Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 19, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Apr 29, 1999, 5:27 PM EDT for Lake County, Florida. It was in force for 48 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 29, 1999, 5:27 PM EDT (21:27 UTC)
- Expired
- Apr 29, 1999, 6:15 PM EDT
- In force
- 48 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
County Lake County, FL
The radar
The Melbourne radar (KMLB), 126 km from the middle of the area, began a volume at 21:31 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 29, 5:45 PM EDT | Thunderstorm Wind 60 | Umatilla, FL | Thunderstorm winds blew down trees and power lines, destroyed a barn and damaged the roof of a mobile home in Umatilla. One mobile home was damaged by a falling tree. |
| Apr 29, 5:45 PM EDT | Hail 1.75 | Umatilla, 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, 9.5 hours before the alert went out and 136 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
- 220 J/kg
- Mixed-layer CIN
- -106 J/kg
- Mixed-layer LCL
- 1233 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 75 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 292125 RRA
SVRMLB
FLC069-292215-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
527 PM EDT THU APR 29 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
LAKE COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 615 PM EDT
* AT 525 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM ABOUT OT ENTER LAKE COUNTY NEAR EMERALDA.
MOVEMENT WAS SOUTHEAST AT 20 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
UMATILLA BY 540 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.
CRISTALDIWhat 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 29, 3:45 PM EDT, 1 hour 42 minutes earlier.
Area forecast discussion, Apr 29, 3:45 PM EDT, 1 hour 42 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 134 PM EDT THU APR 29 1999 CURRENTLY...INFLUENCE OF DEVELOPING ATLC LOW INCREASING ACROSS CWA. METARS SHOW INCREASING N COMPONENT TO SFC WINDS...ACTUALLY BECOMING NE ALONG THE N COASTAL AREAS. LOW CLOUDS ALSO DEVELOPING ACROSS NORTH FL BEHIND THE "BACK DOOR" FRONT...WHICH WILL CONTINUE TO SAG SOUTH TOWARDS NORTHERN CWA. TONIGHT...RESIDUAL CONVECTION WILL EXIT OFFSHORE FAIRLY RAPIDLY AS FRONT BEGINS TO PUSHES THROUGH AREA. AS LOW LEVEL MOISTURE INTERACTS WITH SOME WEAK COOL ADVECTION AND INCREASIN 500MB PVA...THERE SHOULD BE DEVELOPMENT OF A LOW SC OR ST DECK OVER THE CWA WITH SOME LIGHT RAIN DEVELOPING...NOT QUITE AS MUCH AS IMPLIED BY THE ETA/NGM. FRI...MODELS FAIRLY SIMILAR AT 500MB...ALTHOUGH I'VE FOLLOWED THE ETA/AVN EARLY ON WITH RESPECT TO INTENSITY OF THE ATLC SURFACE LOW. N-NW WINDS TO INCREASE BY AFTERNOON AS LOW GRADUALLY INTENSIFIES OFFSHORE. WITH 500MB LOW ONLY DROPPING SLOWLY SOUTH...LOW WILL GO ABSOLUTELY NOWHERE FOR A WHILE. TEMPS LOOK TO BE IN THE L-M70S AT BEST AREA-WIDE WITH BKN-OVC LOW CLOUDS AND SOME PERIODS OF LIGHT RAIN SOCKING IN AS SECOND VORT LOBE ROTATES AROUND 500MB. FAIRLY HEFTY MODEL POPS SEEM JUSTIFIED...AND COVERAGE MAY ACTUALLY BE HIGHER THAN WHAT MOS IS SAYING. LONG TERM...OMEGA PATTERN WILL INCH ACROSS THE E HALF OF U.S. THROUGH EXTENDED FCST PD. DUE TO THE STAGNENT FORWARD MOTION...THE DEVELOPING SW ATLC LOW WILL HAVE THE OPPORTUNITY TO BE ENHANCED BY SEVERAL JET CORES FROM THE NRN H25 JET STREAM THROUGH 12Z SUN. AS THE LOW SQUEEZES WITH THE EWD MOVING OMEGA SYSTEM...PRESSURE GRADIENT WILL BECOME QUITE PACKED. H50 VORT LOBES SHOULD BE CLEAR OF FL PEN BY 00Z SUN AS DRY AIR OVER THE MIDWEST IS PULLED SE INTO THE GULF REGION. CLOUDY SKIES SHOULD BREAK UP 00Z-12Z SUN...BUT WINDY CONDITIONS WILL CONTINUE THROUGH SUN AS THE LOW PULLS AWAY. DRY WX TO RETURN FOR THE FIRST PART OF THE WEEK. MARINE...ALL MODELS INDICATING ONSHORE WINDS NEAR GALE FORCE OVER NRN COASTAL WATERS ON SAT. ADD A NORTHEAST SWELL AND A FULL MOON FRI NIGHT...AND THE COASTAL SITUATION LOOKS BLEAK FOR THE WEEKEND. AFTER EXTENSIVE COOR WITH KJAX AND KMIA WILL GO WITH HIGHEST SEAS AND WINDS OVER NRN WATERS...SOMEWHAT LESS OVER SRN WATERS. WILL HOLD OFF CFW FOR NOW...BUT SOMETHING TO KEEP IN MIND SHOULD THE LATEST MODEL RUNS VERIFY. PRELIMINARY NUMBERS... DAB RE 063/072 062/072 061 81386 MCO RE 064/073 061/074 060 81386 MLB RE 064/076 065/075 062 81386= .MLB...NONE CRISTALDI/BRAGAW
In the hours before
Special weather statement, Apr 29, 11:45 AM EDT, 5 hours 42 minutes before
FLZ041-044>047-053-054-058-059-064-292100- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1145 AM EDT THU APR 29 1999 ...A FEW SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING... CONDITIONS REMAIN FAVORABLE FOR THE FORMATION OF SHOWERS AND THUNDERSTORMS ACROSS MUCH OF EAST CENTRAL FLORIDA TODAY. RAINFALL COVERAGE IS NOT EXPECTED TO BE QUITE AS HIGH AS ON WEDNESDAY... HOWEVER MANY AREAS WILL STILL EXPERIENCE MUCH NEEDED RAINFALL. THE GREATEST CHANCE FOR RAIN WILL OCCUR NORTH OF A LINE FROM LAKELAND TO CAPE CANAVERAL...IN ADVANCE OF A COLD FRONT WHICH WILL MOVE INTO NORTH FLORIDA THIS AFTERNOON. INITIAL STORM DEVELOPMENT IS EXPECTED TO OCCUR AROUND MID DAY NEAR THE FLORIDA WEST COAST AND NEAR SOME OF THE LARGER INLAND LAKES. A LATE AFTERNOON SEA BREEZE IS ALSO EXPECTED TO FORM ALONG THE IMMEDIATE EAST COASTAL AREAS. STORMS ALONG THE WEST COAST BREEZE WILL MOVE SOUTHEAST AT 20 MPH ACROSS THE PENINSULA AND SHOULD INTERACT WITH THE EAST COAST SEA BREEZE VERY LATE THIS AFTERNOON DRIER AND COOLER AIR AT MID LEVELS OF THE ATMOSPHERE WILL INCREASE THE LIKELIHOOD FOR A FEW STORMS TO BECOME SEVERE. THE GREATEST THREAT FOR SEVERE WEATHER WILL BE DAMAGING HAIL AND WIND GUSTS. FREQUENT CLOUD TO GROUND LIGHTNING...AND LOCALLY HEAVY RAIN WILL ALSO OCCUR WITH THE STRONGER STORMS. RAINFALL MAY TOTAL AN INCH OR MORE IN A FEW SPOTS. MARINE OUTLOOK...SCATTERED THUNDERSTORMS WILL MOVE SOUTHEAST ACROSS THE INTRACOASTAL WATERWAYS AND INTO THE COASTAL WATERS THIS AFTERNOON AND EVENING. A FEW OF THE STORMS MAY PRODUCE SQUALLS WITH LARGE HAIL...FREQUENT LIGHTNING AND WATERSPOUTS. STORM MOTION WILL BE FASTER TODAY THAN RECENT DAYS. WIND AND SEAS WILL INCREASE FRIDAY AND FRIDAY NIGHT...POSSIBLY TO GALE FORCE...AS LOW PRESSURE FORMS OFFSHORE. SKYWARN ACTIVATION MAY BE REQUIRED TODAY. HAM RADIO OPERATORS ARE ASKED TO SELF ACTIVATE WEATHER NETWORKS IF SEVERE WEATHER BECOMES IMMINENT. CRISTALDI
Special weather statement, Apr 29, 11:45 AM EDT, 5 hours 42 minutes before
FLZ041-044>047-053-054-058-059-064-292100- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1145 AM EDT THU APR 29 1999 ...A FEW SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING... CONDITIONS REMAIN FAVORABLE FOR THE FORMATION OF SHOWERS AND THUNDERSTORMS ACROSS MUCH OF EAST CENTRAL FLORIDA TODAY. RAINFALL COVERAGE IS NOT EXPECTED TO BE QUITE AS HIGH AS ON WEDNESDAY... HOWEVER MANY AREAS WILL STILL EXPERIENCE MUCH NEEDED RAINFALL. THE GREATEST CHANCE FOR RAIN WILL OCCUR NORTH OF A LINE FROM LAKELAND TO CAPE CANAVERAL...IN ADVANCE OF A COLD FRONT WHICH WILL MOVE INTO NORTH FLORIDA THIS AFTERNOON. INITIAL STORM DEVELOPMENT IS EXPECTED TO OCCUR AROUND MID DAY NEAR THE FLORIDA WEST COAST AND NEAR SOME OF THE LARGER INLAND LAKES. A LATE AFTERNOON SEA BREEZE IS ALSO EXPECTED TO FORM ALONG THE IMMEDIATE EAST COASTAL AREAS. STORMS ALONG THE WEST COAST BREEZE WILL MOVE SOUTHEAST AT 20 MPH ACROSS THE PENINSULA AND SHOULD INTERACT WITH THE EAST COAST SEA BREEZE VERY LATE THIS AFTERNOON DRIER AND COOLER AIR AT MID LEVELS OF THE ATMOSPHERE WILL INCREASE THE LIKELIHOOD FOR A FEW STORMS TO BECOME SEVERE. THE GREATEST THREAT FOR SEVERE WEATHER WILL BE DAMAGING HAIL AND WIND GUSTS. FREQUENT CLOUD TO GROUND LIGHTNING...AND LOCALLY HEAVY RAIN WILL ALSO OCCUR WITH THE STRONGER STORMS. RAINFALL MAY TOTAL AN INCH OR MORE IN A FEW SPOTS. MARINE OUTLOOK...SCATTERED THUNDERSTORMS WILL MOVE SOUTHEAST ACROSS THE INTRACOASTAL WATERWAYS AND INTO THE COASTAL WATERS THIS AFTERNOON AND EVENING. A FEW OF THE STORMS MAY PRODUCE SQUALLS WITH LARGE HAIL...FREQUENT LIGHTNING AND WATERSPOUTS. STORM MOTION WILL BE FASTER TODAY THAN RECENT DAYS. WIND AND SEAS WILL INCREASE FRIDAY AND FRIDAY NIGHT...POSSIBLY TO GALE FORCE...AS LOW PRESSURE FORMS OFFSHORE. SKYWARN ACTIVATION MAY BE REQUIRED TODAY. HAM RADIO OPERATORS ARE ASKED TO SELF ACTIVATE WEATHER NETWORKS IF SEVERE WEATHER BECOMES IMMINENT. CRISTALDI
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 6:07 PM EDT | Severe Thunderstorm Warning | MLB | Orange, Seminole | 63 min |
| Apr 29, 6:34 PM EDT | Severe Thunderstorm Warning | MLB | Okeechobee | 61 min |
| Apr 29, 7:31 PM EDT | Severe Thunderstorm Warning | MLB | Indian River | 59 min |
| Apr 29, 7:42 PM EDT | Severe Thunderstorm Warning | MLB | Brevard | 63 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.