Alert archive / Georgia / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 166, NWS Atlanta, GA

May 20, 1990Screven County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 20, 1990, 6:06 PM EDT for Screven County, Georgia. It was in force for 54 min.

The area

The counties it named.

The facts

Issued: May 20, 1990, 6:06 PM EDT (22:06 UTC)
Expired: May 20, 1990, 7:00 PM EDT
In force: 54 min
Issued by: NWS Atlanta, GA
Area: Whole counties

County Screven 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

Charleston AFB, SC (KCHS), launched 12:00Z, 10.1 hours before the alert went out and 152 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 541 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KAGS 202207
SVRAGS
GAC251-202300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUGUSTA GA
606 PM EDT SUN MAY 20 1990
 
THE NATIONAL WEATHER SERVICE IN AUGUSTA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  700 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST CENTRAL GEORGIA
 
   ...EASTERN SCREVEN COUNTY
 
AT 600 PM EDT NATIONAL WEATHER SERVICE RADAR WAS DETECTING A SEVERE
THUNDERSTORM JUST EAST OF SYLVANIA GEORGIA MOVING SLOWLY EASTWARD
AROUND 5 MPH.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
 
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.

Issued	Product	Office	Counties	Lasted
May 20, 2:02 PM EDT	Severe Thunderstorm Warning	FFC	Floyd, Polk	43 min
May 20, 2:33 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Haralson, Paulding	42 min
May 20, 2:33 PM EDT	Severe Thunderstorm Warning	FFC	Bartow	42 min
May 20, 2:43 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, Douglas	47 min
May 20, 2:43 PM EDT	Severe Thunderstorm Warning	FFC	Cherokee	47 min
May 20, 3:17 PM EDT	Severe Thunderstorm Warning	FFC	Forsyth, Fulton	43 min
May 20, 3:29 PM EDT	Severe Thunderstorm Warning	FFC	Clayton, DeKalb, Henry	46 min
May 20, 3:29 PM EDT	Severe Thunderstorm Warning	FFC	Fayette	46 min
May 20, 3:50 PM EDT	Severe Thunderstorm Warning	FFC	Gwinnett, Rockdale	55 min
May 20, 3:51 PM EDT	Severe Thunderstorm Warning	FFC	Hall	69 min

Nearby

Severe Thunderstorm Warnings in Georgia, 1990 Every 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.