Alert archive / Florida / Flash Flood Warnings in 1999

Flash Flood Warning 18, NWS Miami, FL

October 15, 1999Palm Beach County, Florida

NWS Miami, FL issued this flash flood warning at Oct 15, 1999, 5:52 PM EDT for Palm Beach County, Florida. It was in force for 2 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 15, 1999, 5:52 PM EDT (21:52 UTC)
Expired
Oct 15, 1999, 8:00 PM EDT
In force
2 hr
Issued by
NWS Miami, FL
Area
Whole counties

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 115 km from the middle of the area, began a volume at 22:03 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

Miami, FL (KMFL), launched 12:00Z, 9.9 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 12:00Z on 1999-10-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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 12:00Z on 1999-10-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 214 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
13 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
214 m²/s²
0-3 km storm-relative helicity
271 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMIA 152152
FFWMIA
FLC011-021-025-099-152345-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MIAMI FL
552 PM EDT FRI OCT 15 1999

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* FLOOD WARNING FOR...
  PALM BEACH COUNTY IN SOUTHEASTERN FLORIDA
  BROWARD COUNTY IN SOUTHEASTERN FLORIDA
  DADE COUNTY IN SOUTHEASTERN FLORIDA
  EASTERN COLLIER COUNTY IN SOUTHWESTERN FLORIDA

* UNTIL 800 PM EDT

* AT 600 PM EDT...DOPPLER RADAR INDICATED THAT VERY HEAVY RAINFALL
  ...ASSOCIATED WITH HURRICANE IRENE...CONTINUED TO SPREAD NORTH
  ACROSS NORTH AND EAST SECTIONS OF MIAMI-DADE COUNTY...BROWARD...
  PALM BEACH AND EASTERN COLLIER COUNTY. THESE HEAVY RAINS WILL
  CONTINUE TO CAUSE WIDESPREAD FLOODING ACROSS THESE AREAS AT LEAST
  THROUGH THE EARLY PART OF THIS EVENING. ADDITIONAL RAINFALL
  ACCUMULATIONS OF UP TO 4 INCHES ARE POSSIBLE THROUGH 8 PM THIS
  EVENING.

  THE HEAVIEST RAIN WAS OVER THE NORTH AND EAST SECTIONS OF MIAMI-
  DADE...BROWARD AND SOUTHERN SECTIONS OF PALM BEACH COUNTY. THIS
  RAIN WILL MOVE FURTHER NORTH INTO PALM BEACH COUNTY DURING THE
  NEXT HOUR.

A FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT.
MOST FLOOD DEATHS OCCUR IN AUTOM"OBILES. 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.

The office that day

Everything else NWS Miami, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 15, 8:31 AM EDTFlash Flood WarningMFLMiami-Dade2 hr
Oct 15, 10:29 AM EDTFlash Flood WarningMFLBroward116 min
Oct 15, 10:29 AM EDTFlash Flood WarningMFLMiami-Dade, Monroe116 min
Oct 15, 10:42 AM EDTFlash Flood WarningMFLBroward, Miami-Dade103 min
Oct 15, 10:42 AM EDTFlash Flood WarningMFLMonroe103 min
Oct 15, 12:30 PM EDTFlash Flood WarningMFLBroward, Collier, Miami-Dade, Monroe3 hr
Oct 15, 12:30 PM EDTFlash Flood WarningMFLPalm Beach3 hr
Oct 15, 2:41 PM EDTFlash Flood WarningMFLBroward, Collier, Miami-Dade, Palm Beach3 hr
Oct 15, 2:41 PM EDTFlash Flood WarningMFLMonroe3 hr
Oct 15, 5:52 PM EDTFlash Flood WarningMFLBroward, Collier, Miami-Dade2 hr

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; radar from the NEXRAD Level II archive.