Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 95, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Jul 9, 1999, 4:55 PM EDT for Lake County, Orange County, Seminole County, Florida. It was in force for 50 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
- Jul 9, 1999, 4:55 PM EDT (20:55 UTC)
- Expired
- Jul 9, 1999, 5:45 PM EDT
- In force
- 50 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
Counties Lake County, FL, Orange County, FL, Seminole County, FL
The radar
The Melbourne radar (KMLB), 97 km from the middle of the area, began a volume at 21:06 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 |
|---|---|---|---|
| Jul 9, 5:00 PM EDT | Hail 1.75 | Sorrento, 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
Cape Canaveral, FL (KXMR), launched 12:00Z, 8.9 hours before the alert went out and 93 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
- 2444 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 954 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- -6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KMLB 092057
SVRMLB
FLC069-095-117-092145-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
455 PM EDT FRI JUL 9 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN LAKE COUNTY IN EAST CENTRAL FLORIDA
SEMINOLE COUNTY IN EAST CENTRAL FLORIDA
NORTHERN ORANGE COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 545 PM EDT
* AT 455 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM ABOUT 5 MILES NORTHEAST OF ZELLWOOD. MOVEMENT
WAS NORTHEAST AT 5 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
HEATHROW AND WEKIVA SPRINGS BY 515 PM AND DEBARY BY 525 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 Jul 9, 2:55 PM EDT, 2 hours earlier.
Area forecast discussion, Jul 9, 2:55 PM EDT, 2 hours before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 255 PM EDT FRI JUL 9 1999 STORM ACTIVITY INCREASING ALONG BOTH SEA BREEZE FRONTS ATTM. INTERIOR COUNTIES WILL BE THE PRIME FOCUS FOR ADDITIONAL CONVECTION AS THE AFTERNOON PROGRESSES GIVEN INTERACTION OF BOUNDARIES AND VERY UNSTABLE AIRMASS. LOCALLY STRONG STORMS POSSIBLE WITH HEAVY RAIN AND FREQUENT LIGHTNING. DEFLECTION OF STORM TOPS TO THE NORTHEAST ON VISIBLE IMAGERY ARGUES FOR A MOVEMENT OF SCATTERED STORMS TOWARD THE EAST COAST LATER IN THE AFTERNOON AND INTO THE EVENING...ESPECIALLY FOR THE NORTH AND CENTRAL COUNTIES INVOF AND NORTH OF RIDGE AXIS. TONIGHT...LITTLE MOVEMENT IS ADVERTISED WITH THE E-W RIDGE AXIS ACROSS THE CENTER OF THE STATE. WIND WILL DROP TO NEAR CALM A COUPLE HOURS AFTER DARKNESS WITH A FEW LINGERING SHOWERS AND ONLY SCATTERED CLOUDS. SAT-SUN...SUB TROPICAL RIDGE PERSISTS OVER AREA WITH UPPER LEVEL RIDGE BUILDING OVER STATE. SEA BREEZE FORMATION WILL OCCUR FAIRLY EARLY SOUTH OF THE CAPE WITH LIGHT WINDS NEAR RIDGE AXIS AND BE HARDER TO COME BY TO THE N WITH MORE SWLY LOW LEVEL FLOW. SOME DRYING INDICATED OVER SRN PART OF THE STATE TO N OF WWD MOVING TROPICAL WAVE BUT 12Z AVN NOW BACKING OFF ON NWD EXTENT OF DRYING AND WILL HAVE TO WATCH AS THIS EVOLVES...PLAN TO INDICATE DECREASING TREND IN SRN MOST GROUP BUT WILL NOT PLAY UP FOR REST OF AREA. TEMPS ABLE TO REACH MID 90S SOME SPOTS AWAY FROM COAST BOTH DAYS. MON-WED...LOW LEVEL RIDGE WEAKENS AND DRIFTS S AS FRONTAL BOUNDARY STALLS OVER GA. UPPER LEVEL TROFFING OVER ERN STATES AND SCT SHOWERS AND STORMS WILL CONT FOR CWA. MARINE...WINDS MAINLY S TO SW WITH RIDGE AXIS OVER AREA. WINDS INCREASING SLIGHTLY NRN SECTIONS LATE SAT AND SUN AS FRONTAL SYS MOVES INTO SE STATES. NO HIGHLIGHTS. PRELIMINARY NUMBERS... DAB BB 073 093/073 094 52342 MCO BB 074 094/074 095 52342 MLB BB 074 092/074 092 52232 .MLB...NONE. PENDERGRAST/GLITTO
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 4:35 PM EDT | Severe Thunderstorm Warning | MLB | Okeechobee | 45 min |
| Jul 9, 5:30 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 45 min |
| Jul 9, 6:13 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 42 min |
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.