Alert archive / New Jersey / Flash Flood Warnings in 1999

Flash Flood Warning 24, NWS Philadelphia/Mount Holly

August 20, 1999Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 20, 1999, 4:40 PM EDT for Ocean County, New Jersey. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 20, 1999, 4:40 PM EDT (20:40 UTC)
Expired
Aug 20, 1999, 7:40 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Ocean County, NJ

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.7 hours before the alert went out and 162 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 1999-08-20Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 1999-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -81 square meters per square second.19395878Sfc1 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
1602 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-81 m²/s²
0-3 km storm-relative helicity
-3 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 
TTAA00 KPHL 202042
FFWPHL
NJC029-202340-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
440 PM EDT FRI AUG 20 1999

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME EASTERN OCEAN COUNTY IN NEW JERSEY.

* UNTIL 740 PM EDT.

* AT 430 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED HEAVY RAIN OVER LONG BEACH ISLAND NJ AS WELL
  AS THE ADJACENT MAIN LAND WITH TWO TO THREE INCH STORM
  TOTALS SO FAR. THIS RAIN...IN COMBINATION WITH HIGH TIDE...
  IS PRODUCING STREET FLOODING THROUGHOUT THE AREA.

  A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
  IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
  ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE
  ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...
  ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

  FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
  RADIO...YOUR LOCAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE
  TELEVISION OUTLET.

  .END
  WN/JM


&

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 9:34 AM EDTSevere Thunderstorm WarningPHICumberland, Salem46 min

Nearby

Flash Flood Warnings in New Jersey, 1999Every flash flood warning in 1999

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.