Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 28, NWS Tampa Bay, FL

May 7, 1999Sumter County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at May 7, 1999, 2:43 PM EDT for Sumter County, Florida. It was in force for 32 min. 1 report 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 7, 1999, 2:43 PM EDT (18:43 UTC)
Expired
May 7, 1999, 3:15 PM EDT
In force
32 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Sumter County, FL

What was reported inside it

TimeReportWhereRemark
May 7, 2:48 PM EDTHail 1Oxford, FLA Skywarn Spotter reported quarter to dime sized hail.

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, 6.7 hours before the alert went out and 116 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.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 1999-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1002 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 1999-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1002 J/kg
Mixed-layer CIN
-145 J/kg
Mixed-layer LCL
1116 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Tampa Bay, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 7, 3:36 PM EDTSevere Thunderstorm WarningTBWPolk39 min
May 7, 3:51 PM EDTSevere Thunderstorm WarningTBWSumter39 min
May 7, 4:20 PM EDTSevere Thunderstorm WarningTBWPolk45 min
May 7, 4:29 PM EDTSevere Thunderstorm WarningTBWHardee46 min
May 7, 5:05 PM EDTSevere Thunderstorm WarningTBWPolk40 min
May 7, 5:25 PM EDTSevere Thunderstorm WarningTBWHighlands35 min
May 7, 5:29 PM EDTSevere Thunderstorm WarningTBWHillsborough31 min
May 7, 6:00 PM EDTSevere Thunderstorm WarningTBWHighlands30 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.