Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 84, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Jun 4, 1999, 3:01 PM EDT for Seminole County, Volusia County, Florida. It was in force for 44 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
- Jun 4, 1999, 3:01 PM EDT (19:01 UTC)
- Expired
- Jun 4, 1999, 3:45 PM EDT
- In force
- 44 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
Counties Seminole County, FL, Volusia County, FL
The radar
The Melbourne radar (KMLB), 101 km from the middle of the area, began a volume at 19:01 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 |
|---|---|---|---|
| Jun 4, 3:15 PM EDT | Thunderstorm Wind 50 | Osteen, FL | Thunderstorm winds blew down power lines and trees along Route 415 south of Osteen. |
| Jun 4, 3:18 PM EDT | Hail 0.75 | Sanford, 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
Jacksonville, FL (KJAX), launched 12:00Z, 7.0 hours before the alert went out and 186 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
- 640 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 1110 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 110 m²/s²
- 0-3 km storm-relative helicity
- 104 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 041902
SVRMLB
FLC117-127-041945-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
301 PM EDT FRI JUN 4 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SEMINOLE COUNTY IN EAST CENTRAL FLORIDA
SOUTHWESTERN VOLUSIA COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 345 PM EDT
* AT 303 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 5 MILES EAST OF DELTONA IN SOUTHWEST VOLUSIA
COUNTY. MOVEMENT WAS SOUTH AT 15 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
OSTEEN IN VOLUSIA COUNTY BY 310 PM
OVIEDO IN SEMINOLE COUNTY BY 335 PM
OTHER THUNDERSTORMS WERE DEVELOPING NEAR GENEVA AND MAY BECOME
SEVERE.
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 Jun 4, 10:25 AM EDT, 4 hours 36 minutes earlier.
Area forecast discussion, Jun 4, 10:25 AM EDT, 4 hours 36 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 1025 AM EDT FRI JUN 4 1999 CURRENTLY...13Z SURFACE ANALYSIS SHOWS SURFACE RIDGE ACROSS CENTRAL FLORIDA WITH WESTERLY WINDS 5 TO 10 MPH. LATEST VIS SATELLITE IMAGERY SHOWS CU DEVELOPING ACROSS SOUTHERN AREAS... INDICATIVE OF HIGHEST MOISTURE. 10Z CAP SOUNDING SHOWS AVAILABLE MOISTURE IS SOMEWHAT LESS THAN PREVIOUS DAYS. IN ADDITION...12Z RUC INDICATES NVA AT H5. FORECAST...EXPECT EAST COAST SEA BREEZE TO FORM ALONG THE COAST BY NOON AND MOVE INLAND DURING THE AFTERNOON HOURS...BUT MAY BE A LITTLE DELAYED FROM YESTERDAY AS WESTERLY WINDS A LITTLE MORE PERSISTENT THIS MORNING. EXPECT CONVECTION TO INITIATE AS SEA BREEZE INTERACTS WITH LAKE BREEZES AND PARTICULARLY WITH THE WEST COAST BREEZE LATER THIS EVENING. OVERALL...COVERAGE OF STORMS SHOULD BE LESS THAN YESTERDAY. NORTHERLY STEERING FLOW WILL GUIDE ANY STORMS SOUTHWARD AT 10 TO 15 MPH...SO DO NOT EXPECT SUCH FLOODING RAINS AS WE SAW YESTERDAY. WILL UPDATE NORTHERN AND CENTRAL COASTAL COUNTIES TO ADD COASTAL/ INLAND RANGE OF TEMPS. OTHERWISE FORECAST LOOKS GOOD. MARINE...NO CHANGES OTHER THAN TO TWEAK WINDS TO THE W FLG-COF LEG. .MLB...NONE. KELLY/CRISTALDI
In the hours before
Special weather statement, Jun 4, 11:35 AM EDT, 3 hours 26 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-042200- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1135 AM EDT FRI JUN 4 1999 ...WIDELY SCATTERED LIGHTNING STORMS EXPECTED THIS AFTERNOON... LIGHT WINDS WILL ALLOW THE ATLANTIC SEA BREEZE TO FORM AROUND NOON SOUTH OF CAPE CANAVERAL...AND BY 2 PM NORTH OF CAPE CANAVERAL. AS THE SEA BREEZE BOUNDARY MOVES INLAND...IT WILL COMBINE WITH SUFFICIENT MOISTURE TO ACT AS A FOCUS FOR SCATTERED SHOWER AND LIGHTNING STORM FORMATION. THROUGH MID AFTERNOON...A FEW STORMS WILL BEGIN TO FORM OVER THE COASTAL COUNTIES...ESPECIALLY INLAND SAINT LUCIE AND MARTIN COUNTIES...WHERE LAKE AND SEA BREEZES WILL INTERACT. STORM DEVELOPMENT WILL SHIFT INLAND AND INCREASE IN COVERAGE LATE THIS AFTERNOON AND EVENING OVER THE CENTRAL FLORIDA INTERIOR. STORM MOVEMENT IS EXPECTED TO BE SOUTH AT 10 TO 15 MPH. ISOLATED STORMS COULD BECOME STRONG AND PRODUCE SMALL HAIL AND WIND GUSTS TO AROUND 40 MPH. DEADLY CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY RAIN WILL ALSO ACCOMPANY THE STORMS. DONT TAKE CHANCES WHEN LIGHTNING STORMS ARE NEARBY...MOVE QUICKLY TO A SAFE LOCATION INDOORS. AS STORMS BEGIN TO FORM ALONG THE SEA BREEZE EARLY THIS AFTERNOON... CLOUD TO WATER LIGHTNING MAY AFFECT A FEW AREAS ALONG THE INTRACOASTAL WATERWAYS AND NEARSHORE ATLANTIC WATERS. THE MOST FAVORED COASTAL AREAS FOR LIGHTNING TODAY WILL BE NEAR MERRITT ISLAND AND SOUTH OF FORT PIERCE INLET. KELLY
Special weather statement, Jun 4, 11:35 AM EDT, 3 hours 26 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-042200- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1135 AM EDT FRI JUN 4 1999 ...WIDELY SCATTERED LIGHTNING STORMS EXPECTED THIS AFTERNOON... LIGHT WINDS WILL ALLOW THE ATLANTIC SEA BREEZE TO FORM AROUND NOON SOUTH OF CAPE CANAVERAL...AND BY 2 PM NORTH OF CAPE CANAVERAL. AS THE SEA BREEZE BOUNDARY MOVES INLAND...IT WILL COMBINE WITH SUFFICIENT MOISTURE TO ACT AS A FOCUS FOR SCATTERED SHOWER AND LIGHTNING STORM FORMATION. THROUGH MID AFTERNOON...A FEW STORMS WILL BEGIN TO FORM OVER THE COASTAL COUNTIES...ESPECIALLY INLAND SAINT LUCIE AND MARTIN COUNTIES...WHERE LAKE AND SEA BREEZES WILL INTERACT. STORM DEVELOPMENT WILL SHIFT INLAND AND INCREASE IN COVERAGE LATE THIS AFTERNOON AND EVENING OVER THE CENTRAL FLORIDA INTERIOR. STORM MOVEMENT IS EXPECTED TO BE SOUTH AT 10 TO 15 MPH. ISOLATED STORMS COULD BECOME STRONG AND PRODUCE SMALL HAIL AND WIND GUSTS TO AROUND 40 MPH. DEADLY CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY RAIN WILL ALSO ACCOMPANY THE STORMS. DONT TAKE CHANCES WHEN LIGHTNING STORMS ARE NEARBY...MOVE QUICKLY TO A SAFE LOCATION INDOORS. AS STORMS BEGIN TO FORM ALONG THE SEA BREEZE EARLY THIS AFTERNOON... CLOUD TO WATER LIGHTNING MAY AFFECT A FEW AREAS ALONG THE INTRACOASTAL WATERWAYS AND NEARSHORE ATLANTIC WATERS. THE MOST FAVORED COASTAL AREAS FOR LIGHTNING TODAY WILL BE NEAR MERRITT ISLAND AND SOUTH OF FORT PIERCE INLET. KELLY
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 8:10 PM EDT | Severe Thunderstorm Warning | MLB | Lake | 45 min |
| Jun 3, 8:54 PM EDT | Severe Thunderstorm Warning | MLB | Lake | 36 min |
| Jun 4, 3:36 PM EDT | Severe Thunderstorm Warning | MLB | Orange | 44 min |
| Jun 4, 4:26 PM EDT | Severe Thunderstorm Warning | MLB | Osceola | 44 min |
| Jun 4, 4:47 PM EDT | Severe Thunderstorm Warning | MLB | Lake | 48 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.