Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 39, NWS Melbourne, FL

March 20, 1998Okeechobee County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 20, 1998, 2:54 PM EST for Okeechobee County, Florida. It was in force for 61 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 20, 1998, 2:54 PM EST (19:54 UTC)
Expired
Mar 20, 1998, 3:55 PM EST
In force
61 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Okeechobee County, FL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Mar 20, 12:30 PM ESTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 7.9 hours before the alert went out and 126 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, Cape Canaveral, FL at 12:00Z on 1998-03-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 61 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, Cape Canaveral, FL at 12:00Z on 1998-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 241 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
61 J/kg
Mixed-layer CIN
-296 J/kg
Mixed-layer LCL
1379 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
241 m²/s²
0-3 km storm-relative helicity
292 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLB 201954 RRA
SVRMLB
FLC093-202055-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
254 PM EST FRI MAR 20 1998

THE NATIONAL WEATHER SERVICE IN MELBOURNE FL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 355 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN EAST CENTRAL FLORIDA

   ...NORTHERN OKEECHOBEE COUNTY
 
AT 250 PM...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER
NORTHWEST OKEECHOBEE COUNTY MOVING EAST-NORTHEAST AT 35 MPH. THIS
THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF OKEECHOBEE COUNTY
THROUGH 345 PM. RESIDENTS OF FT DRUN SHOULD BE ALERT FOR THIS STORM.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 58
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF A STRONG BUILDING. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 20, 2:11 PM ESTSevere Thunderstorm WarningMLBOsceola64 min
Mar 20, 2:49 PM ESTSevere Thunderstorm WarningMLBVolusia61 min
Mar 20, 4:27 PM ESTSevere Thunderstorm WarningMLBSaint Lucie48 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.