Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 70, NWS Tallahassee, FL

August 19, 1990Jackson County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Aug 19, 1990, 6:42 PM CDT for Jackson County, Florida. It was in force for 33 min.

The area

The counties it named.

The facts

Issued
Aug 19, 1990, 6:42 PM CDT (23:42 UTC)
Expired
Aug 19, 1990, 7:15 PM CDT
In force
33 min
Issued by
NWS Tallahassee, FL
Area
Whole counties

County Jackson 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, 11.7 hours before the alert went out and 120 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 1990-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 645 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 1990-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
645 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
1136 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
41 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 KTLH 192342
SVRTLH
FLC063-200015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
742 PM EDT (642 PM CDT) SUN AUG 19 1990
 
THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  815 PM EDT (715 PM CDT)
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH FLORIDA
 
   ...SOUTHWESTERN JACKSON COUNTY
 
AT 640 PM CDT NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM OVER SOUTHWEST JACKSON COUNTY NEAR ALFORD. THIS STORM
WILL LIKELY PRODUCE HAIL AND DAMAGING WINDS AS IT MOVES TOWARD THE
SOUTHWEST AT 10 MILES AN HOUR.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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, Aug 19, 3:11 PM CDT, 3 hours 31 minutes before
GAZ011-192115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
408 PM EDT SUN AUG 19 1990

AT 405 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED A STRONG
THUNDERSTORM OVER NORTHWEST THOMAS COUNTY OF SOUTHWEST GEORGIA. THIS
THUNDERSTORM IS CAPABLE OF PRODUCING VERY HEAVY RAINFALL...FREQUENT
CLOUD TO GROUND LIGHTNING...STRONG GUSTY WIND...AND POSSIBLE SMALL
HAIL.

THIS THUNDERSTORM IS MOVING TOWARD THE SOUTHWEST AT 10 MILES AN` HOUR
AND IT MAY MOVE INTO EAST CENTRAL GRADY COUNTY OF SOUTHWEST
GEORGIA DURING THE NEXT 30 MINUTES.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER NEWS MEDIA FOR ADDITIONAL
INFORMATION.

JGM

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.