Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 53, NWS Melbourne, FL

May 9, 1999Brevard County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 9, 1999, 4:27 PM EDT for Brevard County, Florida. It was in force for 48 min. 2 reports 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: May 9, 1999, 4:27 PM EDT (20:27 UTC)
Expired: May 9, 1999, 5:15 PM EDT
In force: 48 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Brevard County, FL

What was reported inside it

Time	Report	Where	Remark
May 9, 4:50 PM EDT	Hail 0.75	Palm Bay, FL
May 9, 5:14 PM EDT	Hail 0.75	Merritt Is, 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, 8.5 hours before the alert went out and 180 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: 929 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1185 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 16 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 092027 RRA
SVRMLB
FLC009-092115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
427 PM EDT SUN MAY 9 1999

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

     BREVARD COUNTY IN EAST CENTRAL FLORIDA

* UNTIL 515 PM EDT

* AT 425 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR PALM BAY.  MOVEMENT WAS SLOWLY EAST AT 5
  TO 10 MPH. OTHER SEVERE STORMS CONTINUED NEAR PINEDA.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

    MALABAR BY 435 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.

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 May 9, 2:55 PM EDT, 1 hour 32 minutes earlier.

Area forecast discussion, May 9, 2:55 PM EDT, 1 hour 32 minutes before

EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
255 PM EDT SUN MAY 9 1999

CURRENTLY...A FEW STRONG TO SEVERE TSTMS STARTING TO INFRINGE UPON
EC FL AND SRN HALF OF CWA IN A SVR TSTM WATCH THROUGH 8 PM. STORMS
WILL MOVE TOWARD E COAST THROUGH LATE AFTERNOON AND INCREASE AS SEA
BREEZE BOUNDARIES INTERACT. A FEW STORMS ALSO DEVELOPING OVER NRN
SECTIONS ALONG REMNANTS OF FRONTAL BOUNDARY BUT WITH LOWER DEW
POINTS FILTERING INTO THIS REGION AM THINKING COVERAGE OF STORMS
WILL STAY LOWER THERE.

TONIGHT...STORMS WILL LINGER INTO WELL EVE HOURS AS THEY MOVE TOWARD
E COAST. PATCHY FOG POSSIBLE LATE NIGHT AS CLOUDS DECREASE AND WINDS
GO LIGHT...ESPECIALLY AREAS THAT RECEIVE RAIN TODAY.

MON...SHORT WAVE TROUGH DROPS THROUGH SOUTHEAST AND BECOMES CUTOFF
MON NIGHT. COLD POOL OF AIR AT 500MB...STEEP LAPSE RATES COMBINING
WITH LOW LEVEL MOISTURE AND SEA BREEZE FOCUSING WARRANT GOING A
LITTLE ABOVE GUIDANCE POPS FOR THUNDERSTORMS. SET UP LOOKS GOOD FOR
MAINLY HAIL AND WIND EVENTS.

TUE THROUGH FRI...AVN/MRF CUT OFF SHORT WAVE VICINITY OF PENINSULA
WITH 500MB TEMPERATURES AVERAGING -10/12 C OR LESS SHOULD HELP TO
KEEP LAPSE RATES FAIRLY STEEP THROUGH THE PERIOD. HIGH PRESSURE
RIDGE ACROSS CENTRAL FL SHOULD KEEP WINDS LIGHT AND FROM THE EAST
TUE AND WED. WINDS BECOME MORE SOUTHERLY THU AND FRI AS INVERTED
TROUGH DEVELOPS LATE WED. GUIDANCE TEMPS OK. PREFER GOING ABOVE
GUIDANCE ON POPS...MRF POPS LOOK MORE REALISTIC GIVEN WEATHER
PATTERN.

MARINE...WEAK SURFACE HIGH RIDGES ACROSS THE BAHAMAS...FL AND INTO
GA/AL. AVN/MRF DEVELOPS AN INVERTED TROUGH ALONG FL EAST COAST LATE
WED. WINDS GENERALLY 15 KT OR LESS.

PRELIM NUMBERS

DAB BB 063/086 064/084 064 67322
MCO BB 065/089 063/087 064 67332
MLB BB 065/088 066/085 065 67333

.MLB...NONE.

GLITTO/WIMMER

In the hours before

Special weather statement, May 9, 11:24 AM EDT, 5 hours 3 minutes before

AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-092000-

EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
1124 AM EDT SUN MAY 9 1999

...SCATTERED AFTERNOON AND EVENING LIGHTNING STORMS WITH A FEW
STRONG TO SEVERE STORMS POSSIBLE...

AFTERNOON HEATING COMBINED WITH AN UNSTABLE AIR MASS AND SEA BREEZE
BOUNDARIES WILL ALLOW SCATTERED LIGHTNING STORMS TO FORM AGAIN OVER
EAST CENTRAL FLORIDA. A FEW STORMS MAY BEGIN TO DEVELOP DURING THE
EARLY AFTERNOON...BUT THE HIGHEST COVERAGE OF STORMS IS EXPECTED TO
BE SOUTH OF CAPE CANAVERAL AND ORLANDO DURING THE LATE AFTERNOON AND
EARLY EVENING HOURS.

THE MAIN THREATS WITH STRONGER STORMS WILL BE FREQUENT LIGHTNING...
LARGE HAIL AND DAMAGING WIND GUSTS. DUE TO THE SLOW MOVEMENT OF SOME
STORMS...LOCALLY HEAVY RAIN WILL BE POSSIBLE...WHICH CAN CAUSE
PONDING OF WATER ON ROADS AND IN LOW LYING AREAS.

IF YOU PLAN TO BE OUTDOORS...BE PREPARED TO MOVE INDOORS AT THE
FIRST SIGN OF AN APPROACHING STORM. MARINE INTERESTS SHOULD SEEK HARBOR
BEFORE A STORM IS OVERHEAD. SKYWARN SPOTTER NETWORKS ARE REQUESTED
TO SELF ACTIVATE IF A WARNING IS ISSUED FOR THEIR COUNTY.

GLITTO

Special weather statement, May 9, 1:45 PM EDT, 2 hours 42 minutes before

AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-100000-

EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
145 PM EDT SUN MAY 9 1999

...SEVERE THUNDERSTORM WATCH UNTIL 800 PM FOR OSCEOLA...
OKEECHOBEE...BREVARD...INDIAN RIVER...ST LUCIE AND MARTIN COUNTIES...

AFTERNOON HEATING COMBINED WITH A VERY UNSTABLE AIR MASS AND SEA
BREEZE BOUNDARIES WILL CONTINUE THUNDERSTORM DEVELOPMENT THROUGH THE
AFTERNOON AND INTO THE EVENING HOURS. AS STORMS CONTINUE TO
INTENSIFY THIS AFTERNOON... SEVERE STORMS WILL BE POSSIBLE...
ESPECIALLY OVER AREAS SOUTH OF ORLANDO AND CAPE CANAVERAL.

THE MAIN THREATS FROM SEVERE STORMS WILL BE LARGE HAIL AND DAMAGING
WIND GUSTS. ADDITIONALLY...FREQUENT TO EXCESSIVE LIGHTNING AND VERY
HEAVY RAIN WILL BE POSSIBLE. RAINFALL AMOUNTS OF AROUND TWO INCHES
MAY OCCUR IN A SHORT PERIOD OF TIME...WHICH CAN CAUSE PONDING OF
WATER ON ROADS AND IN LOW LYING AREAS.

PERSONS SHOULD BE PREPARED TO GO TO A PLACE OF SAFETY IMMEDIATELY IF
A STORM APPROACHES. SKYWARN SPOTTER NETWORKS ARE REQUESTED TO SELF
ACTIVATE IF A WARNING IS ISSUED FOR THEIR COUNTY.

GLITTO

Special weather statement, May 9, 1:45 PM EDT, 2 hours 42 minutes before

AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-100000-

EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
145 PM EDT SUN MAY 9 1999

...SEVERE THUNDERSTORM WATCH UNTIL 800 PM FOR OSCEOLA...
OKEECHOBEE...BREVARD...INDIAN RIVER...ST LUCIE AND MARTIN COUNTIES...

AFTERNOON HEATING COMBINED WITH A VERY UNSTABLE AIR MASS AND SEA
BREEZE BOUNDARIES WILL CONTINUE THUNDERSTORM DEVELOPMENT THROUGH THE
AFTERNOON AND INTO THE EVENING HOURS. AS STORMS CONTINUE TO
INTENSIFY THIS AFTERNOON... SEVERE STORMS WILL BE POSSIBLE...
ESPECIALLY OVER AREAS SOUTH OF ORLANDO AND CAPE CANAVERAL.

THE MAIN THREATS FROM SEVERE STORMS WILL BE LARGE HAIL AND DAMAGING
WIND GUSTS. ADDITIONALLY...FREQUENT TO EXCESSIVE LIGHTNING AND VERY
HEAVY RAIN WILL BE POSSIBLE. RAINFALL AMOUNTS OF AROUND TWO INCHES
MAY OCCUR IN A SHORT PERIOD OF TIME...WHICH CAN CAUSE PONDING OF
WATER ON ROADS AND IN LOW LYING AREAS.

PERSONS SHOULD BE PREPARED TO GO TO A PLACE OF SAFETY IMMEDIATELY IF
A STORM APPROACHES. SKYWARN SPOTTER NETWORKS ARE REQUESTED TO SELF
ACTIVATE IF A WARNING IS ISSUED FOR THEIR COUNTY.

GLITTO

Local storm report, May 9, 4:10 PM EDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
410 PM EDT SUN MAY 09 1999

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

0252 PM    PALM CITY                 FL   .75 INCH HAIL
05/09/99   MARTIN                         DIME SIZE HAIL WEST OF
                                          PALM CITY

0255 PM    INDIANTOWN                FL   WIND DAMAGE
05/09/99   MARTIN                         ESTIMATED WINDS OF 60 MPH
                                          BY STORM SPOTTER

0259 PM    PORT ST LUCIE             FL   1.75 INCH HAIL
05/09/99   ST LUCIE                       GOLFBALL SIZE HAIL IN PORT
                                          ST LUCIE

0310 PM    ORANGE CITY               FL   1.75 INCH HAIL
05/09/99   VOLUSIA                        GOLF BALL SIZE HAIL IN
                                          ORANGE CITY

0335 PM    VERO BEACH                FL   .75 INCH HAIL
05/09/99   INDIAN RIVER                   DIME SIZE HAIL JUST SOUTH
                                          OF VERO BEACH ALONG I-95

0355 PM    SEBASTIAN                 FL   1.75 INCH HAIL
05/09/99   INDIAN RIVER                   GOLF BALL SIZE HAIL AT
                                          SEBASTIAN

0358 PM    SEBASTIAN                 FL   1 INCH HAIL
05/09/99   INDIAN RIVER                   QUARTER SIZE HAIL COVERING
                                          GROUND IN SEBASTIAN

0359 PM                              FL   1 INCH HAIL
05/09/99   OKEECHOBEE                     DIME TO QUARTER SIZE HAIL
                                          IN FORT DRUM

0400 PM                              FL   1.5 INCH HAIL
05/09/99   OKEECHOBEE                     WALNUT SIZE HAIL JUST WEST
                                          OF FORT DRUM

Local storm report, May 9, 4:10 PM EDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
410 PM EDT SUN MAY 09 1999

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

0252 PM    PALM CITY                 FL   .75 INCH HAIL
05/09/99   MARTIN                         DIME SIZE HAIL WEST OF
                                          PALM CITY

0255 PM    INDIANTOWN                FL   WIND DAMAGE
05/09/99   MARTIN                         ESTIMATED WINDS OF 60 MPH
                                          BY STORM SPOTTER

0259 PM    PORT ST LUCIE             FL   1.75 INCH HAIL
05/09/99   ST LUCIE                       GOLFBALL SIZE HAIL IN PORT
                                          ST LUCIE

0310 PM    ORANGE CITY               FL   1.75 INCH HAIL
05/09/99   VOLUSIA                        GOLF BALL SIZE HAIL IN
                                          ORANGE CITY

0335 PM    VERO BEACH                FL   .75 INCH HAIL
05/09/99   INDIAN RIVER                   DIME SIZE HAIL JUST SOUTH
                                          OF VERO BEACH ALONG I-95

0355 PM    SEBASTIAN                 FL   1.75 INCH HAIL
05/09/99   INDIAN RIVER                   GOLF BALL SIZE HAIL AT
                                          SEBASTIAN

0358 PM    SEBASTIAN                 FL   1 INCH HAIL
05/09/99   INDIAN RIVER                   QUARTER SIZE HAIL COVERING
                                          GROUND IN SEBASTIAN

0359 PM                              FL   1 INCH HAIL
05/09/99   OKEECHOBEE                     DIME TO QUARTER SIZE HAIL
                                          IN FORT DRUM

0400 PM                              FL   1.5 INCH HAIL
05/09/99   OKEECHOBEE                     WALNUT SIZE HAIL JUST WEST
                                          OF FORT DRUM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 8:26 PM EDT	Severe Thunderstorm Warning	MLB	Saint Lucie	49 min
May 9, 2:30 PM EDT	Severe Thunderstorm Warning	MLB	Martin	45 min
May 9, 2:59 PM EDT	Severe Thunderstorm Warning	MLB	Saint Lucie	61 min
May 9, 3:20 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	60 min
May 9, 3:32 PM EDT	Severe Thunderstorm Warning	MLB	Indian River	63 min
May 9, 3:52 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	58 min
May 9, 4:36 PM EDT	Severe Thunderstorm Warning	MLB	Volusia	64 min
May 9, 5:21 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	29 min
May 9, 5:23 PM EDT	Severe Thunderstorm Warning	MLB	Seminole	47 min
May 9, 6:16 PM EDT	Severe Thunderstorm Warning	MLB	Orange	59 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.