Alert archive / Florida / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 90, NWS Tallahassee, FL

September 10, 1990Leon County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Sep 10, 1990, 5:30 PM EDT for Leon County, Florida. It was in force for 45 min.

The area

The counties it named.

The facts

Issued
Sep 10, 1990, 5:30 PM EDT (21:30 UTC)
Expired
Sep 10, 1990, 6:15 PM EDT
In force
45 min
Issued by
NWS Tallahassee, FL
Area
Whole counties

County Leon 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, 9.5 hours before the alert went out and 107 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 1990-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1862 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 1990-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
1862 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
974 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
24 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 102137
SVRTLH
FLC073-102215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
530 PM EDT MON SEP 10 1990
 
THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  615 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH FLORIDA
 
   ...CENTRAL AND EASTERN LEON COUNTY
 
AT 525 PM EDT A SEVERE THUNDERSTORM HAD DEVELOPED OVER SOUTHERN AND
CENTRAL LEON COUNTY...FLORIDA.
 
AT 525 PM EDT 1/2 TO 3/4 INCH HAIL WAS OCCURRING AT THE TALLAHASSEE
REGIONAL AIRPORT.
 
WINDS AT THE TALLAHASSEE AIRPORT WERE GUSTING TO OVER 50 MPH WITH VERY
HEAVY RAIN.
 
THIS WARNING INCLUDES THE GREATER TALLAHASSEE AREA.
 
THIS THUNDERSTORM WAS MOVING TOWARDS THE NORTHEAST AT AROUND 5 MPH.
 
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.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 3:34 PM EDTSevere Thunderstorm WarningTAESanta Rosa56 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.