Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 75, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at May 18, 1999, 6:17 PM EDT for Hillsborough County, Florida. It was in force for 28 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 18, 1999, 6:17 PM EDT (22:17 UTC)
- Expired
- May 18, 1999, 6:45 PM EDT
- In force
- 28 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Hillsborough County, FL
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 10.3 hours before the alert went out and 23 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 997 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 30 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 18, 2:55 PM EDT, 3 hours 22 minutes earlier.
Area forecast discussion, May 18, 2:55 PM EDT, 3 hours 22 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY-RUSKIN FL 255 PM EDT TUE MAY 18 1999 .CURRENTLY...FEW LOWER CLOUDS CONTINUE MOVING ACROSS FA WITH SHOWERS JUST BEYOND OUR EASTERN BORDER ALONG...SUMTER...POLK... AND HIGHLANDS. WHILE ZONES DO NOT CARRY ANY POPS FEEL THREAT OF PCPN IS LOW ENOUGH THAT NOWCASTS CAN TAKE CARE OF REST OF AFTERNOON. .DISCUSSION...H5 LOW OFF SE U.S. TO GET PICKED UP BY SHORT WAVE TROF OVER GREAT LAKES WITH UPPER LEVEL RIDGE BUILDING INTO GULF KEEPING NW UPPER FLOW THROUGH PERIOD. SFC RIDGE ALONG EAST SEABOARD WILL SHIFT AND BECOME EAST-WEST OVER SOUTHERN HALF OF THE STATE AS FRONT MOVES INTO THE PANHANDLE...REACHING NORTH FL WED MORNING AND THEN SLOWLY CREEPING INTO NORTH-CENTRAL FL BY THURSDAY MORNING. WITH SLIGHT INCREASE IN MOISTURE AND IN- STABILITY AHEAD OF FRONT FA CAN SEE MORE SHOWERS WED THAN TODAY...WITH 20 POP FOR NORTH AND CENTRAL COAST AND 30 POP INLAND AND SOUTH. WOULD EXPECT MOST SHOWERS TO BE AFTERNOON ALONG SEA BREEZE. FRONT TO LINGER THURSDAY WITH SCATTERED SHOWERS AGAIN EXPECT IN THE AFTERNOON BUT SLIGHTLY LESS THAN ON WED. GENERALLY ACCEPT FWC/FAN TEMPS. TPA 068/088/066/088 09121 FMY 069/089/069/090 09131
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 6:26 PM EDT | Tornado Warning | TBW | Hillsborough | 34 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.