Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 79, NWS Melbourne, FL

June 3, 1999Orange County, Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 3, 1999, 5:35 PM EDT for Orange County, Osceola County, Florida. It was in force for 45 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 3, 1999, 5:35 PM EDT (21:35 UTC)
Expired: Jun 3, 1999, 6:20 PM EDT
In force: 45 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 21:35 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 3, 5:35 PM EDT	Hail 1.75	Kissimmee, 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, 9.6 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: 420 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 924 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 3 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.

776 
WUUS01 KMLB 032136 RRA
SVRMLB
FLC095-097-032220-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
535 PM EDT THU JUN 3 1999

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

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

* UNTIL 620 PM EDT

* AT 534 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM JUST WEST OF KISSIMMEE. THE STORM WAS NEARLY
  STATIONARY.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
    THE DISNEY COMPLEX AND EPCOT THROUGH 6 PM.

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.

TROUTMAN

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Melbourne, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 3, 3:25 PM EDT, 2 hours 10 minutes earlier.

Area forecast discussion, Jun 3, 3:25 PM EDT, 2 hours 10 minutes before

EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
325 PM EDT THU JUN 3 1999

CURRENTLY...SHOWERS AND STORMS ARE FIRING OVER INTERIOR SECTIONS.
THEIR SLOW SOUTHWARD MOVEMENT IS LIKELY PRODUCING COPIOUS AMOUNTS OF
RAIN OVER SOUTHERN OSCEOLA COUNTY. EAST COAST SEA BREEZE IS PUSHING
RAPIDLY ACROSS THE PENINSULA...BEING GIVEN AN EXTRA PUSH FROM
THUNDERSTORM OUTFLOW.

TONIGHT...SHOWERS AND STORMS WILL DIMINISH THIS EVENING WITH THE
LOSS OF SOLAR HEATING. SURFACE WINDS SHOULD VEER TO THE SOUTHEAST
AND WEAKEN. MODEL DATA SHOWS BOUNDARY LAYER FLOW WEAKENING AS
WELL...SO DO NOT EXPECT COASTAL SHOWERS OVERNIGHT AND WILL KEEP THEM
OUT OF FORECAST. SURFACE TROUGH OVER THE MID SOUTH WILL SAG
SOUTHEAST OVERNIGHT BUT LOSE ITS MOMENTUM AND UPPER SUPPORT AS H5
SHORT WAVE TROUGH MOVES NE AWAY FROM AREA.

FRI...SHORT RANGE MODELS PUSH THE REALLY DEEP MOISTURE OFFSHORE THE
SE COAST OF FL...LOWERING PWATS BY A COUPLE TENTHS...BUT OVERALL
VALUES STAY PRETTY HEALTHY...ESPECIALLY SOUTH. EXCEPTION IS ETA
WHICH DRIES OVERALL AIR MASS OUT A BIT TOO MUCH. MAIN CHANGE WILL BE
ANTICYCLONIC VORT CENTER OVER PENINSULA...WHICH SHOULD COMBINE WITH
SLIGHTLY DRIER AIR TO KEEP COVERAGE A LITTLE BELOW TODAY. HAVE RE-
INTRODUCED LATE NIGHT COASTAL SHOWERS AS THE SFC-850 RIDGE BUILDS
ALONG THE SE ATLC COAST AND HEIGHTS BEGIN TO FALL SOUTH OF FLORIDA.

SAT...AIR MASS DRIES OUT ANOTHER TENTH OR TWO OVER PENINSULA...BUT
STAYS AROUND 1.4 TO 1.5. H50 VORT PROFILE NEUTRAL TO WEAKLY
POSITIVE...WHICH WOULD FAVOR NUDGING POPS UP A LITTLE.

SUN/MON...AVN MODEL SEEMS TOO AGGRESSIVE WITH SFC TO H50 LOW
DEVELOPMENT OVER THE BAHAMAS (A LA THE W CARIB A FEW WEEKS AGO) .
FAVOR A WEAKER SOLUTION WITH A WEAK INVERTED TROUGH DRAWING MOISTURE
INTO SOUTH FL BUT NOT MUCH FARTHER NORTH. OF COURSE...THIS COULD
CHANGE BASED ON LATER MODEL RUNS...BUT WILL NOT BE TOO GUNG-HO IN
THE EFP FOR NOW.

THANKS FOR COORD MIA.

PRELIM CCF S...
DAB BB 071/088 071/086 075 60222
MCO BB 070/092 070/089 076 60322
MLB BB 073/088 074/085 077 60222

.MLB...NONE.

KELLY/CRISTALDI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 6:08 PM EDT	Severe Thunderstorm Warning	MLB	Lake	32 min
Jun 3, 6:51 PM EDT	Severe Thunderstorm Warning	MLB	Lake	49 min

Nearby

Severe Thunderstorm Warnings in Florida, 1999 Every severe thunderstorm warning in 1999

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.