Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 88, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Jun 9, 1999, 5:53 PM EDT for Orange County, Florida. It was in force for 62 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 9, 1999, 5:53 PM EDT (21:53 UTC)
- Expired
- Jun 9, 1999, 6:55 PM EDT
- In force
- 62 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 21:54 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 9, 5:55 PM EDT | Hail 1 | Vineland, FL | |
| Jun 9, 5:58 PM EDT | Thunderstorm Wind 50 | Walt Disney World, FL | Thunderstorm winds blew down trees on the Walt Disney World complex. |
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, 9.9 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
- 240 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 861 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 9, 2:13 PM EDT, 3 hours 40 minutes earlier.
Area forecast discussion, Jun 9, 2:13 PM EDT, 3 hours 40 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 213 PM EDT WED JUN 9 1999 TONIGHT...DAYTIME CONVECTION OVER INTERIOR SECTIONS OF PENINSULA WILL BEGIN TO TAPER OFF BY EARLY EVENING. CONVECTION OVER THE COASTAL WATERS WILL CONTINUE INTO THURSDAY MORNING WITH SCATTERED SHOWERS MOVING ONSHORE...ESPECIALLY LATE. UPPER LOW WILL SPIN OVER THE EASTERN GULF OF MEXICO WITH DEEP MOISTURE REMAINING OVER THE AREA. SOUTHEAST FLOW ASSOCIATED WITH A SURFACE RIDGE OVER WESTERN ATLANTIC WILL KEEP OVERNIGHT LOW TEMPS ABOVE NORMAL. THU...NGM/ETA MOVE UPPER TROUGH AXIS NORTH FASTER THAN AVN AND SHIFT HIGHEST PRECIPITABLE WATER NORTH OF THE AREA. SINCE THE FEATURE WILL BE WEAKENING WITH TIME...DO NOT THINK THAT THERE WILL BE THAT MUCH OF AN IMPACT EVEN IF UPPER AXIS AND ASSOCIATED WEAK SUBSIDENCE BEHIND IT MATERIALIZE. OVERALL THE ATMOSPHERE WILL REMAIN MOIST SO EVEN IF THE AXIS SHIFTS NORTH OF US...THE MAIN EFFECT WOULD BE THAT THERE WOULD BE LESS OF THE DEBRIS CLOUDS AROUND THAT HAVE LIMITED COVERAGE OF AFTERNOON CONVECTION RECENTLY. PLANNING ON GOOD CHANCE POPS FOR INTERIOR AND 40 PERCENT ALONG THE COAST. FRI...AVN CONTINUES TO SHOW WEAK CYCLONIC FLOW ALOFT BUT OTHER MODELS WANT TO SHOW WEAK RIDGING AS GULF UPPER LOW FILLS. ETA/NGM SHOW MORE SUBSIDENCE THAN AVN OFF TO OUR EAST IN ASSOCIATION WITH DIGGING TROUGH OFF THE EASTERN SEABOARD BUT DO NOT SEE THIS AFFECTING THE AREA...SO THE RATHER DEEP LAYER OF SOUTH TO SOUTHEAST FLOW SHOULD CONTINUE OUR MOIST REGIME. WILL GO WITH 40 PERCENT POPS INLAND AND 30 ALONG THE COAST. SAT THROUGH MONDAY...DIGGING TROUGH MENTIONED ABOVE FORECAST TO CUT OFF THEN DRIFT SOUTHWEST TOWARDS THE OFFSHORE WATERS. SURFACE RIDGE WILL BUILD ALONG THE EASTERN SEABOARD. NO EVIDENCE OF A SURFACE FRONT MOVING THROUGH THE AREA BUT MRF CONTINUES TO SHOW DEEP LAYER DRIER AIR MOVING ACROSS AS A RESULT OF DEVELOPING SUBSIDENCE ON WEST SIDE OF MID/UPPER LOW. EXPECT AFTERNOON CHANCE POPS INTERIOR AND SLIGHT CHANCE NEAR COAST MAINLY LATE NIGHT/MORNING. MARINE...OUTSIDE OF CONVECTIVELY DISTURBED CONDITIONS...BUOYS HAVE BEEN SHOWING 10 TO 15 KT. RUC SHOWS 15 KT WINDS OVER SOUTHERN AREAS BY 03Z WHILE AVN INCREASES THEM TO 15 TO 20 OVERNIGHT. THIS LOOKS LIKE IT IS IN RESPONSE TO KEEPING LOWER PRESSURES ASSOCIATED WITH WEAK WESTWARD MOVING TROUGH TOO CLOSE TO THE AREA. THEREAFTER... THE SURFACE RIDGE JUST NORTH OF THE MARINE AREA SHOULD NOT CHANGE MUCH IN STRENGTH AS BACKDOOR FRONT DROPS SOUTH ALONG THE EASTERN SEABOARD. HENCE...WILL KEEP THE 10 TO 15 KT SOUTHEAST WINDS THROUGH THE FORECAST PERIOD. PRELIMINARY... DAB BB 073/086 072/086 073 3433 MCO TB 071/088 072/089 072 2524 MLB BB 074/086 073/086 074 3433 .MLB...NONE. BORZILLERI/LASCODY
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 6:37 PM EDT | Severe Thunderstorm Warning | MLB | Osceola | 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.