Alert archive / Pennsylvania / Areal Flood Warnings in 2008

Areal Flood Warning 13, NWS Philadelphia/Mount Holly

December 11, 20085 counties in Pennsylvania; 4 counties in New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood warning at Dec 11, 2008, 9:32 PM EST for 5 counties in Pennsylvania; 4 counties in New Jersey; New Castle County, Delaware. It was in force for 12 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
Dec 11, 2008, 9:32 PM EST (02:32 UTC)
Expired
Dec 12, 2008, 9:30 AM EST
In force
12 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 02:35 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.5 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2008-12-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2008-12-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 648 square meters per square second.1939587897Sfc1 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
2 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
481 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
648 m²/s²
0-3 km storm-relative helicity
918 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.

000 
WGUS41 KPHI 120232
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
932 PM EST THU DEC 11 2008

DEC003-NJC005-007-015-021-PAC017-029-045-091-101-121030-
/O.NEW.KPHI.FA.W.0013.081212T0232Z-081212T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
932 PM EST THU DEC 11 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLOOD WARNING FOR...
  WEST CENTRAL MERCER COUNTY IN CENTRAL NEW JERSEY...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF NEWARK...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WEST CHESTER...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WILLOW GROVE...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 530 AM EST FRIDAY

* AT 928 PM EST...SURFACE OBSERVATIONS AND RAINFALL ESTIMATES FROM   
  NATIONAL WEATHER SERVICE DOPPLER RADARS INDICATED THAT UP TO ONE   
  AND ONE-HALF INCHES OF RAIN HAVE FALLEN ACROSS PORTIONS OF   
  THE ADVISED AREA. RADAR ALSO INDICATED THAT MORE HEAVY RAINFALL    
  WILL CONTINUE TO MOVE INTO PORTIONS OF THE REGION THE NEXT SEVERAL 
  HOURS. BECAUSE OF THE URBAN ENVIRONMENT, RUNOFF HAS BEEN           
  EFFICIENTLY MAKING IT INTO LOCAL CREEKS AND STREAMS. FLOODING IS   
  LIKELY, BUT NOT EXCLUSIVE TO FRANKFORD CREEK IN PHILADELPHIA       
  COUNTY AND VALLEY CREEK IN CHESTER COUNTY.  

A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN REPORTED.
STREAM RISES WILL BE SLOW AND FLASH FLOODING IS NOT EXPECTED.
HOWEVER...ALL INTERESTED PARTIES SHOULD TAKE NECESSARY PRECAUTIONS
IMMEDIATELY.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO 
HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO
FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A FLOOD WARNING MEANS FLOODING IS OCCURRING OR IS IMMINENT. MOST
FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO
CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING
WATER MOVE UP TO HIGHER GROUND.

LAT...LON 4004 7565 4032 7493 4015 7472 4016 7471
      4013 7466 3979 7543 3965 7578 3984 7580

$$

KRUZDLO
2 follow-up statements
000 
WGUS81 KPHI 120326
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1026 PM EST THU DEC 11 2008

DEC003-NJC005-007-015-021-PAC017-029-045-091-101-121030-
/O.CON.KPHI.FA.W.0013.000000T0000Z-081212T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAMDEN NJ-GLOUCESTER NJ-MERCER NJ-DELAWARE PA-PHILADELPHIA PA-
CHESTER PA-MONTGOMERY PA-BUCKS PA-NEW CASTLE DE-BURLINGTON NJ-
1026 PM EST THU DEC 11 2008

...THE FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM EST FRIDAY FOR
NORTHWESTERN BURLINGTON...NORTHERN NEW CASTLE...SOUTHEASTERN BUCKS...
SOUTHEASTERN MONTGOMERY...SOUTHEASTERN CHESTER...PHILADELPHIA...
DELAWARE...EXTREME SOUTH CENTRAL MERCER...NORTHWESTERN GLOUCESTER AND
NORTHWESTERN CAMDEN COUNTIES...

AT 1023 PM EST...SURFACE OBSERVATIONS AND RAINFALL ESTIMATES FROM    
NATIONAL WEATHER SERVICE DOPPLER RADARS INDICATED THAT UP TO TWO     
INCHES OF RAIN HAVE FALLEN ACROSS PORTIONS OF THE WARNED AREA.       
RADAR ALSO INDICATED THAT MORE HEAVY RAINFALL WILL CONTINUE TO       
MOVE INTO PORTIONS OF THE REGION THE NEXT SEVERAL HOURS. BECAUSE     
OF THE URBAN ENVIRONMENT, RUNOFF HAS BEEN EFFICIENTLY MAKING IT      
INTO LOCAL CREEKS AND STREAMS. 

FLOODING IS LIKELY, BUT NOT EXCLUSIVE TO FRANKFORD CREEK AND 
PENNYPACK CREEK IN PHILADELPHIA COUNTY, VALLEY CREEK IN CHESTER 
COUNTY, AND CRUM CREEK IN DELAWARE COUNTY..  

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO 
HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO
FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A FLOOD WARNING MEANS FLOODING IS OCCURRING OR IS IMMINENT. MOST
FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO
CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING
WATER MOVE UP TO HIGHER GROUND.

LAT...LON 4004 7565 4032 7493 4015 7472 4016 7471
      4013 7466 3979 7543 3965 7578 3984 7580

$$

KRUZDLO
000 
WGUS41 KPHI 120958
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
458 AM EST FRI DEC 12 2008

DEC003-NJC005-007-015-021-PAC017-029-045-091-101-121430-
/O.EXT.KPHI.FA.W.0013.000000T0000Z-081212T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
458 AM EST FRI DEC 12 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLOOD WARNING FOR...
  EXTREME SOUTH CENTRAL MERCER COUNTY IN CENTRAL NEW JERSEY...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF NEWARK...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WEST CHESTER...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WILLOW GROVE...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 930 AM EST

* AT 456 AM EST...FLOODING CONTINUES ALTHOUGH THE HEAVIEST RAINS     
  HAVE ENDED.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO 
HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO
FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A FLOOD WARNING MEANS FLOODING IS OCCURRING OR IS IMMINENT. MOST
FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO
CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING
WATER MOVE UP TO HIGHER GROUND.

LAT...LON 4004 7565 4032 7493 4015 7472 4016 7471
      4013 7466 3979 7543 3965 7578 3984 7580

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 11, 9:47 PM ESTAreal Flood AdvisoryPHIBerks, Bucks, Chester, Lehigh, Montgomery6 hr
Dec 12, 12:55 AM ESTAreal Flood WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery12 hr
Dec 12, 2:12 AM ESTRiver Flood WarningPHIBerks, Schuylkill13 hr
Dec 12, 2:41 AM ESTRiver Flood WarningPHIMontgomery10 hr
Dec 12, 2:48 AM ESTAreal Flood AdvisoryPHICarbon, Monroe, Northampton6 hr
Dec 12, 3:46 AM ESTRiver Flood WarningPHIChester10 hr
Dec 12, 7:45 AM ESTRiver Flood WarningPHIBucks7 hr
Dec 12, 8:34 AM ESTAreal Flood AdvisoryPHIBucks, Carbon, Lehigh, Monroe, Northampton3 hr
Dec 12, 9:00 AM ESTCoastal Flood AdvisoryPHIDelaware, Philadelphia6 hr
Dec 12, 9:02 AM ESTRiver Flood WarningPHIMontgomery, Philadelphia6 hr
Dec 12, 11:17 AM ESTRiver Flood WarningPHIChester, Delaware9 hr
Dec 11, 7:46 PM ESTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Salem9 hr
Dec 11, 9:00 PM ESTAreal Flood AdvisoryPHIBurlington, Mercer, Middlesex, Monmouth, Ocean13 hr
Dec 11, 9:10 PM ESTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Monmouth, Ocean3 hr
Dec 11, 10:05 PM ESTAreal Flood WarningPHIBurlington, Camden, Gloucester11 hr
Dec 11, 10:41 PM ESTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset6 hr
Dec 11, 10:59 PM ESTSpecial Marine WarningPHI2 hr
Dec 11, 11:20 PM ESTAreal Flood WarningPHIHunterdon, Somerset14 hr
Dec 11, 11:49 PM ESTAreal Flood WarningPHIAtlantic, Burlington, Cape May, Monmouth, Ocean14 hr
Dec 12, 12:53 AM ESTSpecial Marine WarningPHI112 min
Dec 12, 5:42 AM ESTRiver Flood WarningPHISomerset36 hr
Dec 12, 9:07 AM ESTRiver Flood WarningPHIMiddlesex, Somerset20 hr
Dec 12, 9:40 AM ESTRiver Flood WarningPHIEssex, Morris, Passaic4 days
Dec 12, 9:40 AM ESTRiver Flood WarningPHIMorris, Passaic19 hr
Dec 12, 9:40 AM ESTRiver Flood WarningPHIBurlington30 hr
Dec 12, 9:40 AM ESTRiver Flood WarningPHISomerset6 hr
Dec 12, 9:40 AM ESTRiver Flood WarningPHIMorris20 hr
Dec 12, 9:40 AM ESTRiver Flood WarningPHIMorris34 hr
Dec 12, 9:50 AM ESTRiver Flood WarningPHIMiddlesex, Somerset19 hr
Dec 12, 1:13 PM ESTAreal Flood WarningPHISomerset28 hr
Dec 12, 1:44 PM ESTAreal Flood WarningPHIMonmouth, Ocean6 hr
Dec 11, 9:39 PM ESTRiver Flood WarningPHINew Castle14 hr
Dec 12, 4:19 AM ESTRiver Flood WarningPHINew Castle8 hr
Dec 12, 4:31 AM ESTRiver Flood WarningPHINew Castle9 hr

Nearby

Areal Flood Warnings in Pennsylvania, 2008Areal Flood Warnings in New Jersey, 2008Areal Flood Warnings in Delaware, 2008Every areal 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.