Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 48, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at May 9, 1999, 2:30 PM EDT for Martin County, Florida. It was in force for 45 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
- May 9, 1999, 2:30 PM EDT (18:30 UTC)
- Expired
- May 9, 1999, 3:15 PM EDT
- In force
- 45 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
County Martin County, FL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 9, 2:52 PM EDT | Hail 0.75 | Palm City, FL | |
| May 9, 2:55 PM EDT | Hail 0.75 | Indiantown, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 9, 2:00 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Miami, FL (KMFL), launched 12:00Z, 6.5 hours before the alert went out and 141 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
- 1797 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 812 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- -18 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 091830 RRA
SVRMLB
FLC085-091915-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
230 PM EDT SUN MAY 9 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MARTIN COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 315 PM EDT
* AT 225 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF SEVERE THUNDERSTORMS FROM THE PALM BEACH/MARTIN
COUNTY LINE WEST OF JUPITER TO NEAR INDIANTOWN. ANOTHER STRONG
STORM WAS DEVELOPING NEAR PALM CITY. MOVEMENT OF THE STORMS WAS
NEARLY STATIONARY.
* THE STORMS WILL AFFECT CENTRAL AND EASTERN MARTIN COUNTY WITH
LARGE HAIL...GUSTY WINDS AND FREQUENT LIGHTNING.
THESE ARE DANGEROUS STORMS. 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 May 9, 10:22 AM EDT, 4 hours 8 minutes earlier.
Area forecast discussion, May 9, 10:22 AM EDT, 4 hours 8 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 1022 AM EDT SUN MAY 9 1999 MORN SOUNDINGS STILL SUFFICIENTLY MOIST AND UNSTABLE THROUGH C AND S PART OF STATE WHILE DRIER AND MORE STABLE AIR OVER NRN FL. AREA OF HIGH CLOUDS SPREADING OVER REGION BUT SHOULD BE ON THE WANE THROUGH THE AFTN AS VORT PASSES ACROSS SRN PART OF STATE. WHILE STORM COVERAGE MAY NOT BE TOO HIGH...THE STORMS THAT DO DEVELOP COULD GET STRONG WITH HIGHER COVERAGE EXPECTED IN SRN SECTIONS THAN IN N. WILL UPDATE ZONES TO FRESHEN WORDING AND MAKE MINOR TWEAKS. MARINE...WEAK SURFACE PRESSURE GRADIENT WILL KEEP WINDS LESS THAN 15 KT WITH ONSHORE WINDS NEAR THE COAST DURING THE AFTERNOON. OFFSHORE BUOYS REPORTING 1 FT WIND WAVES...2 FT SWELLS WITH A PERIOD OF 12 SECONDS OR MORE. NO SIGNIFICANT CHANGES TO CURRENT COASTAL WATERS FORECAST. .MLB...NONE. GLITTO/WIMMER
In the hours before
Special weather statement, May 9, 11:24 AM EDT, 3 hours 6 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-092000- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1124 AM EDT SUN MAY 9 1999 ...SCATTERED AFTERNOON AND EVENING LIGHTNING STORMS WITH A FEW STRONG TO SEVERE STORMS POSSIBLE... AFTERNOON HEATING COMBINED WITH AN UNSTABLE AIR MASS AND SEA BREEZE BOUNDARIES WILL ALLOW SCATTERED LIGHTNING STORMS TO FORM AGAIN OVER EAST CENTRAL FLORIDA. A FEW STORMS MAY BEGIN TO DEVELOP DURING THE EARLY AFTERNOON...BUT THE HIGHEST COVERAGE OF STORMS IS EXPECTED TO BE SOUTH OF CAPE CANAVERAL AND ORLANDO DURING THE LATE AFTERNOON AND EARLY EVENING HOURS. THE MAIN THREATS WITH STRONGER STORMS WILL BE FREQUENT LIGHTNING... LARGE HAIL AND DAMAGING WIND GUSTS. DUE TO THE SLOW MOVEMENT OF SOME STORMS...LOCALLY HEAVY RAIN WILL BE POSSIBLE...WHICH CAN CAUSE PONDING OF WATER ON ROADS AND IN LOW LYING AREAS. IF YOU PLAN TO BE OUTDOORS...BE PREPARED TO MOVE INDOORS AT THE FIRST SIGN OF AN APPROACHING STORM. MARINE INTERESTS SHOULD SEEK HARBOR BEFORE A STORM IS OVERHEAD. SKYWARN SPOTTER NETWORKS ARE REQUESTED TO SELF ACTIVATE IF A WARNING IS ISSUED FOR THEIR COUNTY. GLITTO
Special weather statement, May 9, 1:45 PM EDT, 45 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-100000- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 145 PM EDT SUN MAY 9 1999 ...SEVERE THUNDERSTORM WATCH UNTIL 800 PM FOR OSCEOLA... OKEECHOBEE...BREVARD...INDIAN RIVER...ST LUCIE AND MARTIN COUNTIES... AFTERNOON HEATING COMBINED WITH A VERY UNSTABLE AIR MASS AND SEA BREEZE BOUNDARIES WILL CONTINUE THUNDERSTORM DEVELOPMENT THROUGH THE AFTERNOON AND INTO THE EVENING HOURS. AS STORMS CONTINUE TO INTENSIFY THIS AFTERNOON... SEVERE STORMS WILL BE POSSIBLE... ESPECIALLY OVER AREAS SOUTH OF ORLANDO AND CAPE CANAVERAL. THE MAIN THREATS FROM SEVERE STORMS WILL BE LARGE HAIL AND DAMAGING WIND GUSTS. ADDITIONALLY...FREQUENT TO EXCESSIVE LIGHTNING AND VERY HEAVY RAIN WILL BE POSSIBLE. RAINFALL AMOUNTS OF AROUND TWO INCHES MAY OCCUR IN A SHORT PERIOD OF TIME...WHICH CAN CAUSE PONDING OF WATER ON ROADS AND IN LOW LYING AREAS. PERSONS SHOULD BE PREPARED TO GO TO A PLACE OF SAFETY IMMEDIATELY IF A STORM APPROACHES. SKYWARN SPOTTER NETWORKS ARE REQUESTED TO SELF ACTIVATE IF A WARNING IS ISSUED FOR THEIR COUNTY. GLITTO
Special weather statement, May 9, 1:45 PM EDT, 45 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-100000- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 145 PM EDT SUN MAY 9 1999 ...SEVERE THUNDERSTORM WATCH UNTIL 800 PM FOR OSCEOLA... OKEECHOBEE...BREVARD...INDIAN RIVER...ST LUCIE AND MARTIN COUNTIES... AFTERNOON HEATING COMBINED WITH A VERY UNSTABLE AIR MASS AND SEA BREEZE BOUNDARIES WILL CONTINUE THUNDERSTORM DEVELOPMENT THROUGH THE AFTERNOON AND INTO THE EVENING HOURS. AS STORMS CONTINUE TO INTENSIFY THIS AFTERNOON... SEVERE STORMS WILL BE POSSIBLE... ESPECIALLY OVER AREAS SOUTH OF ORLANDO AND CAPE CANAVERAL. THE MAIN THREATS FROM SEVERE STORMS WILL BE LARGE HAIL AND DAMAGING WIND GUSTS. ADDITIONALLY...FREQUENT TO EXCESSIVE LIGHTNING AND VERY HEAVY RAIN WILL BE POSSIBLE. RAINFALL AMOUNTS OF AROUND TWO INCHES MAY OCCUR IN A SHORT PERIOD OF TIME...WHICH CAN CAUSE PONDING OF WATER ON ROADS AND IN LOW LYING AREAS. PERSONS SHOULD BE PREPARED TO GO TO A PLACE OF SAFETY IMMEDIATELY IF A STORM APPROACHES. SKYWARN SPOTTER NETWORKS ARE REQUESTED TO SELF ACTIVATE IF A WARNING IS ISSUED FOR THEIR COUNTY. GLITTO
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 8:26 PM EDT | Severe Thunderstorm Warning | MLB | Saint Lucie | 49 min |
| May 9, 2:59 PM EDT | Severe Thunderstorm Warning | MLB | Saint Lucie | 61 min |
| May 9, 3:20 PM EDT | Severe Thunderstorm Warning | MLB | Brevard | 60 min |
| May 9, 3:32 PM EDT | Severe Thunderstorm Warning | MLB | Indian River | 63 min |
| May 9, 3:52 PM EDT | Severe Thunderstorm Warning | MLB | Okeechobee | 58 min |
| May 9, 4:27 PM EDT | Severe Thunderstorm Warning | MLB | Brevard | 48 min |
| May 9, 4:36 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 64 min |
| May 9, 5:21 PM EDT | Severe Thunderstorm Warning | MLB | Brevard | 29 min |
| May 9, 5:23 PM EDT | Severe Thunderstorm Warning | MLB | Seminole | 47 min |
| May 9, 6:16 PM EDT | Severe Thunderstorm Warning | MLB | Orange | 59 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.