnings in 2008

Flash Flood Warning 33, NWS Philadelphia/Mount Holly

September 6, 20084 counties in New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 6, 2008, 5:39 PM EDT for 4 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 6, 2008, 5:39 PM EDT (21:39 UTC)
Expired
Sep 6, 2008, 10:30 PM EDT
In force
5 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 21:39 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.7 hours before the alert went out and 195 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 12:00Z on 2008-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 756 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2008-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 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
756 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
562 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.2

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 062139
FFWPHI
NJC005-007-015-021-PAC017-045-091-101-070230-
/O.NEW.KPHI.FF.W.0033.080906T2139Z-080907T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
539 PM EDT SAT SEP 6 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 1030 PM EDT

* AT 536 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED       
  HEAVY RAIN ACROSS PORTIONS OF THE WARNED AREA. RADAR ESTIMATES     
  AND RAIN GAGES INDICATE THAT BETWEEN 1.5 AND 2 INCHES HAVE ALREADY 
  FALLEN IN SPOTS. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE  
  POSSIBLE THROUGH THIS EVENING. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WISSINOMING...WASHINGTON CROSSING...TACONY...NORTHEAST
  PHILADELPHIA...HOLMESBURG...CHESTNUT HILL...BENSALEM...ANDALUSIA...
  WINDSOR...JOBSTOWN...JACKSONVILLE...GEORGETOWN...EDINBURG...
  CROSSWICKS...GERMANTOWN...WOODSIDE...WILLOW GROVE...ROCKLEDGE...
  RICHBORO...RADNOR TOWNSHIP...PLYMOUTH MEETING...NEWTOWN...NEW
  HOPE...LEVITTOWN...LANGHORNE...IVYLAND...FEASTERVILLE...BRYN
  MAWR...BRISTOL...AMBLER...WILLINGBORO...WHITE HORSE...TRENTON...
  RIVERSIDE...PRINCETON...PENNINGTON...MERCERVILLE-HAMILTON SQUARE...
  LAWRENCEVILLE...HOPEWELL...FLORENCE...EWING...BURLINGTON...
  BORDENTOWN...BEVERLY AND ALLENTOWN

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

LAT...LON 4017 7457 4017 7462 4007 7456 3968 7532
      3982 7546 3984 7556 3987 7562 3999 7545
      4000 7546 4004 7542 4037 7496 4035 7495
      4034 7486 4038 7485 4042 7475 4037 7473
      4038 7463 4034 7465 4026 7448

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 4:43 PM EDTAreal Flood WarningPHIMorris, Sussex, Warren6 hr
Sep 6, 5:47 PM EDTAreal Flood WarningPHIHunterdon, Middlesex, Somerset5 hr
Sep 6, 6:11 PM EDTTornado WarningPHIBurlington49 min
Sep 6, 6:41 PM EDTAreal Flood WarningPHIMonmouth5 hr
Sep 6, 3:33 PM EDTAreal Flood WarningPHIBerks, Carbon, Lehigh, Monroe, Northampton6 hr
Sep 6, 4:22 PM EDTAreal Flood WarningPHIChester6 hr

Nearby

Flash Flood Warnings in New Jersey, 2008Flash Flood Warnings in Pennsylvania, 2008Every flash flood warning in 2008

Sources

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.