Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 70, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at May 19, 1999, 5:42 PM EDT for Volusia County, Florida. It was in force for 48 min. 1 report 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 19, 1999, 5:42 PM EDT (21:42 UTC)
- Expired
- May 19, 1999, 6:30 PM EDT
- In force
- 48 min
- Issued by
- NWS Melbourne, FL
- Area
- Whole counties
County Volusia County, FL
The radar
The Melbourne radar (KMLB), 116 km from the middle of the area, began a volume at 21:42 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 |
|---|---|---|---|
| May 19, 6:12 PM EDT | Thunderstorm Wind 50 | New Smyrna Beach, FL | Power lines were blown down west of New Smyrna Beach. |
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
Cape Canaveral, FL (KXMR), launched 12:00Z, 9.7 hours before the alert went out and 91 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
- 372 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 1258 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 20 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 192142 RRA
SVRMLB
FLC127-192230-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
542 PM EDT WED MAY 19 1999
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
VOLUSIA COUNTY IN EAST CENTRAL FLORIDA
* UNTIL 630 PM EDT
* AT 542 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 8 MILES SOUTHWEST OF DAYTONA BEACH AND ALONG
INTERSTATE 4. MOVEMENT WAS SOUTHEAST AT 15 MPH.
* THE SEVERE THUNDERSTORM WILL CROSS...
HIGHWAY 44 IN THE NEXT 10 MINUTES THEN MOVE JUST EAST OF LAKE
HELEN.
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 May 19, 2:18 PM EDT, 3 hours 24 minutes earlier.
Area forecast discussion, May 19, 2:18 PM EDT, 3 hours 24 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 218 PM EDT WED MAY 19 1999 TONIGHT...UPPER LEVEL SHORT WAVE/VORT MAX AND CONVERGENCE ZONE AHEAD OF FRONT WILL MOVE SLOWLY SOUTHEAST AND KEEP THUNDERSTORMS GOING THROUGH EARLY EVENING OVER FA. THE THUNDERSTORMS WILL GENERALLY DEVELOP IN PROX TO SEA BREEZE COLLISION AND SHRT WV AXIS IN THE N AND SHIFT SE TO COASTAL RGNS THIS EVE. THE HIGHEST POPS TONIGHT WILL BE OVER THE S PTN OF FA DUE TO AFTERNOON INTERIOR STORMS MOVING SOUTHEAST TOWARDS THE EAST COAST. THE COLD FRONT WILL BECOME DIFFUSE OVERNIGHT AS RIDGE OF HIGH BUILD IN FROM THE NORTH. PATCHY FOG SHOULD DEVELOP OVER FA EARLY THURSDAY MORNING DUE TO LIGHT WINDS AND DECENT LOW LEVEL MOISTURE. LONG TERM...SFC BNDRY WILL WASH OUT ACROSS NORTHERN PARTS OF FA AS MID LVL SHRT WV/VRT AXIS MOVES SOUTH OF THE PENINSULA BY THU MORNING. WATER VAPOR IMG SHOWS SIGNIFICANT DRYING IN THE MID LEVELS BEHIND FEATURE BUT THE LOW LEVELS WL HAVE MINIMAL DRYING. MDL GUIDANCE SHOWS PW VALUES FM A HIGH NEAR 1.4 THIS EVE TO JUST ABV 1.0 THU MORNING. MORE IMPORTANTLY HOWEVER...THERE SHUD BE SIGNIFICANT SYNOPTIC DVM AS THE MDLS DIFFERENTIAL VORT ADV SHOWS BEHIND MID LEVEL WV. AS SFC RIDGE TENDS TO BRIDGE WHAT IS LEFT OF LOW LEVEL BNDRY AN INVERTED TROF IS DEPICTED ESP IN ETA S OF THE HIGH. THIS IN PART MAY BE THE REASON FOR HIER THAN EXPECTED POPS FOR TMRW. WILL BIAS POPS HIGHEST IN THE S AS THEY SHUD HOLD ON TO THE MOISTURE THE LONGEST. SFC RIDGE BUILDING ACROSS THE CAROLINAS WILL KEEP DEEP EASTERLY FLOW ACROSS THE STATE INTO THE WEEKEND. GUIDANCE SHOWS LRG SCALE SUBSIDENCE S OF RIDGE AXIS AND DRY AIR. REGARDLESS ESTRLIES WL PUSH E COAST BREEZE RAPIDLY THRU FA DURING THE LT MORNING AND EARLY AFTN LIMITING PCPN CHCS THRU THE WEEKEND. NOCTURNAL SHRA CHC WILL BE LIMITED INITIALY FOR ABV MENTIONED SUBSIDENCE. MARINE...SHRA/TS ACTVTY WL MOVE OFF THE COAST THIS EVE AND INTO THE OPEN WATERS. VRBL FLOW TO BECOME NE AND INC LATE THU AS RIDGE SHIFTS S. PRELIM... DAB BU 064/083 065/083 068 0532- MCO BU 065/086 066/087 067 0532- MLB BB 067/084 068/084 069 05331 .MLB...NONE. BORZILLERI/BLOTTMAN
In the hours before
Special weather statement, May 19, 11:45 AM EDT, 5 hours 57 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-192200- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1145 AM EDT WED MAY 19 1999 ...SCATTERED AFTERNOON AND EVENING THUNDERSTORMS...SOME STRONG... ...GREATER THAN NORMAL THREAT FOR RIP CURRENTS... THE ATMOSPHERE WILL BECOME MODERATELY UNSTABLE THIS AFTERNOON AHEAD OF AN APPROACHING COOL FRONT. WEAK SURFACE WINDS WILL ALLOW THE EAST COAST SEA BREEZE TO DEVELOP EARLY IN THE AFTERNOON AND PUSH QUICKLY INLAND. THE STRONGEST THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE MID AFTERNOON NORTH OF A LINE FROM CAPE CANAVERAL TO ORLANDO AND CLERMONT. OTHER ISOLATED THUNDERSTORMS MAY DEVELOP ALONG THE SEA BREEZE BOUNDARY SOUTH OF THE ORLANDO METRO AREA AND NEAR THE LARGER LAKES. STORMS WILL MOVE EAST TO SOUTHEAST AT 10 TO 15 MPH AND AFFECT SOME COASTAL COMMUNITIES LATE THIS AFTERNOON AND THIS EVENING. SMALL HAIL...GUSTY WINDS...FREQUENT CLOUD TO GROUND LIGHTNING AND HEAVY RAIN ARE POSSIBLE IN THE STRONGER STORMS. MOVE INDOORS AT THE FIRST SIGN OF THREATENING SKIES. A PERSISTENT LONG PERIOD SWELL WILL RESULT IN A GREATER THAN NORMAL THREAT FOR RIP CURRENTS ALONG THE BEACHES OF VOLUSIA...BREVARD... INDIAN RIVER...ST LUCIE AND MARTIN COUNTIES. THE THREAT WILL BE GREATEST DURING THE OUTGOING TIDE THIS AFTERNOON...SO SWIM NEAR A LIFEGUARD. NEVER ATTEMPT TO SWIM DIRECTLY AGAINST A CURRENT...BUT MOVE AT AN ANGLE TO IT...THEN BACK TO SHORE. BORZILLERI
Special weather statement, May 19, 11:45 AM EDT, 5 hours 57 minutes before
AMZ550-555-570-575-FLZ041-044>047-053-054-058-059-064-192200- EAST CENTRAL FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MELBOURNE FL 1145 AM EDT WED MAY 19 1999 ...SCATTERED AFTERNOON AND EVENING THUNDERSTORMS...SOME STRONG... ...GREATER THAN NORMAL THREAT FOR RIP CURRENTS... THE ATMOSPHERE WILL BECOME MODERATELY UNSTABLE THIS AFTERNOON AHEAD OF AN APPROACHING COOL FRONT. WEAK SURFACE WINDS WILL ALLOW THE EAST COAST SEA BREEZE TO DEVELOP EARLY IN THE AFTERNOON AND PUSH QUICKLY INLAND. THE STRONGEST THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE MID AFTERNOON NORTH OF A LINE FROM CAPE CANAVERAL TO ORLANDO AND CLERMONT. OTHER ISOLATED THUNDERSTORMS MAY DEVELOP ALONG THE SEA BREEZE BOUNDARY SOUTH OF THE ORLANDO METRO AREA AND NEAR THE LARGER LAKES. STORMS WILL MOVE EAST TO SOUTHEAST AT 10 TO 15 MPH AND AFFECT SOME COASTAL COMMUNITIES LATE THIS AFTERNOON AND THIS EVENING. SMALL HAIL...GUSTY WINDS...FREQUENT CLOUD TO GROUND LIGHTNING AND HEAVY RAIN ARE POSSIBLE IN THE STRONGER STORMS. MOVE INDOORS AT THE FIRST SIGN OF THREATENING SKIES. A PERSISTENT LONG PERIOD SWELL WILL RESULT IN A GREATER THAN NORMAL THREAT FOR RIP CURRENTS ALONG THE BEACHES OF VOLUSIA...BREVARD... INDIAN RIVER...ST LUCIE AND MARTIN COUNTIES. THE THREAT WILL BE GREATEST DURING THE OUTGOING TIDE THIS AFTERNOON...SO SWIM NEAR A LIFEGUARD. NEVER ATTEMPT TO SWIM DIRECTLY AGAINST A CURRENT...BUT MOVE AT AN ANGLE TO IT...THEN BACK TO SHORE. BORZILLERI
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 5:53 PM EDT | Severe Thunderstorm Warning | MLB | Seminole | 47 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.