Alert archive / Florida / Tornado Warnings in 1999

Tornado Warning 6, NWS Melbourne, FL

April 28, 1999Osceola County, Florida

NWS Melbourne, FL issued this tornado warning at Apr 28, 1999, 7:02 PM EDT for Osceola County, Florida. It was in force for 33 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: Apr 28, 1999, 7:02 PM EDT (23:02 UTC)
Expired: Apr 28, 1999, 7:35 PM EDT
In force: 33 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 49 km from the middle of the area, began a volume at 23:03 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
Apr 28, 7:02 PM EDT	Thunderstorm Wind 50	St Cloud, FL	Thunderstorm winds blew down trees and power lines and damaged two mobile homes near St. Cloud.

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, 11.0 hours before the alert went out and 129 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: 1203 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 869 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 12 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 282300 RRA
TORMLB
FLC097-282335-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
702 PM EDT WED APR 28 1999

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* TORNADO WARNING FOR...
     NORTHERN OSCEOLA COUNTY IN EAST CENTRAL FLORIDA

* UNTIL 735 PM EDT

* AT 7 PM... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR ST CLOUD.
  MOVEMENT WAS SOUTHEAST AT 15 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  THE STORM WILL MOVE SOUTHEAST ALONG 192 TOWARD HOLOPAW.


IF YOU ARE IN THE PATH OF A TORNADO...ABANDON CARS AND MOBILE
HOMES FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.
THE SAFEST PLA
CE IS AN INTERIOR ROOM SUCH AS A CLOSET ON THE LOWEST
FLOOR OF A STRONG BUILDING. AVOID WINDOWS.

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Apr 28, 4:08 PM EDT, 2 hours 54 minutes earlier.

Area forecast discussion, Apr 28, 4:08 PM EDT, 2 hours 54 minutes before

EAST CENTRAL FLORIDA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE MELBOURNE FL
330 PM EDT WED APR 28 1999

CURRENTLY...H50 VORT MAX OVER FL PEN SPARKING WIDESPREAD CONVECTION
ACROSS CWA. OUTFLOW BOUNDARY FROM SRN CONVECTION INTERACTING WITH
WCSB TO SEND DEVELOPING TSTMS OVER NRN CWA THROUGH THE ROOF.  TEMPS
MUCH COOLER THAN EXPECTED DUE TO DENSE CLOUD SHIELD.

TONIGHT/THU...H85-H25 OMEGA BLOCK WILL DEVELOP OVER CENTRAL U.S.
THROUGH 12Z THU.  H25 JET MAX OVER LOWER MS VALLEY WILL DRIFT SE
UNDER THE RESULTING WIND FLOW...CAUSING THE LOW CENTER NEAR THE
APPALACHAIN TO FILL AND ALLOWING A WK LOW OVER THE SW ATLC TO
DEVELOP.  UNDER THIS MOTION...THE BACKDOOR FRONT OVER SC/GA WILL
COUPLE WITH THE LATE SEASON COLD FRONT IN THE NORTH GULF REGION AND
THEN DRIFT INTO THE NRN FL PEN.  SFC WINDS TO TURN W TO NW THORUGH
00Z FRI AS THE FRONT DRIFTS TOWARD THE AREA.  H70 OMEGA...H50
VORT...AND H25 JET DYNAMICS ARE MARGINAL THROUGH 00Z FRI...BUT RH
VALUES WILL REMAIN HIGH ENOUGH FOR MESO SCALE FEATURES TO TRIGGER
PRECIP.

SCT TO GOOD CHANCE POPS LOOK BEST...WITH HIGHER NUMBERS ALONG THE
COAST. PATCHY LATE NIGHT/EARLY MORNING FOG WILL ALSO BE MENTIONED
TONIGHT AS WINDS BECOMING LIGHT OVERNIGHT. AREAS WHICH RECEIVED SOME
BENEFICIAL RAINS TODAY ARE MOST LIKELY TO SEE FOG/STRATUS.

FRI...INTERESTING DAY WITH TEMPS ALOFT COOLING ANOTHER COUPLE DEG AS
UPPER LOW DRIFTS ESE. EXPECT 500 TEMPS -14 TO -15C WITH RESIDUAL
MOISTURE AHEAD OF SOUTHWARD SAGGING FRONTAL BOUNDARY. WILL KEEP
POPS IN SCT CATEGORY.

SAT-MON...DRY THROUGH THE PERIOD WITH TEMPS AT OR SLIGHTLY BELOW
CLIMO...WARMING BY MON.

MARINE...UNEVENTFUL OUTSIDE OF TSTMS/OUTFLOWS. LATE 3RD PD COULD SEE
WINDS/SEAS PICK UP...ESP FLG-COF LEG DEPENDING ON INTENSITY OF
OFFSHORE LOW.

.MLB...NONE.

CCF NUMBERS...
DAB TB 066/087 064/079 057 60352
MCO BB 066/089 064/084 060 60242
MLB TB 067/088 066/082 060 60353

BRAGAW/CRISTALDI

In the hours before

Local storm report, Apr 28, 4:07 PM EDT, 2 hours 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
407 PM EDT WED APR 28 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0150 PM    ORLANDO INTL ARPT         FL   1.75 INCH HAIL
04/28/99   ORANGE                         GOLF BALL SIZE HAIL WAS
                                          REPORTED JUST SOUTHEAST OF
                                          ORLANDO INTERNATIONAL
                                          AIRPORT.

0205 PM    DAYTONA BEACH             FL   TSTM WIND
04/28/99   VOLUSIA                        THE PUBLIC REPORTED TWO
                                          TREES BLOWN DOWN IN
                         DAYTONA BEACH.

0320 PM    ORLANDO                   FL   1 INCH HAIL
04/28/99   ORANGE                         QUARTER SIZE HAIL WAS
                                          REPORTED BY ORANGE COUNTY
                                          SKYWARN.

Local storm report, Apr 28, 4:07 PM EDT, 2 hours 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
407 PM EDT WED APR 28 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0150 PM    ORLANDO INTL ARPT         FL   1.75 INCH HAIL
04/28/99   ORANGE                         GOLF BALL SIZE HAIL WAS
                                          REPORTED JUST SOUTHEAST OF
                                          ORLANDO INTERNATIONAL
                                          AIRPORT.

0205 PM    DAYTONA BEACH             FL   TSTM WIND
04/28/99   VOLUSIA                        THE PUBLIC REPORTED TWO
                                          TREES BLOWN DOWN IN
                         DAYTONA BEACH.

0320 PM    ORLANDO                   FL   1 INCH HAIL
04/28/99   ORANGE                         QUARTER SIZE HAIL WAS
                                          REPORTED BY ORANGE COUNTY
                                          SKYWARN.

Local storm report, Apr 28, 6:38 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT...UPDATED
NATIONAL WEATHER SERVICE MELBOURNE FL
638 PM EDT WED APR 28 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0150 PM    ORLANDO INTL ARPT         FL   1.75 INCH HAIL
04/28/99   ORANGE                         GOLF BALL SIZE HAIL WAS
                                          REPORTED JUST SOUTHEAST OF
                                          ORLANDO INTERNATIONAL
                                          AIRPORT.

0205 PM    DAYTONA BEACH             FL   TSTM WIND
04/28/99   VOLUSIA                        THE PUBLIC REPORTED TWO
                                          TREES BLOWN DOWN
                                          IN DAYTONA BEACH.

0320 PM    ORLANDO                   FL   1 INCH HAIL
04/28/99   ORANGE                         QUARTER SIZE HAIL WAS
                                          REPORTED BY ORANGE COUNTY
                                          SKYWARN.

0455 PM    ALTOONA                   FL   TSTM WIND
04/28/99   LAKE                           NUMEROUS TREES DOWN
                                          REPORTED BY U.S.
                                          FOREST SERVICE PERSONNEL.

Local storm report, Apr 28, 6:38 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT...UPDATED
NATIONAL WEATHER SERVICE MELBOURNE FL
638 PM EDT WED APR 28 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0150 PM    ORLANDO INTL ARPT         FL   1.75 INCH HAIL
04/28/99   ORANGE                         GOLF BALL SIZE HAIL WAS
                                          REPORTED JUST SOUTHEAST OF
                                          ORLANDO INTERNATIONAL
                                          AIRPORT.

0205 PM    DAYTONA BEACH             FL   TSTM WIND
04/28/99   VOLUSIA                        THE PUBLIC REPORTED TWO
                                          TREES BLOWN DOWN
                                          IN DAYTONA BEACH.

0320 PM    ORLANDO                   FL   1 INCH HAIL
04/28/99   ORANGE                         QUARTER SIZE HAIL WAS
                                          REPORTED BY ORANGE COUNTY
                                          SKYWARN.

0455 PM    ALTOONA                   FL   TSTM WIND
04/28/99   LAKE                           NUMEROUS TREES DOWN
                                          REPORTED BY U.S.
                                          FOREST SERVICE PERSONNEL.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 1:48 PM EDT	Severe Thunderstorm Warning	MLB	Orange	42 min
Apr 28, 2:44 PM EDT	Severe Thunderstorm Warning	MLB	Orange	46 min
Apr 28, 4:39 PM EDT	Severe Thunderstorm Warning	MLB	Volusia	61 min
Apr 28, 4:45 PM EDT	Severe Thunderstorm Warning	MLB	Lake	60 min

Nearby

Tornado Warnings in Florida, 1999 Every tornado warning in 1999 Tornadoes 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.