Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 15, NWS Atlanta, GA

January 18, 1999Jefferson County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jan 18, 1999, 5:56 AM EST for Jefferson County, Georgia. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jan 18, 1999, 5:56 AM EST (10:56 UTC)
Expired: Jan 18, 1999, 6:30 AM EST
In force: 34 min
Issued by: NWS Atlanta, GA
Area: Whole counties

County Jefferson County, GA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jan 18, 5:15 AM EST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 10.9 hours before the alert went out and 197 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: 378 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 617 m²/s²
0-3 km storm-relative helicity: 700 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.9

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KATL 181058 RRA
SVRATL
GAC163-181130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
556 AM EST MON JAN 18 1999

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN EAST CENTRAL GEORGIA

* UNTIL 630 AM EST

* AT 555 AM EST... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  8 MILES SOUTHWEST OF WADLEY... MOVING EAST AT 50 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE...
   WADLEY                      AROUND 600 AM EST

DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND DEADLY LIGHTNING
ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. IF YOU SEE DAMAGE OR
LARGE HAIL...CALL THE NATIONAL WEATHER SERVICE AT 770.486.1133
EXTENSION 204.

$$ KDF/BDL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 17, 7:31 PM EST	Severe Thunderstorm Warning	FFC	Monroe	44 min
Jan 17, 8:16 PM EST	Severe Thunderstorm Warning	FFC	Laurens	49 min
Jan 17, 8:57 PM EST	Severe Thunderstorm Warning	FFC	Treutlen	33 min
Jan 17, 9:17 PM EST	Severe Thunderstorm Warning	FFC	Emanuel	48 min
Jan 18, 4:24 AM EST	Severe Thunderstorm Warning	FFC	Crisp	36 min
Jan 18, 4:43 AM EST	Severe Thunderstorm Warning	FFC	Floyd, Polk	47 min
Jan 18, 4:45 AM EST	Severe Thunderstorm Warning	FFC	Dodge, Pulaski	35 min
Jan 18, 5:04 AM EST	Severe Thunderstorm Warning	FFC	Laurens	51 min
Jan 18, 5:19 AM EST	Severe Thunderstorm Warning	FFC	Bartow, Cherokee, Gordon, Pickens	31 min
Jan 18, 5:24 AM EST	Severe Thunderstorm Warning	FFC	Wilcox	31 min
Jan 18, 5:36 AM EST	Severe Thunderstorm Warning	FFC	Johnson	34 min
Jan 18, 5:39 AM EST	Severe Thunderstorm Warning	FFC	Crisp, Wilcox	36 min
Jan 18, 6:00 AM EST	Severe Thunderstorm Warning	FFC	Pulaski	35 min
Jan 18, 7:30 AM EST	Severe Thunderstorm Warning	FFC	Jefferson	35 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; the sounding from the Mesonet's radiosonde archive.