Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 78, NWS Miami, FL

August 4, 1998Collier County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 4, 1998, 4:08 PM EDT for Collier County, Florida. It was in force for 62 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, 4:08 PM EDT (20:08 UTC)
Expired
Aug 4, 1998, 5:10 PM EDT
In force
62 min
Issued by
NWS Miami, FL
Area
Whole counties

County Collier County, FL

The radar

The Miami radar (KAMX), 111 km from the middle of the area, began a volume at 20:08 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, 8.1 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 1998-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1308 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 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
1308 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1035 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
12 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.

116 
WUUS1 KMIA 042010 RRA
SVRMIA
FLC021-042110-

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

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COLLIER COUNTY IN SOUTHWESTERN FLORIDA

* UNTIL 510 PM EDT

* AT 405 PM EDT...MIAMI RADAR INDICATED A SEVERE THUNDERSTORM ABOUT
  15 MILES EAST OF NAPLES IN COLLIER COUNTY.  THIS THUNDERSTORM
  IS DRIFTING SLOWLY EAST.

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, 5:02 PM EDTSevere Thunderstorm WarningMFLBroward58 min
Aug 4, 6:57 PM EDTSevere Thunderstorm WarningMFLGlades63 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.