Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 71, NWS Tampa Bay, FL

May 14, 1999Hillsborough County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at May 14, 1999, 5:41 PM EDT for Hillsborough County, Florida. It was in force for 34 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 14, 1999, 5:41 PM EDT (21:41 UTC)
Expired
May 14, 1999, 6:15 PM EDT
In force
34 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Hillsborough County, FL

What was reported inside it

TimeReportWhereRemark
May 14, 5:50 PM EDTThunderstorm WindTampa, FLTampa cable station Bay News Nine reported that thunderstorm winds toppled a few large trees and caused minor to moderate roof damage to a home in the Town N' Country area.

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, 9.7 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.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 1999-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 846 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 1999-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 square meters per square second.193958Sfc1 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
846 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
979 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.2

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 14, 6:34 PM EDTSevere Thunderstorm WarningTBWHillsborough26 min
May 14, 7:09 PM EDTSevere Thunderstorm WarningTBWHardee, Polk36 min
May 14, 7:35 PM EDTSevere Thunderstorm WarningTBWHillsborough35 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.