Alert archive / New Jersey / Flash Flood Warnings in 2009

Flash Flood Warning 26, NWS Philadelphia/Mount Holly

July 31, 20096 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 31, 2009, 5:07 PM EDT for 6 counties in New Jersey. It was in force for 3 hr. 1 report 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, 2009, 5:07 PM EDT (21:07 UTC)
Expired
Jul 31, 2009, 7:43 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 76 km from the middle of the area, began a volume at 21:09 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 31, 5:28 PM EDTHEAVY RAIN 1.52Mount Holly, NJ1.52 INCHES OF RAIN WAS MEASURED AT THE SOUTH JERSEY REGIONAL AIRPORT IN 34 MINUTES.

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, 9.1 hours before the alert went out and 172 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, Wallops Is Stn, VA at 12:00Z on 2009-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 969 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, Wallops Is Stn, VA at 12:00Z on 2009-07-31The 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
969 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
484 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
101 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.0

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 312107
FFWPHI
NJC001-005-007-011-015-033-010100-
/O.NEW.KPHI.FF.W.0026.090731T2107Z-090801T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
507 PM EDT FRI JUL 31 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...VINELAND...MILLVILLE...
  EASTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 900 PM EDT

* AT 504 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  AN AREA OF EXCESSIVE RAINFALL OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VOORHEES...
  TABERNACLE...SPRINGDALE...SICKLERVILLE...SHAMONG...MARLTON LAKES...
  LUMBERTON...JOBSTOWN...GEORGETOWN...ATSION...ATCO...WRIGHTSTOWN...
  WILLIAMSTOWN...WHARTON STATE FOREST...VICTORY LAKES...
  TURNERSVILLE...PRESIDENTIAL LAKES...PEMBERTON...MOUNT HOLLY...
  MEDFORD...MARLTON...LINDENWOLD...LEISURETOWNE...HAMMONTON...
  GLASSBORO...CLAYTON...CHESILHURST...CHATSWORTH...BROWNS MILLS AND
  BERLIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. 
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.  
DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN 
DEPTH BY FOOT OR BY AUTOMOBILE.

&&

LAT...LON 3924 7520 3929 7527 3929 7532 3934 7535
      3933 7537 3948 7555 4013 7460 3985 7443

$$

KRUZDLO
1 follow-up statement
000 
WGUS71 KPHI 312343
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
743 PM EDT FRI JUL 31 2009

NJC001-005-007-011-015-033-312353-
/O.CAN.KPHI.FF.W.0026.000000T0000Z-090801T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SALEM NJ-CUMBERLAND NJ-CAMDEN NJ-GLOUCESTER NJ-ATLANTIC NJ-
BURLINGTON NJ-
743 PM EDT FRI JUL 31 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR BURLINGTON...
WESTERN ATLANTIC...EASTERN GLOUCESTER...CAMDEN...CUMBERLAND AND
SOUTHEASTERN SALEM COUNTIES...

LAT...LON 3924 7520 3929 7527 3929 7532 3934 7535
      3933 7537 3948 7555 4013 7460 3985 7443

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 2:13 PM EDTFlash Flood WarningPHISussex4 hr
Jul 31, 2:36 PM EDTFlash Flood WarningPHIHunterdon, Morris, Sussex, Warren4 hr
Jul 31, 4:03 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem57 min
Jul 31, 4:08 PM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester, Salem3 hr
Jul 31, 4:23 PM EDTSpecial Marine WarningPHI67 min
Jul 31, 4:31 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester, Salem59 min
Jul 31, 4:39 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more96 min
Jul 31, 4:56 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset114 min
Jul 31, 5:10 PM EDTTornado WarningPHIBurlington, Ocean21 min
Jul 31, 5:14 PM EDTSpecial Marine WarningPHI2 hr
Jul 31, 5:15 PM EDTSevere Thunderstorm WarningPHIAtlantic, Ocean60 min
Jul 31, 5:16 PM EDTSpecial Marine WarningPHI119 min
Jul 31, 5:31 PM EDTFlash Flood WarningPHIBurlington, Monmouth, Ocean4 hr
Jul 31, 5:48 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Cumberland, Ocean3 hr

Nearby

Flash Flood Warnings in New Jersey, 2009Every flash flood warning in 2009

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.