Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 16, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Apr 28, 1999, 2:44 PM EDT for Orange County, Florida. It was in force for 46 min. 2 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
- Apr 28, 1999, 2:44 PM EDT (18:44 UTC)
- Expired
- Apr 28, 1999, 3:30 PM EDT
- In force
- 46 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 18:44 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 |
|---|---|---|---|
| Apr 28, 3:00 PM EDT | Hail 1 | Windermere, FL | |
| Apr 28, 3:20 PM EDT | Hail 1 | Orlando, 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 12:00Z, 6.7 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
- 1203 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 12 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 281842
SVRMLB
FLC095-281930-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
244 PM EDT WED APR 28 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
ORANGE COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 330 PM EDT
* AT 345 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER THE GERATER ORLANDO AREA. MOVEMENT WAS
EAST AT 20 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
WINDERMER AT 3 PM AND ORLANDO BY 315 PM
THIS IS A DANGEROUS STORM. BE PREPARED FOR DAMAGING WIND IN EXCESS
OF 58 MPH...LARGE HAIL AND DEADLY LIGHTNING. PEOPLE OUTSIDE OR IN
MOBILE HOMES SHOULD MOVE INSIDE A STRONG BUILDING AND STAY AWAY FROM
WINDOWS.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 Apr 28, 10:30 AM EDT, 4 hours 14 minutes earlier.
Area forecast discussion, Apr 28, 10:30 AM EDT, 4 hours 14 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 1030 AM EDT WED APR 28 1999 SQUALL LINE EXTENDING FROM LAKE OKEE NE INTO COASTAL WATERS SHOWING SIGNS OF WEAKENING. STRONG OUTFLOW BOUNDARY FROM COLLAPSING TSTMS MOVING NORTH UP THE PENINSULA WILL HELP ENHANCE LOW LVL CONV WITH THE WCSB FROM BREVARD NORTHWARD. DEW POINTS IN THE MID 60S TO LOW 70S...AND DECENT INSTABILITY PARAMETERS. COORD WITH KTPA...WILL INCREASE POPS OVER NRN CWA. MAY LOWER POPS OVER SRN CWA DUE TO CI SHIELD AND THE RAIN COOLED AIR. MARINE...NO CHANGES ATTM. .MLB...NONE. BRAGAW/CRISTALDI
In the hours before
Special weather statement, Apr 28, 11:25 AM EDT, 3 hours 19 minutes before
AMZ550-555-FLZ041-044>047-053-054-058-059-064-281725- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1125 AM EDT WED APR 28 1999 ...A FEW SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING... SUFFICIENT MOISTURE WILL COMBINE WITH A MODERATELY UNSTABLE ATMOSPHERE AND SEA BREEZES TO PRODUCE SOME MUCH NEEDED RAIN THIS AFTERNOON AND EVENING. RAINFALL COVERAGE IS EXPECTED TO BE A LITTLE HIGHER THAN ON TUESDAY...WITH THE GREATEST CHANCES OVER THE COASTAL COUNTIES DURING THE AFTERNOON. A CLUSTER OF LIGHTNING STORMS BETWEEN LAKE OKEECHOBEE AND THE MELBOURNE ORLANDO AREA WILL CONTINUE TO DRIFT TO THE EAST. A WELL DEVELOPED SEA BREEZE FROM THE FLORIDA WEST COAST WILL MOVE EAST INTO CENTRAL FLORIDA. ADDITIONAL LIGHTNING STORM DEVELOPMENT IS EXPECTED OVER MUCH OF CENTRAL FLORIDA AS THIS SEA BREEZE COLLIDES WITH THE OUTFLOW BOUNDARY MOVING NORTH FROM THE SOUTHERN STORMS. THE GREATEST THREAT FOR LIGHTNING STORMS AND POSSIBLY LARGE HAIL AND DAMAGING WINDS WILL EXTEND FROM THE GREATER ORLANDO AREA TO THE COAST AND AS FAR NORTH AS DAYTONA BEACH. MOST LIGHTNING FATALITIES AND INJURIES OCCUR IN OPEN FIELDS OR UNDER TREES. IF OUTDOORS...SEEK SHELTER IN A STURDY BUILDING OR CAR. DO NOT TAKE SHELTER IN SMALL SHEDS...UNDER ISOLATED TREES...OR IN CONVERTIBLE AUTOMOBILES. MARINE OUTLOOK...SCATTERED STORMS WILL PRODUCE CLOUD TO GROUND LIGHTNING NEAR OR EAST OF THE INTRACOASTAL WATERWAYS AS THE INLAND LIGHTNING STORMS MOVE EAST THIS AFTERNOON. THESE STORMS WILL LAST INTO THE EARLY EVENING. DECKER
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 1:48 PM EDT | Severe Thunderstorm Warning | MLB | Orange | 42 min |
| Apr 28, 4:39 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 61 min |
| Apr 28, 4:45 PM EDT | Severe Thunderstorm Warning | MLB | Lake | 60 min |
| Apr 28, 7:02 PM EDT | Tornado Warning | MLB | Osceola | 33 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.