Alert archive / Georgia / Flash Flood Warnings in 1990

Flash Flood Warning 80, NWS Atlanta, GA

December 23, 1990Catoosa County, Walker County, Whitfield County, Georgia

NWS Atlanta, GA issued this flash flood warning at Dec 23, 1990, 9:00 AM EST for Catoosa County, Walker County, Whitfield County, Georgia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Dec 23, 1990, 9:00 AM EST (14:00 UTC)
Expired
Dec 23, 1990, 12:00 PM EST
In force
3 hr
Issued by
NWS Atlanta, GA
Area
Whole counties

Counties Catoosa County, GA, Walker County, GA, Whitfield County, GA

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

Athens Municipal, GA (KAHN), launched 12:00Z, 2.0 hours before the alert went out and 194 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, Athens Municipal, GA at 12:00Z on 1990-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Athens Municipal, GA at 12:00Z on 1990-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 365 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
365 m²/s²
0-3 km storm-relative helicity
381 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 KCHA 231402
FFWCHA
GAC047-295-313-231700-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
900 AM EST SUN DEC 23 1990
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL NOON EST
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN NORTHWEST GEORGIA
 
   ...CATOOSA COUNTY...WALKER COUNTY...WHITFIELD COUNTY
 
AT 900 AM EST RADAR INDICATED MODERATE TO HEAVY RAIN OCCURRING ACROSS
JUST ABOUT ALL OF UPPER NORTHWEST GEORGIA.
 
 
MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A
SMAL,L ONE...ON FOOT.

The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 23, 4:02 AM ESTFlash Flood WarningFFCCatoosa, Walker5 hr
Dec 23, 4:02 AM ESTFlash Flood WarningFFCDade5 hr

Nearby

Flash Flood Warnings in Georgia, 1990Every flash flood 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.