Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 29, NWS Miami, FL

May 8, 1999Collier County, Hendry County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 8, 1999, 5:18 PM EDT for Collier County, Hendry County, Florida. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 8, 1999, 5:18 PM EDT (21:18 UTC)
Expired
May 8, 1999, 6:05 PM EDT
In force
47 min
Issued by
NWS Miami, FL
Area
Whole counties

Counties Collier County, FL, Hendry County, FL

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 9.3 hours before the alert went out and 113 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 1999-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 546 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 1999-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
546 J/kg
Mixed-layer CIN
-233 J/kg
Mixed-layer LCL
1020 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
25 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.

999 
WUUS1 KMIA 082119 RRA
SVRMIA
FLC021-051-082205-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
518 PM EDT SAT MAY 8 1999

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN COLLIER COUNTY IN SOUTHWESTERN FLORIDA
  WESTERN HENDRY COUNTY IN SOUTHERN FLORIDA

* UNTIL 605 PM EDT

* AT 515 PM MIAMI DOPPLER RADAR INDICATED A CLUSTER OF SEVERE
  THUNDERSTORMS FROM NEAR IMMOKALEE TO JUST SOUTH OF LA BELLE.
  SEVERAL REPORTS OF GOLF BALL SIZE HAIL HAVE BEEN RECEIVED FROM
  THIS AREA. THE SEVERE THUNDERSTORMS CONTINUE TO PRODUCE LARGE
  HAIL..TORRENTIAL RAINFALL..STRONG GUSTY WINDS..AND FREQUENT
  LIGHTNING. THE STORMS WILL MOVE LITTLE DURING THE NEXT 30 TO 45
  MINUTES. LOCALIZED FLOODING IS ALSO LIKELY WITH THE SLOW MOVEMENT
  WITH THESE STORMS.



SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. SEEK SHELTER
IN A STRONG BUILDING. STAY AWAY FROM WINDOWS. DO NOT USE TELEPHONES
OR ELECTRICAL APPLIANCES.

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 5:24 PM EDTSevere Thunderstorm WarningMFLMiami-Dade, Monroe36 min

Nearby

Severe Thunderstorm Warnings in Florida, 1999Every severe thunderstorm 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.