Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 21, NWS Miami, FL

March 1, 1998Hendry County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Mar 1, 1998, 3:01 AM EST for Hendry County, Florida. It was in force for 49 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 1, 1998, 3:01 AM EST (08:01 UTC)
Expired
Mar 1, 1998, 3:50 AM EST
In force
49 min
Issued by
NWS Miami, FL
Area
Whole counties

County Hendry County, FL

The radar

The Miami radar (KAMX), 129 km from the middle of the area, began a volume at 07:57 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 00:00Z, 8.0 hours before the alert went out and 120 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 00:00Z on 1998-03-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1449 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 00:00Z on 1998-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.1939587897117Sfc1 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
1449 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
748 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMIA 010801 RRA
SVRMIA
FLC051-010850-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
301 AM EST SUN MAR 1 1998

THE NATIONAL WEATHER SERVICE IN MIAMI FL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 350 AM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHERN FLORIDA

   ...CENTRAL HENDRY COUNTY

AT 259 AM EST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
OVER CENTRAL HENDRY COUNTY 5 TO 7 MILES SOUTH OF DEVILS GARDEN. THIS
STORM IS MOVING EAST AT 25 MPH AND WILL AFFECT EAST CENTRAL HENDRY
COUNTY THROUGH 345 AM.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH
LITTLE OR NO ADVANCE WARNING. REMAIN ALERT TO RAPIDLY CHANGING
WEATHER CONDITIONS.

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 1, 3:15 AM ESTTornado WarningMFLHendry35 min
Mar 1, 4:21 AM ESTTornado WarningMFLPalm Beach49 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.