Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 18, NWS Tallahassee, FL

February 16, 1990Okaloosa County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Feb 16, 1990, 11:13 AM CST for Okaloosa County, Florida. It was in force for 62 min.

The area

The counties it named.

The facts

Issued
Feb 16, 1990, 11:13 AM CST (17:13 UTC)
Expired
Feb 16, 1990, 12:15 PM CST
In force
62 min
Issued by
NWS Tallahassee, FL
Area
Whole counties

County Okaloosa 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

Apalachicola Mun, FL (KAQQ), launched 12:00Z, 5.2 hours before the alert went out and 185 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, Apalachicola Mun, FL at 12:00Z on 1990-02-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 265 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, Apalachicola Mun, FL at 12:00Z on 1990-02-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 301 square meters per square second.19395878Sfc1 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
265 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
574 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
301 m²/s²
0-3 km storm-relative helicity
295 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPNS 161714 COR
SVRPNS
FLC033-091-113-161815-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING ...CORRECTION...
NATIONAL WEATHER SERVICE PENSACOLA FL
1113 AM CST FRI FEB 16 1990

THE NATIONAL WEATHER SERVICE IN PENSACOLA HAS ISSUED A
SEVERE THUNDERSTORM WARNING AND
SPECIAL MARINE WARNING EFFECTIVE UNTIL 1215 PM CST
FOR PEOPLE IN THE FOLLOWING COUNTIES...

IN NORTHWEST FLORIDA
          ...SOUTHEASTERN ESCAMBIA...SOUTHERN OKALOOSA
          ...SOUTHERN SANTA ROSA

AND ADJOINING COASTAL WATERS OF THESE THREE COUNTIES.

AT 1105 AM CST RADAR INDICATED A CLUSTER OF SEVERE THUNDERSTORMS OVER
EXTREME SOUTHERN ESCAMBIA COUNTY FLORIDA AND THE COASTAL WATERS UP TO
25 MILES SOUTH OF THERE.

THE CLUSTER OF STORMS WAS MOVING TO THE NORTHEAST AT 45 MPH TOWARD THE
SOUTHERN AND COASTAL SECTIONS OF SANTA ROSA AND OKALOOSA COUNTIES.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN ANQD OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

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 16, 9:51 AM CST, 1 hour 22 minutes before
TTAAFL KTLH 161551
FLZ003-GAZ011-162100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1055 AM EST FRI FEB 16 1990

...TORNADO WATCH NUMBER 46 IS IN EFFECT UNTIL 4 PM EST THIS AFTERNOON.
THE WATCH AREA IS 80 STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES
EAST OF PENSACOLA FLORIDA TO 45 MILES EAST OF COLUMBUS GEORGIA.  THE
WATCH INCLUDES THE FLORIDA COUNTY OF JACKSON AND THE GEORGIA COUNTIES OF
SEMINOLE AND DECATUR.  CURRENTLY NATIONAL WEATHER SERVICE RADAR INDICATES
ONLY LIGHT RAIN OCCURING OVER PARTS OF JACKSON COUNTY AND OVER SOUTHEAST
ALABAMA.  HOWEVER HEAVIER THUNDERSTORMS ARE CURRENTLY LOCATED IN PARTS OF
SOUTHERN ALABAMA AND THE WESTERN FLORIDA PANHANDLE.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES
AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.  PERSONS IN THESE
AREAS SHOULD BE ON THE OUTLOOK FOR THREATENING WEATHER CONDITIONS ARE BE
PREPARED TO MOVE TO A PLACE OF SAFETY IMMEDIATELY.G

CTC

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 16, 9:33 AM CSTSevere Thunderstorm WarningTAEEscambia, Santa Rosa42 min
Feb 16, 10:11 AM CSTSevere Thunderstorm WarningTAEEscambia, Santa Rosa64 min
Feb 16, 11:13 AM CSTSevere Thunderstorm WarningTAEEscambia, Santa Rosa62 min
Feb 16, 2:28 PM CSTSevere Thunderstorm WarningTAECalhoun32 min

Nearby

Severe Thunderstorm Warnings in Florida, 1990Every severe thunderstorm warning in 1990

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.