Alert archive / Florida / Flash Flood Warnings in 1999

Flash Flood Warning 21, NWS Miami, FL

October 19, 1999Palm Beach County, Florida

NWS Miami, FL issued this flash flood warning at Oct 19, 1999, 11:35 PM EDT for Palm Beach County, Florida. 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 counties it named.

The facts

Issued
Oct 19, 1999, 11:35 PM EDT (03:35 UTC)
Expired
Oct 20, 1999, 11:30 AM EDT
In force
12 hr
Issued by
NWS Miami, FL
Area
Whole counties

County Palm Beach County, FL

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 3.6 hours before the alert went out and 93 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, Miami, FL at 00:00Z on 1999-10-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 561 joules per kilogram.LCLLFCEL10008507005003002001001 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, Miami, FL at 00:00Z on 1999-10-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.1939Sfc1 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
561 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
1037 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
50 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 KMIA 200336
FFWMIA
FLC099-201530-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MIAMI FL
1135 PM EDT TUE OCT 19 1999

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* FLOOD WARNING FOR...
  NORTHERN AND NORTH CENTRAL PALM BEACH COUNTY IN SOUTHEASTERN
  FLORIDA

* UNTIL 1130 AM EDT

* PALM BEACH EMERGENCY MANAGEMENT HAS REPORTED SEVERAL BREAKS IN THE
  LEVEE SURROUNDING THE CORBETT WILDLIFE MANAGEMENT AREA AT 1000 PM.
  THIS WILL LIKELY CAUSE FLOOD WATERS TO INNUNDATE SURROUNDING AREAS
  WITHIN THE NEXT FEW HOURS. FLOODING IS EXPECTED TO LAST THROUGH
  THE NIGHT AT LEAST AND AFFECT NEARBY PROPERTY OWNERS AS WELL AS
  PRODUCE A THREAT TO PUBLIC SAFETY. PERSONS IN AND AROUND THIS PART
  OF PALM BEACH COUNTY SHOULD EXERCISE EXTREME CAUTION UNTIL MORE
  INFORMATION BECOMES AVAILABLE AND ADDITIONAL STATEMENTS ARE ISSUED.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. DO NOT DRIVE INTO AREAS OF PONDING WATER OF
UNKNOWN DEPTH. IF FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP OR 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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED
QUICKLY. MOVE TO HIGHER GROUND.

Nearby

Flash Flood Warnings in Florida, 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.