Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 8, NWS Atlanta, GA

January 18, 1999Floyd County, Polk County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jan 18, 1999, 4:43 AM EST for Floyd County, Polk County, Georgia. It was in force for 47 min. 1 report 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: Jan 18, 1999, 4:43 AM EST (09:43 UTC)
Expired: Jan 18, 1999, 5:30 AM EST
In force: 47 min
Issued by: NWS Atlanta, GA
Area: Whole counties

Counties Floyd County, GA, Polk County, GA

The radar

The Atlanta radar (KFFC), 104 km from the middle of the area, began a volume at 09:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jan 18, 5:06 AM EST	Hail 0.75	Rome, GA	A spotter reported dime size hail.

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 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, 2:15 AM EST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 9.7 hours before the alert went out and 107 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 180945 RRA
SVRATL
GAC115-233-181030-

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

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FLOYD COUNTY IN NORTHWESTERN GEORGIA
  POLK COUNTY IN NORTHWESTERN GEORGIA

* UNTIL 530 AM EST

* AT 442 AM EST... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  10 MILES SOUTHWEST OF COOSA... MOVING EAST AT 60 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE...
   COOSA                       AROUND 450 AM EST
   CAVE SPRING                 AROUND 450 AM EST
   LINDALE                     AROUND 455 AM EST
   SENEY                       AROUND 455 AM EST
   ROME                        AROUND 500 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, 4:45 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, 5:56 AM EST	Severe Thunderstorm Warning	FFC	Jefferson	34 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.