Alert archive / Georgia / Flash Flood Warnings in 1993

Flash Flood Warning 5, NWS Atlanta, GA

March 23, 1993Catoosa County, Georgia; Hamilton County, Tennessee

NWS Atlanta, GA issued this flash flood warning at Mar 23, 1993, 12:12 PM EST for Catoosa County, Georgia; Hamilton County, Tennessee. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Mar 23, 1993, 12:12 PM EST (17:12 UTC)
Expired
Mar 23, 1993, 3:15 PM EST
In force
3 hr
Issued by
NWS Atlanta, GA
Area
Whole counties

Counties Catoosa County, GA, Hamilton County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 5.2 hours before the alert went out and 178 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, Nashville Metro, TN at 12:00Z on 1993-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 100 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, Nashville Metro, TN at 12:00Z on 1993-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 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
100 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
543 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
112 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 231713
FFWCHA
GAC047-TNC065-232015-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TN
1212 PM EST TUE MAR 23 1993
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  315 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTHWEST GEORGIA
 
   ...CATOOSA COUNTY
 
 
IN SOUTHEAST TENNESSEE
 
   ...NORTHERN HAMILTON COUNTY
 
AT 1210 PM EST THE CHATTANOOGA WEATHER RADAR INDICATED THUNDERSTORMS
WITH HEAVY RAIN OVER NORTHERN HAMILTON COUNTY IN SOUTHEAST TENNESSEE AND
IN SOUTHWEST CATOOSA COUNTY IN NORTHWEST GEORGIA.
 
SINCE THE GROUND IS ALREADY SATURATED...RUNOFF FROM THESE THUNDERSTORM
RAINS WILL LIKELY PRODUCE FLASH FLOODING.
 
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT'S
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS.  CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 23, 6:42 PM ESTTornado WarningFFCHart33 min
Mar 23, 10:37 AM ESTFlash Flood WarningFFCMarion3 hr
Mar 23, 10:52 AM ESTFlash Flood WarningFFCRhea2 hr
Mar 23, 4:26 PM ESTSevere Thunderstorm WarningFFCHamilton49 min

Nearby

Flash Flood Warnings in Georgia, 1993Flash Flood Warnings in Tennessee, 1993Every flash flood warning in 1993

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.