Alert archive / Georgia / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 49, NWS Atlanta, GA

February 16, 1990Rockdale County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Feb 16, 1990, 8:55 AM EST for Rockdale County, Georgia. It was in force for 35 min.

The area

The counties it named.

The facts

Issued
Feb 16, 1990, 8:55 AM EST (13:55 UTC)
Expired
Feb 16, 1990, 9:30 AM EST
In force
35 min
Issued by
NWS Atlanta, GA
Area
Whole counties

County Rockdale 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, 1.9 hours before the alert went out and 75 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 1990-02-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 41 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, Athens Municipal, GA at 12:00Z on 1990-02-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 269 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
41 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
698 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
269 m²/s²
0-3 km storm-relative helicity
289 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KATL 161356
SVRATL
GAC247-161430-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ATLANTA GA
855 AM EST FRI FEB 16 1990
 
THE NATIONAL WEATHER SERVICE IN ATLANTA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  930 AM EST
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTHWEST GEORGIA
          ...ROCKDALE
 
AT 850 AM RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTH OF
CONYERS MOVING NORTHEAST AT 45 MPHM.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 16, 12:16 AM ESTFlash Flood WarningFFCChattooga, Floyd3 hr
Feb 16, 12:52 AM ESTFlash Flood WarningFFCBartow, Gilmer, Gordon, Pickens3 hr
Feb 16, 12:52 AM ESTFlash Flood WarningFFCFannin, Murray3 hr
Feb 16, 1:22 AM ESTSevere Thunderstorm WarningFFCFloyd, Polk53 min
Feb 16, 1:23 AM ESTFlash Flood WarningFFCDade, Walker3 hr
Feb 16, 1:23 AM ESTFlash Flood WarningFFCCatoosa, Whitfield3 hr
Feb 16, 3:08 AM ESTFlash Flood WarningFFCChattooga, Floyd3 hr
Feb 16, 3:51 AM ESTFlash Flood WarningFFCPolk4 hr
Feb 16, 3:51 AM ESTFlash Flood WarningFFCFannin4 hr
Feb 16, 3:51 AM ESTFlash Flood WarningFFCBartow, Gilmer, Gordon, Murray, Pickens4 hr
Feb 16, 4:39 AM ESTFlash Flood WarningFFCCatoosa, Walker, Whitfield3 hr
Feb 16, 4:39 AM ESTFlash Flood WarningFFCDade3 hr
Feb 16, 5:58 AM ESTSevere Thunderstorm WarningFFCCobb, Douglas, Fulton47 min
Feb 16, 6:29 AM ESTFlash Flood WarningFFCFannin, Gilmer, Murray6 hr
Feb 16, 6:29 AM ESTFlash Flood WarningFFCBartow, Floyd, Gordon, Pickens, Polk6 hr
Feb 16, 6:29 AM ESTFlash Flood WarningFFCChattooga6 hr
Feb 16, 6:58 AM ESTSevere Thunderstorm WarningFFCHall62 min
Feb 16, 7:03 AM ESTSevere Thunderstorm WarningFFCGwinnett27 min
Feb 16, 7:20 AM ESTSevere Thunderstorm WarningFFCNewton, Walton55 min
Feb 16, 7:20 AM ESTSevere Thunderstorm WarningFFCBanks, Barrow, Jackson55 min
Feb 16, 7:20 AM ESTSevere Thunderstorm WarningFFCHabersham55 min
Feb 16, 9:39 AM ESTSevere Thunderstorm WarningFFCHeard, Troup66 min
Feb 16, 10:04 AM ESTSevere Thunderstorm WarningFFCCoweta41 min
Feb 16, 10:43 AM ESTFlash Flood WarningFFCCobb, DeKalb, Fulton4 hr
Feb 16, 12:38 PM ESTSevere Thunderstorm WarningFFCHouston37 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; the sounding from the Mesonet's radiosonde archive.