Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 29, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at May 6, 1999, 8:58 PM EDT for Orange County, Florida. It was in force for 47 min. 5 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 6, 1999, 8:58 PM EDT (00:58 UTC)
- Expired
- May 6, 1999, 9:45 PM EDT
- In force
- 47 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
County Orange County, FL
The radar
The Melbourne radar (KMLB), 79 km from the middle of the area, began a volume at 01:00 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 |
|---|---|---|---|
| May 6, 9:06 PM EDT | Hail 0.75 | Orlando, FL | |
| May 6, 9:30 PM EDT | Hail 0.75 | Windermere, FL | |
| May 6, 9:30 PM EDT | Thunderstorm Wind 50 | Taft, FL | Trees and power lines were blown down in Taft. Half Dollar size hail was also reported. |
| May 6, 9:45 PM EDT | Hail 0.75 | Orlando, FL | |
| May 6, 9:45 PM EDT | Hail 1.75 | Taft, 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 00:00Z, 1.0 hours before the alert went out and 139 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
- 961 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 1537 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999
WUUS01 KMLB 070056 RRA
SVRMLB
FLC095-070145-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
858 PM EDT THU MAY 6 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
ORANGE COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 945 PM EDT
* AT 900 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER KISSIMMEE. MOVEMENT WAS NORTH AT 10 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
ORLANDO BY 915 PM.
LARGE HAIL IS LIKELY WITH THIS STORM.
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 6, 8:40 PM EDT, 18 minutes earlier.
Area forecast discussion, May 6, 8:40 PM EDT, 18 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 840 PM EDT THU MAY 6 1999 WEST COAST SEA BREEZE INITIATED CONVECTION EARLY THIS EVENING...AND EVENTUAL INTERACTION WITH EAST COAST BREEZE YIELDED SEVERAL LOCALLY SEVERE HAILSTORMS. ACTIVITY BEGINNING TO WEAKEN AT THIS TIME AND WILL REMOVE POPS FROM INLAND AND VOLUSIA COUNTIES LATER THIS EVENING. SKIES CLEARING BY LATE EVENING. MINS OK. MARINE...NO SIGNIFICANT CHANGES ANTICIPATED. .MLB...NONE. SPRATT/KELLY
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 8:05 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 65 min |
| May 6, 9:06 PM EDT | Severe Thunderstorm Warning | MLB | Osceola | 24 min |
| May 6, 9:49 PM EDT | Severe Thunderstorm Warning | MLB | Orange | 31 min |
| May 6, 9:54 PM EDT | Severe Thunderstorm Warning | MLB | Seminole | 46 min |
| May 6, 9:58 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 47 min |
| May 7, 2:40 PM EDT | Severe Thunderstorm Warning | MLB | Lake | 50 min |
| May 7, 3:15 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 50 min |
| May 7, 3:33 PM EDT | Severe Thunderstorm Warning | MLB | Lake | 62 min |
| May 7, 4:05 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 60 min |
| May 7, 4:14 PM EDT | Severe Thunderstorm Warning | MLB | Orange | 31 min |
| May 7, 4:37 PM EDT | Severe Thunderstorm Warning | MLB | Lake | 48 min |
| May 7, 4:43 PM EDT | Severe Thunderstorm Warning | MLB | Orange | 32 min |
| May 7, 5:11 PM EDT | Severe Thunderstorm Warning | MLB | Seminole | 34 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.