Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 98, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Jul 11, 1999, 4:46 PM EDT for Volusia County, Florida. It was in force for 49 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
- Jul 11, 1999, 4:46 PM EDT (20:46 UTC)
- Expired
- Jul 11, 1999, 5:35 PM EDT
- In force
- 49 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 20:45 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, 8.8 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.
- Mixed-layer CAPE
- 215 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 1307 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
483
WUUS01 KMLB 112048
SVRMLB
FLC127-112135-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
446 PM EDT SUN JUL 11 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
VOLUSIA COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 535 PM EDT
* AT 443 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 5 MILES NORTHEAST OF DE LAND. MOVEMENT WAS
SOUTH AT 10 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
WILL MOVE TO JUST EAST OF LAKE HELEN BY 5 PM
AND TO NEAR OSTEEN BY 520 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/WIMMERWhat 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 Jul 11, 2:45 PM EDT, 2 hours 1 minute earlier.
Area forecast discussion, Jul 11, 2:45 PM EDT, 2 hours 1 minute before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 245 PM EDT SUN JUL 11 1999 SURFACE HEATING HAS PLAYED A BIG PART IN THE TWO DIFFERENT AREAS WHERE STORM DEVELOPMENT WAS OCCURRING. THE SPC OUTLOOKED AREA OVER N CENTRAL FL WAS MAIN AREA OF INTEREST AS A TRAILING VORT LOBE OVER N CENTRAL FL AND A MESOSCALE SURFACE BOUNDARY ALONG WITH THE WEST COAST SEA BREEZE HAS ALLOWED FOR A FEW STRONG STORMS TO FORM DURING THE LAST COUPLE OF HOURS. THIS ACTIVITY WILL BE STEERED SLOWLY EAST TO THE COAST. TONIGHT...DIURNAL STORMS TO END WITH DUSK. WEAK SUBSIDENCE IS INDICATED ALOFT IN THE WAKE OF THE AFOREMENTIONED VORT LOBE. THE RIDGE AXIS REMAINS IN PLACE AT SFC ACROSS CENTRAL FL ALLOWING WINDS TO DROP TO CALM UNDER PARTLY CLOUDY SKIES. MONDAY-TUESDAY NIGHT...AXIS OF BROAD DEEP LAYER RIDGE WILL DROP SLOWLY FROM NORTHERN PORTION OF CWA TO SOUTHERN SECTIONS AS A WEAK SURFACE TROUGH REACHES THE SE STATES. DEPTH OF MOIST LAYER WILL GRADUALLY INCREASE OVER CENTRAL FLORIDA...RETURNING DIURNAL CONVECTIVE COVERAGES BACK TO NEAR NORMAL FOR MID JULY. SURFACE FLOW SHOULD REMAIN LIGHT ENOUGH FOR AFTERNOON SEA BREEZES...ESTABLISHING EARLIEST/STRONGEST SOUTH OF THE CAPE. RIDGE AXIS WILL DIVIDE THE CWA NEXT TWO AFTERNOONS WITH STORMS OVER S HALF MOVING INLAND DURING THE AFTERNOON...AND ACTIVITY TO THE NORTH FAVORING THE ATLANTIC COAST BY LATE DAY. ACTIVITY WILL LINGER INTO THE EVENINGS...MAINLY NORTH/CENTRAL AREAS WHERE W STEERING FLOW PREVAILS. MAX TEMPS GENERALLY A CATEGORY ABOVE NORMAL ALONG COAST THROUGH EARLY/MID AFTERNOON...PRIOR TO SEA BREEZE ONSET. WEDNESDAY-FRIDAY...AS AXIS OF BROAD RIDGE SHIFTS SLOWLY BACK TO THE NORTH...DEEPENING SE FLOW BECOMES RE-ESTABLISHED ACROSS THE CWA. MAY BE ENOUGH SOUTHERLY STEERING COMPONENT INITIALLY TO HOLD SOME CONVECTION CLOSE TO THE EAST COAST...HOWEVER TIMING OF ACTIVITY SHOULD FAVOR MORNINGS NEAR THE COAST AND AFTERNOONS OVER THE INTERIOR BY LATE WEEK. DO NOT FORESEE ANY GREATLY ENHANCED MOISTURE SOURCES UPSTREAM...THUS WILL MAINTAIN NEAR CLIMO POPS FOR THE EXTENDED PERIOD. TEMPS ALSO NEAR NORMAL. MARINE...NO HIGHLIGHTS. LIGHT FLOW WILL GIVE WAY TO AFTERNOON SEA BREEZES NEAR SHORE. SCATTERED STORMS WILL MOVE OFFSHORE THE PENINSULA LATE AFTERNOON THROUGH EARLY EVENING...ESPECIALLY N OF VRB. DAB BB 073/092 073/092 073 65243 MCO BB 073/093 073/092 073 65243 MLB BB 075/091 074/091 073 65133 .MLB...NONE. PENDERGRAST/SPRATT
In the hours before
Special weather statement, Jul 11, 2:08 PM EDT, 2 hours 38 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-112000- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MELBOURNE FL 208 PM EDT SUN JUL 11 1999 ...A FEW STRONG TO POSSIBLY SEVERE LIGHTNING STORMS POSSIBLE THIS AFTERNOON... THE COMBINATION OF SURFACE MOISTURE AND HEATING ALONG WITH DRY AIR AT MID LEVELS OF THE ATMOSPHERE WILL ALLOW FOR THE FORMATION OF A FEW STRONG LIGHTNING STORMS MAINLY OVER LAKE...VOLUSIA ...SEMINOLE AND ORANGE COUNTY THROUGH 6 PM. THE MAIN THREAT FROM THE STRONGER ST0RMS THAT DEVELOP WILL BE WIND GUSTS TO 45 MPH ALONG WITH SMALL HAIL AND DANGEROUS LIGHTNING. MOVEMENT WILL BE EAST AT 10 MPH AND THE STORMS WILL AFFECT TEH BEACHES OF VOLUSIA COUNTY TO FLAGLER BEACH LATER THIS AFTERNOON. ELSEWHERE...CONSIDERABLE CLOUDS OVER BREVARD...OSCEOLA AND INDIAN RIVER COUNTY WILL LIMIT THE COVERAGE OF STORMS AND THEY SHOULD REMAIN BELOW SEVERE LIMITS. OVER ST LUCIE... MARTIN AND OKEECHOBEE COUNTIES SCATTERED LIGHTNING STORMS WILL AFFECT THE COASTAL AREAS AS THE ATLANTIC SEABREEZE MOVES INLAND. ALL STORMS WILL BE CAPABLE OF DEADLY LIGHTNING. MOVE INDOORS AT THE FIRST SIGN OF THREATENING SKIES...AND MAKE SURE LIGHTNING IS WELL AWAY FROM YOUR LOCATION BEFORE RESUMING OUTDOOR ACTIVITIES. PENDERGRAST
Special weather statement, Jul 11, 2:08 PM EDT, 2 hours 38 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-112000- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MELBOURNE FL 208 PM EDT SUN JUL 11 1999 ...A FEW STRONG TO POSSIBLY SEVERE LIGHTNING STORMS POSSIBLE THIS AFTERNOON... THE COMBINATION OF SURFACE MOISTURE AND HEATING ALONG WITH DRY AIR AT MID LEVELS OF THE ATMOSPHERE WILL ALLOW FOR THE FORMATION OF A FEW STRONG LIGHTNING STORMS MAINLY OVER LAKE...VOLUSIA ...SEMINOLE AND ORANGE COUNTY THROUGH 6 PM. THE MAIN THREAT FROM THE STRONGER ST0RMS THAT DEVELOP WILL BE WIND GUSTS TO 45 MPH ALONG WITH SMALL HAIL AND DANGEROUS LIGHTNING. MOVEMENT WILL BE EAST AT 10 MPH AND THE STORMS WILL AFFECT TEH BEACHES OF VOLUSIA COUNTY TO FLAGLER BEACH LATER THIS AFTERNOON. ELSEWHERE...CONSIDERABLE CLOUDS OVER BREVARD...OSCEOLA AND INDIAN RIVER COUNTY WILL LIMIT THE COVERAGE OF STORMS AND THEY SHOULD REMAIN BELOW SEVERE LIMITS. OVER ST LUCIE... MARTIN AND OKEECHOBEE COUNTIES SCATTERED LIGHTNING STORMS WILL AFFECT THE COASTAL AREAS AS THE ATLANTIC SEABREEZE MOVES INLAND. ALL STORMS WILL BE CAPABLE OF DEADLY LIGHTNING. MOVE INDOORS AT THE FIRST SIGN OF THREATENING SKIES...AND MAKE SURE LIGHTNING IS WELL AWAY FROM YOUR LOCATION BEFORE RESUMING OUTDOOR ACTIVITIES. PENDERGRAST
Nearby
Severe Thunderstorm Warnings in Florida, 1999Every 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.