Alert archive / Florida / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 73, NWS Melbourne, FL

June 20, 1998Orange County, Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 20, 1998, 7:03 PM EDT for Orange County, Osceola County, Florida. It was in force for 47 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 20, 1998, 7:03 PM EDT (23:03 UTC)
Expired: Jun 20, 1998, 7:50 PM EDT
In force: 47 min
Issued by: NWS Melbourne, FL
Area: Whole counties

Counties Orange County, FL, Osceola County, FL

The radar

The Melbourne radar (KMLB), 60 km from the middle of the area, began a volume at 23:05 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.

What was reported inside it

Time	Report	Where	Remark
Jun 20, 7:15 PM EDT	Hail 0.75	Orlando, FL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 11.1 hours before the alert went out and 132 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1643 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 19 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 KMLB 202303 RRA
SVRMLB
FLC095-097-202350-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
703 PM EDT SAT JUN 20 1998

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
     ORANGE COUNTY IN EAST CENTRAL FLORIDA
     OSCEOLA COUNTY IN EAST CENTRAL FLORIDA

* UNTIL 750 PM EDT

* AT 700...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM NEAR EATONVILLE AND NEAR KISSIMMEE.  MOVEMENT WAS
  SOUTHEAST AT LESS THAN 5 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
    WINTERPARK...ALOMA...KISSIMMEE...AND LAKE TOHO THROUGH 750 PM

ANOTHER STRONG STORM JUST EAST OF THE INTERNATIONAL AIRPORT WILL
AFFECT AREAS AROUND NARCOOSEE AND MAY ALSO BECOME SEVERE.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 58
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN.
MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STRONG BUILDING.

SPRATT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 2:27 PM EDT	Severe Thunderstorm Warning	MLB	Saint Lucie	63 min
Jun 20, 3:34 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	41 min

Nearby

Severe Thunderstorm Warnings in Florida, 1998 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.