Alert archive / Florida / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 19, NWS Tampa Bay, FL

April 21, 1994Pinellas County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 21, 1994, 2:21 PM EDT for Pinellas County, Florida. It was in force for 54 min.

The area

The counties it named.

The facts

Issued
Apr 21, 1994, 2:21 PM EDT (18:21 UTC)
Expired
Apr 21, 1994, 3:15 PM EDT
In force
54 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Pinellas County, FL

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 6.4 hours before the alert went out and 40 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 1994-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1135 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 1994-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 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
1135 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
781 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

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
Apr 20, 9:00 PM EDTSevere Thunderstorm WarningTBWHernando45 min
Apr 21, 2:26 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando49 min
Apr 21, 3:21 PM EDTSevere Thunderstorm WarningTBWCitrus39 min
Apr 21, 3:45 PM EDTSevere Thunderstorm WarningTBWSumter30 min
Apr 21, 4:39 PM EDTSevere Thunderstorm WarningTBWHernando, Sumter51 min
Apr 21, 6:37 PM EDTSevere Thunderstorm WarningTBWPolk38 min

Nearby

Severe Thunderstorm Warnings in Florida, 1994Every severe thunderstorm warning in 1994

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.