Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 28, NWS Miami, FL

March 9, 1998Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Mar 9, 1998, 7:43 AM EST for Miami-Dade 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
Mar 9, 1998, 7:43 AM EST (12:43 UTC)
Expired
Mar 9, 1998, 8:30 AM EST
In force
47 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 12:44 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

Key West, FL (KEYW), launched 12:00Z, 0.7 hours before the alert went out and 169 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, Key West, FL at 12:00Z on 1998-03-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1873 joules per kilogram.LCLEL10008507005003002001001 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, Key West, FL at 12:00Z on 1998-03-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 214 square meters per square second.19395878Sfc1 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
1873 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
583 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
214 m²/s²
0-3 km storm-relative helicity
233 m²/s²
Significant tornado parameter
2.1
Supercell composite
12.2

Open this sounding in Storm Lab

The text

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

687 
WUUS1 KMIA 091245 RRA
SVRMIA
FLC025-091330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
743 AM EST MON MAR 9 1998

THE NATIONAL WEATHER SERVICE IN MIAMI FL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 830 AM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEASTERN FLORIDA

   ...SOUTHEASTERN DADE COUNTY

AT 740 AM EST... DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS OVER EXTREME SOUTHEAST DADE COUNTY. THIS LINE WAS
MOVING TO THE SOUTHEAST AT 30 MILES AN HOUR.

THESE STORMS WILL MOVE THROUGH CUTLER RIDGE TO HOMESTEAD BY 830
AM.

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
Mar 9, 2:41 AM ESTSevere Thunderstorm WarningMFLCollier59 min
Mar 9, 3:22 AM ESTSevere Thunderstorm WarningMFLCollier, Glades, Hendry63 min
Mar 9, 4:09 AM ESTSevere Thunderstorm WarningMFLPalm Beach31 min
Mar 9, 4:21 AM ESTSevere Thunderstorm WarningMFLCollier34 min
Mar 9, 4:41 AM ESTSevere Thunderstorm WarningMFLPalm Beach64 min
Mar 9, 5:33 AM ESTTornado WarningMFLBroward32 min
Mar 9, 5:54 AM ESTTornado WarningMFLMiami-Dade21 min
Mar 9, 6:06 AM ESTTornado WarningMFLBroward29 min
Mar 9, 6:18 AM ESTSevere Thunderstorm WarningMFLMiami-Dade62 min
Mar 9, 8:09 AM ESTSevere Thunderstorm WarningMFLMonroe91 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.