Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 80, NWS Miami, FL

August 4, 1998Glades County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 4, 1998, 6:57 PM EDT for Glades County, Florida. It was in force for 63 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
Aug 4, 1998, 6:57 PM EDT (22:57 UTC)
Expired
Aug 4, 1998, 8:00 PM EDT
In force
63 min
Issued by
NWS Miami, FL
Area
Whole counties

County Glades County, FL

The radar

The Melbourne radar (KMLB), 139 km from the middle of the area, began a volume at 22:59 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

Tampa Bay, FL (KTBW), launched 12:00Z, 11.0 hours before the alert went out and 146 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, Tampa Bay, FL at 12:00Z on 1998-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 583 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, Tampa Bay, FL at 12:00Z on 1998-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
583 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
999 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
41 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.

154 
WUUS1 KMIA 042259 RRA
SVRMIA
FLC043-050000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
657 PM EDT TUE AUG 4 1998

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GLADES COUNTY IN SOUTHERN FLORIDA

* UNTIL 800 PM EDT

* AT 645 PM...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS
  THAT WILL BECOME SEVERE OVER WESTERN GLADES COUNTY WEST OF
  PALMDALE AND OTHERS THAT WILL MOVE INTO THE COUNTY FROM THE
  NORTH. MOVEMENT WILL BE TO THE SOUTH AT 10 MPH.

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
Aug 3, 8:05 PM EDTTornado WarningMFLGlades, Hendry45 min
Aug 4, 3:04 PM EDTSevere Thunderstorm WarningMFLMiami-Dade46 min
Aug 4, 4:04 PM EDTSevere Thunderstorm WarningMFLBroward, Palm Beach61 min
Aug 4, 4:08 PM EDTSevere Thunderstorm WarningMFLCollier62 min
Aug 4, 5:02 PM EDTSevere Thunderstorm WarningMFLBroward58 min

Nearby

Severe Thunderstorm Warnings in Florida, 1998Every severe thunderstorm warning in 1998

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.