Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 78, NWS Tampa Bay, FL

May 19, 1999Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at May 19, 1999, 5:15 PM EDT for Polk County, Florida. It was in force for 45 min. 3 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 19, 1999, 5:15 PM EDT (21:15 UTC)
Expired
May 19, 1999, 6:00 PM EDT
In force
45 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Polk County, FL

What was reported inside it

TimeReportWhereRemark
May 19, 5:19 PM EDTHail 0.88Bartow, FLNickel sized hail was reported by FAA control tower personnel at the Bartow Municipal Airport.
May 19, 5:20 PM EDTThunderstorm WindLakeland, FLA Skywarn Spotter reported that thunderstorm winds downed three to four large trees near the intersection of Medulla and County LIne Roads.
May 19, 5:28 PM EDTHail 0.88Winter Haven, FLNickel sized hail was reported by the public through the broadcast media near the intersection of U.S. Highway 92 and Thornhill Road.

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

Cape Canaveral, FL (KXMR), launched 12:00Z, 9.3 hours before the alert went out and 131 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, Cape Canaveral, FL at 12:00Z on 1999-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 372 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, Cape Canaveral, FL at 12:00Z on 1999-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
372 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
1258 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 19, 1:45 PM EDTSevere Thunderstorm WarningTBWSarasota45 min
May 19, 4:27 PM EDTSevere Thunderstorm WarningTBWPolk48 min
May 19, 5:21 PM EDTSevere Thunderstorm WarningTBWHillsborough49 min
May 19, 6:10 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.