Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 48, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at May 9, 1999, 2:45 PM EDT for Highlands County, Florida. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 9, 1999, 2:45 PM EDT (18:45 UTC)
- Expired
- May 9, 1999, 3:30 PM EDT
- In force
- 45 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Highlands County, FL
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
Tampa Bay, FL (KTBW), launched 12:00Z, 6.8 hours before the alert went out and 112 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
- 929 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 1185 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 16 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 Tampa Bay, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 9, 2:00 PM EDT, 45 minutes earlier.
Area forecast discussion, May 9, 2:00 PM EDT, 45 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY-RUSKIN FL 200 PM EDT SUN MAY 9 1999 CURRENTLY: WATCH HAS US HOPPING SO DISCUSSION WILL BE BRIEF. CONVECTION FORMING ON WEST COAST SEABREEZE WITH MOTION BASED AS MUCH ON PROPOGATION AS IT IS ON ADVECTION WITH LIGHT WINDS HOLDING BACK STEERING. STORMS SHOULD GRADUALLY MOVE INLAND THROUGH THE AFTERNOON AND EARLY EVENING. HAIL WILL AGAIN BE THE BIGGEST THREAT. FORECAST: 3 MODELS GIVE 3 DIFFERENT SOLUTIONS ON EVOLUTION OF UPPER LOW OVER THE SOUTHEAST DURING THE NEXT 2 DAYS. I HAVE SEEN IN THE PAST THAT THE AVN MODEL TENDS TO DO BEST WITH THESE TYPES OF CUTOFFS ...SO WOULD LEAN TOWARD THAT SOLUTION. THIS PUTS THE CUTOFF THE FARTHEST WEST AND RIGHT OVER THE STATE. THE POSITION WILL KEEP SCATTERED DIURNAL CONVECTION GOING THROUGH THE FORECAST PERIOD AS COLD TEMPS ALOFT CONTRIBUTE TO CONTINUING INSTABILITY. TPA 67/88/67/88 1313 FMY 69/90/69/90 1313 LAL 66/90/66/90 2424 ALSHEIMER
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 1:05 PM EDT | Severe Thunderstorm Warning | TBW | DeSoto | 40 min |
| May 9, 1:24 PM EDT | Severe Thunderstorm Warning | TBW | Manatee | 36 min |
| May 9, 2:15 PM EDT | Severe Thunderstorm Warning | TBW | Manatee | 45 min |
| May 9, 2:25 PM EDT | Severe Thunderstorm Warning | TBW | Lee | 50 min |
| May 9, 3:15 PM EDT | Severe Thunderstorm Warning | TBW | Lee | 45 min |
| May 9, 4:00 PM EDT | Severe Thunderstorm Warning | TBW | Lee | 30 min |
| May 9, 4:08 PM EDT | Severe Thunderstorm Warning | TBW | Polk | 37 min |
| May 9, 6:15 PM EDT | Severe Thunderstorm Warning | TBW | Polk | 30 min |
| May 9, 7:08 PM EDT | Severe Thunderstorm Warning | TBW | Polk | 47 min |
| May 9, 7:42 PM EDT | Severe Thunderstorm Warning | TBW | DeSoto | 48 min |
| May 9, 7:55 PM EDT | Severe Thunderstorm Warning | TBW | Polk | 35 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; the sounding from the Mesonet's radiosonde archive.