Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 92, NWS Melbourne, FL

June 13, 1999Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 13, 1999, 5:15 PM EDT for Volusia County, Florida. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 13, 1999, 5:15 PM EDT (21:15 UTC)
Expired: Jun 13, 1999, 6:00 PM EDT
In force: 45 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 116 km from the middle of the area, began a volume at 21:16 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 9.3 hours before the alert went out and 168 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: 673 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 769 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 10 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.

164 
WUUS01 KMLB 132117 RRA
SVRMLB
FLC127-132200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
515 PM EDT SUN JUN 13 1999

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
     VOLUSIA COUNTY IN EAST CENTRAL FLORIDA

* UNTIL 600 PM EDT

* AT 515 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM JUST EAST OF DE LEON SPRINGS.  THE
  STORM WAS DRIFTING SOUTH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
    DE LEON SPRINGS AND DE LAND NEAR HIGHWAY 17
    LAKE HELEN


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

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 13, 2:45 PM EDT, 2 hours 30 minutes earlier.

Area forecast discussion, Jun 13, 2:45 PM EDT, 2 hours 30 minutes before

EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
245 PM EDT SUN JUN 13 1999

MID LEVEL WRMING IN PROXIMITY TO H7 RIDGE AXIS HAS REDUCED
CONVECTIVE DEVELOPMENT SO FAR. PCP WATER VALUES STILL REMAIN QUITE
HIGH NEAR 1.9 IN 15Z CAPE SNDG.

TONIGHT...THE BEST COVERAGE OF STORMS SHOULD BE OVER INTERIOR
OF FA LATE THIS AFTERNOON WHERE WEST AND EAST COAST SEA BREEZES
MEET...THEN STORMS SHOULD DRIFT TO THE N THROUGH EARLY EVENING.
BNDRY LYR WINDS THRU 10 KFT ARE NEARLY PARALLEL TO THE COAST AND
COASTAL LOCATIONS SHUD NOT SEE QUITE AS MUCH ACTVTY AS PAST DAYS.

MON...BROAD SFC RIDGE OVER THE WRN ATLC IS FCST TO HAVE AXIS JUST N
OF FCST AREA. MDLS SHOW SOME DRYING AS A RESULT OF H7 RIDGE RIGHT
THRU THE CENTRAL PART OF THE PENINSULA. THIS IS SIMILAR TO TODAY AND
THUS FAR HAS REDUCED COVERAGE OF ACTVTY. IN ADDITION MDL SNDGS SHOW
ENOUGH MID LEVEL WRMING ASSTD WITH THIS RIDGE TO GO BLO GUIDANCE FOR
POPS. SE-S FLOW AROUND THE BROAD SFC RIDGE AXIS WILL FURTHER REDUCE
SIGNIFICANT CONV ALONG ECSB BNDRY.

TUE...MDLS HAVE BACKED OFF ON STRENGTH OF SHRT WV AND ASSTD FNTL
BNDRY APPROACHING FM THE N. STILL WNDS VEER IN N PORTIONS OF FA TO
SW AND SHUD KEEP ACTVTY CLOSER TO THE COAST. UNABLE TO COMPARE FAN
GUIDANCE AS UNAVAIL ATTM BUT LOWERING HEIGHTS SHUD INCREASE SHRA/TS
COVERAGE AS WELL.

PRELIM NUMBERS...
DAB BB 071/088 071/088 071 05232
MCO BB 071/090 071/090 071 05232
MLB BB 074/087 074/088 072 05232

.MLB...NONE.

BORZILLERI/BLOTTMAN

In the hours before

Special weather statement, Jun 13, 11:16 AM EDT, 5 hours 59 minutes before

AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-132200-

EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
1116 AM EDT SUN JUN 13 1999

...SCATTERED LIGHTNING STORMS...SOME STRONG WITH LOCALLY HEAVY
RAINFALL...

...RIP CURRENT THREAT INCREASING ALONG THE EAST FLORIDA BEACHES
TODAY...

DAYTIME HEATING WILL COMBINE WITH ABUNDANT ATMOSPHERIC MOISTURE TO
PRODUCE SCATTERED LIGHTNING STORMS ACROSS THE AREA ONCE AGAIN TODAY.
THE EAST COAST SEA BREEZE WILL FORM SHORTLY BEFORE NOON AND MOVE
INLAND. AS IT DOES...LIGHTNING STORMS WILL BEGIN TO DEVELOP IN THE
COASTAL COUNTIES. STORM COVERAGE AND INTENSITY WILL INCREASE AND
SHIFT TOWARDS THE INTERIOR COUNTIES BY MID TO LATE AFTERNOON. STORMS
WILL MOVE SLOWLY BACK TOWARDS THE COASTAL COUNTIES WHERE THEY WILL
LINGER INTO THE EVENING HOURS.

STORM MOTION WILL BE GENERALLY NORTHEAST AT 5 TO 10 MPH. DUE TO
THE SLOW MOVEMENT...RAINFALL TOTALS BETWEEN ONE AND TWO INCHES WILL
BE POSSIBLE WITH ISOLATED AMOUNTS AROUND THREE INCHES. FLOODING OF
STREETS AND POOR DRAINAGE AREAS WILL BE POSSIBLE.

ALL STORMS WILL BE CAPABLE OF PRODUCING DEADLY CLOUD TO GROUND
LIGHTNING. THE STRONGER STORMS MAY PRODUCE SMALL HAIL AND WIND GUSTS
TO AROUND 30 MPH. MOVE INDOORS AT ONCE IF SKIES LOOK THREATENING. DO
NOT WAIT UNTIL YOU SEE LIGHTNING OR HEAR THUNDER.

A COMINATION OF A LONG PERIOD SWELL CREATED BY TROPICAL STORM
ARLENE AND A SOUTHEASTERLY WIND WILL PRODUCE A CHANCE OF RIP CURRENTS
AT THE ATLANTIC BEACHES TODAY. CONTACT LOCAL BEACH PATROLS FOR
FURTHER INFORMATION AND REMEMBER TO ALWAYS SWIM NEAR LIFEGUARDS.

BORZILLERI

Special weather statement, Jun 13, 11:16 AM EDT, 5 hours 59 minutes before

AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-132200-

EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
1116 AM EDT SUN JUN 13 1999

...SCATTERED LIGHTNING STORMS...SOME STRONG WITH LOCALLY HEAVY
RAINFALL...

...RIP CURRENT THREAT INCREASING ALONG THE EAST FLORIDA BEACHES
TODAY...

DAYTIME HEATING WILL COMBINE WITH ABUNDANT ATMOSPHERIC MOISTURE TO
PRODUCE SCATTERED LIGHTNING STORMS ACROSS THE AREA ONCE AGAIN TODAY.
THE EAST COAST SEA BREEZE WILL FORM SHORTLY BEFORE NOON AND MOVE
INLAND. AS IT DOES...LIGHTNING STORMS WILL BEGIN TO DEVELOP IN THE
COASTAL COUNTIES. STORM COVERAGE AND INTENSITY WILL INCREASE AND
SHIFT TOWARDS THE INTERIOR COUNTIES BY MID TO LATE AFTERNOON. STORMS
WILL MOVE SLOWLY BACK TOWARDS THE COASTAL COUNTIES WHERE THEY WILL
LINGER INTO THE EVENING HOURS.

STORM MOTION WILL BE GENERALLY NORTHEAST AT 5 TO 10 MPH. DUE TO
THE SLOW MOVEMENT...RAINFALL TOTALS BETWEEN ONE AND TWO INCHES WILL
BE POSSIBLE WITH ISOLATED AMOUNTS AROUND THREE INCHES. FLOODING OF
STREETS AND POOR DRAINAGE AREAS WILL BE POSSIBLE.

ALL STORMS WILL BE CAPABLE OF PRODUCING DEADLY CLOUD TO GROUND
LIGHTNING. THE STRONGER STORMS MAY PRODUCE SMALL HAIL AND WIND GUSTS
TO AROUND 30 MPH. MOVE INDOORS AT ONCE IF SKIES LOOK THREATENING. DO
NOT WAIT UNTIL YOU SEE LIGHTNING OR HEAR THUNDER.

A COMINATION OF A LONG PERIOD SWELL CREATED BY TROPICAL STORM
ARLENE AND A SOUTHEASTERLY WIND WILL PRODUCE A CHANCE OF RIP CURRENTS
AT THE ATLANTIC BEACHES TODAY. CONTACT LOCAL BEACH PATROLS FOR
FURTHER INFORMATION AND REMEMBER TO ALWAYS SWIM NEAR LIFEGUARDS.

BORZILLERI

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.