Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 678, NWS Atlanta, GA

August 25, 1999Morgan County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 25, 1999, 5:57 PM EDT for Morgan County, Georgia. It was in force for 33 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 25, 1999, 5:57 PM EDT (21:57 UTC)
Expired: Aug 25, 1999, 6:30 PM EDT
In force: 33 min
Issued by: NWS Atlanta, GA
Area: Whole counties

County Morgan County, GA

What was reported inside it

Time	Report	Where	Remark
Aug 25, 6:25 PM EDT	Hail 1.75	Madison, GA	A spotter reported golf ball size hail.
Aug 25, 6:40 PM EDT	Hail 1.75	Madison, GA	A spotter reported golf ball size hail from 6:25 pm to 6:40 pm EDT.

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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.0 hours before the alert went out and 97 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: -81 J/kg
Mixed-layer LCL: 754 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KATL 252200 RRA
SVRATL
GAC211-252230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
557 PM EDT WED AUG 25 1999

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 5:06 PM EDT	Severe Thunderstorm Warning	FFC	Troup	34 min
Aug 25, 5:42 PM EDT	Severe Thunderstorm Warning	FFC	Newton	33 min
Aug 25, 6:04 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, Douglas	36 min
Aug 25, 6:11 PM EDT	Severe Thunderstorm Warning	FFC	Newton	19 min
Aug 25, 6:30 PM EDT	Severe Thunderstorm Warning	FFC	Greene, Morgan	35 min
Aug 25, 7:37 PM EDT	Severe Thunderstorm Warning	FFC	DeKalb	33 min

Nearby

Severe Thunderstorm Warnings in Georgia, 1999 Every severe thunderstorm warning in 1999

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.