Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 76, NWS Miami, FL

August 4, 1998Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 4, 1998, 3:04 PM EDT for Miami-Dade County, Florida. It was in force for 46 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, 3:04 PM EDT (19:04 UTC)
Expired
Aug 4, 1998, 3:50 PM EDT
In force
46 min
Issued by
NWS Miami, FL
Area
Whole counties

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 9 km from the middle of the area, began a volume at 19:05 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, 7.1 hours before the alert went out and 31 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.

000 
TTAA00 KMIA 041907
SVRMIA
FLC025-041950-

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

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN DADE COUNTY IN SOUTHEASTERN FLORIDA

* UNTIL 350 PM EDT

* AT 300 PM EDT...THE NATIONAL WEATHER SERVICE AT MIAMI
  DETECTED A SEVERE THUNDERSTORM OVER KENDALL IN DADE
  COUNTY. ALTHOUGH THIS THUNDERSTORM IS MOVING VERY LITTLE
  IT HAS THE POTENTIAL TO PRODUCE VERY STRONG WINDS...
  DEADLY LIGHTNING AND HEAVY RAINS.

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, 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
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.