Alert archive / Florida / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 21, NWS Tampa Bay, FL

April 21, 1994Citrus County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 21, 1994, 3:21 PM EDT for Citrus County, Florida. It was in force for 39 min.

The area

The counties it named.

The facts

Issued
Apr 21, 1994, 3:21 PM EDT (19:21 UTC)
Expired
Apr 21, 1994, 4:00 PM EDT
In force
39 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Citrus County, FL

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 7.4 hours before the alert went out and 128 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

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KTBW 211923
SVRTBW
FLC017-212000-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL
321 PM EDT THU APR 21 1994
 
THE NATIONAL WEATHER SERVICE IN TAMPA BAY AREA RUSKIN HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  400 PM EDT
FOR PEOPLE......
 
IN WEST CENTRAL FLORIDA
 
   ...NORTHEASTERN CITRUS COUNTY
 
A SEVERE THUNDERSTORM WAS DETECTED BY RADAR NEAR HOLDER IN EXTREME
NORTHEAST CITRUS COUNTY.THE THUNDERSTORM WAS MOVING TO THE NORTH
AT 10 TO 15 MPH.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
IF YOU ARE IN THE PATH OF A SEVERE THUNDERSTORM MOVE TO A
REINFORCED BUILDING.
 
IF YOU SEE A TORNADO... WATERSPOUT... HAIL OR DAMAGING WIND...
CALL YOUR LOCAL SHERIFF OFFICE AND ASK THEM TO RELAY YOUR REPORT
TO THE NATIONAL WEATHER SERVICE.

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, 2:21 PM EDTSevere Thunderstorm WarningTBWPinellas54 min
Apr 21, 2:26 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando49 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.