Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 21, NWS Greenville-Spartanburg, SC

May 6, 1999Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 6, 1999, 1:18 AM EDT for Rabun County, Georgia. It was in force for 32 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
May 6, 1999, 1:18 AM EDT (05:18 UTC)
Expired
May 6, 1999, 1:50 AM EDT
In force
32 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Whole counties

County Rabun County, GA

The radar

The Greer radar (KGSP), 108 km from the middle of the area, began a volume at 05:18 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

TimeReportWhereRemark
May 6, 1:41 AM EDTHail 1Clayton, GA

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 00:00Z, 5.3 hours before the alert went out and 196 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, Peachtre/Fal Fld, GA at 00:00Z on 1999-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 645 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, Peachtre/Fal Fld, GA at 00:00Z on 1999-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 square meters per square second.193958Sfc1 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
645 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
1.0
Supercell composite
9.1

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KGSP 060519 RRA
SVRGSP
GAC241-060550-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
118 AM EDT THU MAY 6 1999

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  RABUN COUNTY IN NORTHEASTERN GEORGIA

* UNTIL 150 AM EDT

* AT 117 AM EDT... NATIONAL WEATHER SERVICE RADAR INDICATED A
  SEVERE THUNDERSTORM 11 MILES WEST OF CLAYTON OR IN THE VICINITY
  OF MOCCASIN CREEK STATE PARK... MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TIGER AT 135 AM EDT
  BLACK ROCK MOUNTAIN STATE PARK AT 140 AM EDT
  CLAYTON AT 140 AM EDT
  MOUNTAIN CITY AT 140 AM EDT
  DILLARD AT 145 AM EDT

PEOPLE IN THE PATH OF THIS STORM SHOULD BE ALERT FOR LARGE HAIL
AND DAMAGING WINDS.  FREQUENT LIGHTNING AND LOCALLY HEAVY RAIN CAN
OCCUR WITH ANY THUNDERSTORM.

Nearby

Severe Thunderstorm Warnings in Georgia, 1999Every 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.