Alert archive / Georgia / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 293, NWS Atlanta, GA

August 21, 1990Walker County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 21, 1990, 5:13 PM EDT for Walker County, Georgia. It was in force for 47 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 21, 1990, 5:13 PM EDT (21:13 UTC)
Expired
Aug 21, 1990, 6:00 PM EDT
In force
47 min
Issued by
NWS Atlanta, GA
Area
Whole counties

County Walker County, GA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Aug 21, 5:40 PM EDTThunderstorm Wind 0Walker, GA
Aug 21, 5:40 PM EDTThunderstorm Wind 0Walker, GA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.2 hours before the alert went out and 195 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 1990-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1047 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 1990-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
1047 J/kg
Mixed-layer CIN
-102 J/kg
Mixed-layer LCL
1256 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
73 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 212114
SVRCHA
GAC295-212200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHATTANOOGA TENNESSEE
513 PM EDT TUE AUG 21 1990
 
THE NATIONAL WEATHER SERVICE IN CHATTANOOGA TENNESSEE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  600 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS
 
IN NORTHWEST GEORGIA
 
   ...WALKER COUNTY
 
AT 510 PM EDT THE CHATTANOOGA WEATHER RADAR INDICATED A SEVERE
THUNDERSTORM IN THE EXTREME SOUTHWEST PORTION OF WALKER COUNTY
NEAR THE COMMUNITY OF LOOKOUT.
 
THE STORM IS MOVING TO THE NORTHEAST TOWARD LAFAYETTE.
 
 
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 Atlanta, GA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 21, 3:17 PM EDTSevere Thunderstorm WarningFFCCatoosa43 min
Aug 21, 3:26 PM EDTSevere Thunderstorm WarningFFCCarroll42 min
Aug 21, 4:48 PM EDTSevere Thunderstorm WarningFFCChattooga42 min
Aug 21, 5:37 PM EDTSevere Thunderstorm WarningFFCPolk53 min
Aug 21, 5:37 PM EDTSevere Thunderstorm WarningFFCChattooga53 min
Aug 21, 5:55 PM EDTSevere Thunderstorm WarningFFCFloyd50 min
Aug 21, 6:13 PM EDTSevere Thunderstorm WarningFFCJefferson47 min
Aug 21, 6:18 PM EDTSevere Thunderstorm WarningFFCCarroll42 min
Aug 21, 6:33 PM EDTSevere Thunderstorm WarningFFCBartow27 min
Aug 21, 6:43 PM EDTSevere Thunderstorm WarningFFCClayton, Fayette47 min
Aug 21, 6:53 PM EDTSevere Thunderstorm WarningFFCGwinnett52 min
Aug 21, 6:53 PM EDTSevere Thunderstorm WarningFFCHeard52 min
Aug 21, 7:01 PM EDTSevere Thunderstorm WarningFFCCarroll44 min
Aug 21, 7:09 PM EDTSevere Thunderstorm WarningFFCBanks, Habersham, Hall, Jackson66 min
Aug 21, 7:22 PM EDTSevere Thunderstorm WarningFFCTroup53 min

Nearby

Severe Thunderstorm Warnings in Georgia, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.