Alert archive / Florida / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 21, NWS Tampa Bay, FL

February 22, 1993Hillsborough County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Feb 22, 1993, 2:04 PM EST for Hillsborough County, Florida. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
Feb 22, 1993, 2:04 PM EST (19:04 UTC)
Expired
Feb 22, 1993, 3:00 PM EST
In force
56 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Hillsborough County, FL

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 7.1 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 1993-02-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 926 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 1993-02-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 260 square meters per square second.1939587897117Sfc1 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
926 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
648 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
260 m²/s²
0-3 km storm-relative helicity
263 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTBW 221904
SVRTBW
FLC057-222000-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL
204 PM EST MON FEB 22 1993
 
THE NATIONAL WEATHER SERVICE IN TAMPA BAY AREA RUSKIN HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  300 PM EST
FOR PEOPLE......
 
IN WEST CENTRAL FLORIDA
 
   ...HILLSBOROUGH COUNTY
 
AND ADJACENT COASTAL WATERS
INCLUDING THE BAY AND INLAND WATERS
 
A LINE OF SEVERE THUNDERSTORMS WAS DETECTED BY RADAR OVER NORTHERN
HILLSBOROUGH COUNTY. THE THUNDERSTORM LINE WAS MOVING TO THE SOUTHEAST A
1MPH... BUT INDIVIDUAL THUNDERSTORM CELL WERE MOVING TO THE NORTHEAST AT 
 40 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 THE WEST CENTRAL AND SOUTHWEST FLORIDA SEVERE WEATHER LINE AT
1-800-282-5584.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Feb 22, 9:43 AM EST, 4 hours 21 minutes before
FLZ006-008>021-221535-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL
935 AM EST MON FEB 22 1993

AT 930 AM...WEATHER SERVICE RADAR SHOWED A NARROW LINE OF THUNDERSTORMS
WITH VERY HEAVY RAIN EXTENDED FROM JUST SOUTH OF GAINESVILLE ACROSS
LEVY COUNTY TO THE COAST AND OUT OVER THE GULF FOR 80 MILES.  THIS LINE
WAS EMBEDDED IN A BROAD BAND OF RAIN SHOWERS THAT STRETCHED FROM THE
EAST COAST NEAR JACKSONVILLE ACROSS THE NORTH CENTRAL PORTION OF FLORIDA
TO THE WEST COAST BETWEEN APALACHEE BAY AND CRYSTAL THEN OUT OVER THE
GULF FOR 160 MILES.

MOVEMENT OF THESE RAIN SHOWERS WAS EAST AT 40 MILES AN HOUR.

RESIDENTS OF THIS AREA SHOULD BE ALERT TO THES^E THUNDERSTORMS AS THEY
MAY PRODUCE SOME HIGH WIND GUSTS.  BOATERS AROUND CEDAR KEY SHOULD BE
ALERT FOR FAST MOVING THUNDERSTORMS.
Special weather statement, Feb 22, 10:47 AM EST, 3 hours 17 minutes before
FLZ006-008>021-221635-

SPECIAL WEATHER STATEMENT AND MARINE WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL
1035 AM EST MON FEB 22 1993

AT 1030 AM...WEATHER SERVICE RADAR SHOWED A NARROW LINE OF THUNDERSTORMS
WITH VERY HEAVY RAIN EXTENDED FROM LAKE PALATKA SOUTHWEST TO THE COAST
NEAR WACCASASSA BAY THEN OUT OVER THE GULF FOR 130 MILES.  THIS LINE
WAS EMBEDDED IN A BROAD BAND OF RAIN SHOWERS THAT STRETCHED FROM THE
EAST COAST JACKSONVILLE ACROSS THE NORTH CENTRAL PORTION OF FLORIDA
TO THE WEST COAST BETWEEN HOMOSASSA AND BAYPORT ... THEN OUT OVER THE
GULF WATERS FOR 160 MILES.

MOVEMENT OF THIS LINE WAS SOUTHEAST AT 15 MILES AN HOUR.

RESIDENT OF NORTH CENTRAL FLORIDA SHOULD BE ALERT TO THESE THUNDERSTORMS
AS THEY MAY PRODUCE SOME HIGH WIND GUSTS AND ROUGH SEAS OVER WATER.
BOATERS IN THE AREA BETWEEN CEDAR KEY AND BAYPORT SHOULD BE ALERT FOR
THESE FAST MOVING VERY STRONG THUNDERSTORMS.
Special weather statement, Feb 22, 11:42 AM EST, 2 hours 22 minutes before
FLZ006-008>021-221735-

SPECIAL WEATHER STATEMENT AND MARINE WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL
1135 AM EST MON FEB 22 1993

AT 1130 AM... RADAR SHOWED A LINE OF STRONG THUNDERSTORMS... SOME WITH
VERY HEAVY RAINFALL... ACROSS NORTH CENTRAL FLORIDA AND EAST GULF WATERS
FROM NEAR THE OCALA/SILVER SPRINGS AREA... SOUTHWEST TO CRYSTAL BAY AND
HOMOSASSA... AND CONTINUED TO 110 MILES OFFSHORE OF BAYPORT.

MOVEMENT OF THIS LINE WAS SOUTHEAST AT 15 MILES AN HOUR.

RESIDENT OF NORTH CENTRAL FLORIDA SHOULD BE ALERT TO THESE THUNDERSTORMS
AS THEY MAY PRODUCE GUSTY WINDS... FREQUENT LIGHTNING... AND POSSIBLE
FLOODING OF LOW-LYING AREAS AND ROADWAYS. BOATERS SHOULD KEEP ABREAST OF
THE CHANGING WEATHER CONDITIONS AND BE PREPARED TO SEEK SAFE HARBOR.

THE LINE OF THUNDERSTORMS WAS EMBEDDED IN A LARGE AREA OF RAIN AND
THUNDERSTORMS THAT STRETCHED ACROSS THE STATE FROM NEAR JACKSONVILLE AND
DAYTONA BEACH... TO NEAR CEDAR KEY AND BAYPORT.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 22, 4:24 AM ESTSevere Thunderstorm WarningTBWLevy51 min
Feb 22, 5:30 AM ESTSevere Thunderstorm WarningTBWCitrus60 min
Feb 22, 1:05 PM ESTSevere Thunderstorm WarningTBWPasco55 min
Feb 22, 1:18 PM ESTSevere Thunderstorm WarningTBWPinellas57 min
Feb 22, 2:14 PM ESTSevere Thunderstorm WarningTBWPinellas61 min
Feb 22, 2:59 PM ESTSevere Thunderstorm WarningTBWHillsborough, Manatee61 min
Feb 22, 3:43 PM ESTSevere Thunderstorm WarningTBWPolk62 min
Feb 22, 4:43 PM ESTSevere Thunderstorm WarningTBWSarasota62 min
Feb 22, 5:19 PM ESTSevere Thunderstorm WarningTBWDeSoto41 min
Feb 22, 5:35 PM ESTSevere Thunderstorm WarningTBWHighlands55 min

Nearby

Severe Thunderstorm Warnings in Florida, 1993Every severe thunderstorm warning in 1993

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.