Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 32, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at May 6, 1999, 9:54 PM EDT for Seminole County, Florida. It was in force for 46 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
- May 6, 1999, 9:54 PM EDT (01:54 UTC)
- Expired
- May 6, 1999, 10:40 PM EDT
- In force
- 46 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
County Seminole County, FL
The radar
The Melbourne radar (KMLB), 88 km from the middle of the area, began a volume at 01:55 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
Tampa Bay, FL (KTBW), launched 00:00Z, 1.9 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.
- 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.
000
TTAA00 KMLB 070152 RRA
SVRMLB
FLC117-070240-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
954 PM EDT THU MAY 6 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SEMINOLE COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 1040 PM EDT
* AT 955 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER WINTER PARK. MOVEMENT WAS NORTHEAST AT 15
MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
OVIEDO BY 1000 PM
DIME SIZE HAIL IS LIKELY WITH THIS STORM.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 58
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN.
MxOVE 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, 1 hour 14 minutes earlier.
Area forecast discussion, May 6, 8:40 PM EDT, 1 hour 14 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, 8:58 PM EDT | Severe Thunderstorm Warning | MLB | Orange | 47 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, 9:58 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.