Alert archive / Florida / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 197, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Aug 19, 1998, 3:55 PM EDT for Hillsborough County, Florida. It was in force for 35 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
- Aug 19, 1998, 3:55 PM EDT (19:55 UTC)
- Expired
- Aug 19, 1998, 4:30 PM EDT
- In force
- 35 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, 7.9 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
- 463 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1061 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- -42 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 Aug 19, 2:35 PM EDT, 1 hour 20 minutes earlier.
Area forecast discussion, Aug 19, 2:35 PM EDT, 1 hour 20 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY AREA / RUSKIN FL 230 PM EDT TUE AUG 18 1998 CURRENTLY...DIURNAL CONVECTION OVER THE FORECAST AREA...MOST COVERAGE OVER THE INTERIOR. EXPECTING THE ACTIVITY TO CONTINUE MOVING WEST THROUGH THE FA...ENDING THIS EVENING. MODELS NOT INDICATING ANY SIGNIFICANT CHANGE TO THE OVERALL MOISTURE OR STABILITY OF THE ATMOSPHERE FOR TOMORROW....EXCEPT NGM INDICATING SOME DRYING AT MID LEVELS OVER SOUTH FLORIDA. HIGH PRESSURE TO CONTINUE BUILDING SOUTH INTO THE MIDATLANTIC STATES THOUGH TOMORROW...FORCING A BACK DOOR FRONT DOWN THROUGH THE CAROLINAS AND INTO GEORGIA. WITH GENERAL LOW PRESSURE REMAINING TO THE SOUTH...THIS WILL RESULT IN A TIGHTER PRESSURE GRADIENT OVER THE STATE TOMORROW. THIS INCREASE IN THE EASTERLY FLOW SHOULD RESULT IN CONVECTIVE ACTIVITY MAKING IT WEST INTO THE FA EARLIER THAN NORMAL...AND THEN PERHAPS ENDING EARLIER THAN NORMAL IN THE EVENING. ALSO...KEEPING AN EYE ON INTERESTING TROPICAL FEATURES.
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 10:07 PM EDT | Severe Thunderstorm Warning | TBW | Pinellas | 48 min |
| Aug 19, 4:14 PM EDT | Severe Thunderstorm Warning | TBW | Lee | 31 min |
| Aug 19, 4:42 PM EDT | Tornado Warning | TBW | Pinellas | 33 min |
Nearby
Severe Thunderstorm Warnings in Florida, 1998Every severe thunderstorm warning in 1998
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.