Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 56, NWS Melbourne, FL

May 9, 1999Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 9, 1999, 5:23 PM EDT for Seminole 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: May 9, 1999, 5:23 PM EDT (21:23 UTC)
Expired: May 9, 1999, 6:10 PM EDT
In force: 47 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Seminole County, FL

What was reported inside it

Time	Report	Where	Remark
May 9, 5:30 PM EDT	Hail 1.75	Oviedo, 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, 9.4 hours before the alert went out and 160 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

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, 2 hours 28 minutes earlier.

Area forecast discussion, May 9, 2:55 PM EDT, 2 hours 28 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

Local storm report, May 9, 4:10 PM EDT, 1 hour 13 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, 1 hour 13 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, 4:40 PM EDT, 43 minutes before

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

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

0420 PM    FELLSMERE                 FL   1 INCH HAIL
05/09/99   INDIAN RIVER                   QUARTER HAIL REPORTED BY
                                          SKYWARN SPOTTER.

Local storm report, May 9, 4:40 PM EDT, 43 minutes before

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

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

0420 PM    FELLSMERE                 FL   1 INCH HAIL
05/09/99   INDIAN RIVER                   QUARTER HAIL REPORTED BY
                                          SKYWARN SPOTTER.

Local storm report, May 9, 4:54 PM EDT, 29 minutes before

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

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

0450 PM    PALM BAY                  FL   .75 INCH HAIL
05/09/99   BREVARD                        DIME SIZE HAIL REPORTED BY
                                          SKYWARN SPOTTER.

Local storm report, May 9, 4:54 PM EDT, 29 minutes before

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

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

0450 PM    PALM BAY                  FL   .75 INCH HAIL
05/09/99   BREVARD                        DIME SIZE HAIL REPORTED BY
                                          SKYWARN SPOTTER.

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, 4:27 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	48 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, 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.