Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 86, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at May 20, 1999, 6:07 PM EDT for Lee County, Florida. It was in force for 28 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
- May 20, 1999, 6:07 PM EDT (22:07 UTC)
- Expired
- May 20, 1999, 6:35 PM EDT
- In force
- 28 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Lee County, FL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 6:09 PM EDT | Hail 1 | Lehigh Acres, FL | Quarter sized hail that covered the ground white was reported by a Skywarn Spotter in Lehigh Acres. |
| May 20, 6:30 PM EDT | Hail 0.75 | Lehigh Acres, FL | Dime sized hail was reported by the public through Cape Coral WZVN-TV. |
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
Miami, FL (KMFL), launched 12:00Z, 10.1 hours before the alert went out and 179 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
- 946 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 1066 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 32 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 20, 3:15 PM EDT, 2 hours 52 minutes earlier.
Area forecast discussion, May 20, 3:15 PM EDT, 2 hours 52 minutes before
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</html>The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 2:58 PM EDT | Severe Thunderstorm Warning | TBW | Levy | 32 min |
| May 20, 3:30 PM EDT | Severe Thunderstorm Warning | TBW | Levy | 30 min |
| May 20, 3:43 PM EDT | Severe Thunderstorm Warning | TBW | Hernando | 32 min |
| May 20, 4:17 PM EDT | Severe Thunderstorm Warning | TBW | Pasco | 33 min |
| May 20, 5:43 PM EDT | Severe Thunderstorm Warning | TBW | DeSoto | 32 min |
| May 20, 6:37 PM EDT | Severe Thunderstorm Warning | TBW | Lee | 33 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.