Alert archive / Florida / Tornado Warnings in 1989

Tornado Warning 9, NWS Tampa Bay, FL

September 12, 1989Hillsborough County, Florida

NWS Tampa Bay, FL issued this tornado warning at Sep 12, 1989, 6:50 PM EDT for Hillsborough County, Florida. It was in force for 25 min.

The area

The counties it named.

The facts

Issued
Sep 12, 1989, 6:50 PM EDT (22:50 UTC)
Expired
Sep 12, 1989, 7:15 PM EDT
In force
25 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Hillsborough County, FL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 10.8 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 1989-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 816 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 1989-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
816 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
956 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
8 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

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

000 
TTAA00 KTBW 122252
TORTBW
FLC057-122315-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL
650 PM EDT TUE SEP 12 1989
 
THE NATIONAL WEATHER SERVICE IN TAMPA BAY AREA RUSKIN HAS ISSUED A
TORNADO WARNING AND
SPECIAL MARINE WARNING EFFECTIVE UNTIL  715 PM EDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN CENTRAL FLORIDA
          ...HILLSBOROUGH
 
AND WATERS OF TAMPA BAY.
 
 
A TORNADO WAS SIGHTED IN THE PALMA CEIA AREA AND A WATERSSPOUT WAS
SIGHTED OVER TAMPA BAY ABOUT 2 MILES WEST OF THE ALAFIA RIVER.
MOVEMENT WAS SLOWLY WEST.
 
IF YOU ARE IN THE PATH OF A TORNADO MOVE TO A REINFORCED SHELTER
TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR. AVOID WINDOWS.
ABANDON CARS AND MOBILE HOMES FOR A REINFORCED BUILDING OR GET
INTO A DITCH OR CULVERT.
 
MARINE INTERESTS IN THESE WATERS SHOULD AVOID THESE STORMS AND
SEEK SAFE HARBOR.
 
IF YOU SEE A TORNADO... HAIL OR DAMAGING WIND... CALL YOUR LOCAL
SHERIFFS OFFICE OR COUNTY EMERGENCY OPERATIONS CENTER AND REQUEST
THEY RELAY THIS INFORMATION TO THE NATIONAL WEATHER SERVICE.

Nearby

Tornado Warnings in Florida, 1989Every tornado warning in 1989Tornadoes in 1989

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.