Alert archive / South Carolina / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 182, NWS Greenville-Spartanburg, SC

September 21, 2000Oconee County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Sep 21, 2000, 2:38 AM EDT for Oconee County, South Carolina. It was in force for 37 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
Sep 21, 2000, 2:38 AM EDT (06:38 UTC)
Expired
Sep 21, 2000, 3:15 AM EDT
In force
37 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Whole counties

County Oconee County, SC

What was reported inside it

TimeReportWhereRemark
Sep 21, 3:00 AM EDTThunderstorm Wind 50 ESeneca, SC

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, 6.6 hours before the alert went out and 203 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 2000-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1480 joules per kilogram.LCLEL10008507005003002001001 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 2000-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 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
1480 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1314 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.3

Open this sounding in Storm Lab

The text

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

000 
WUUS52 KGSP 210639
SVRGSP
SCC073-210715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
238 AM EDT THU SEP 21 2000

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OCONEE COUNTY IN UPSTATE SOUTH CAROLINA

* UNTIL 315 AM EDT

* AT 237 AM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
  SEVERE THUNDERSTORMS FROM 17 MILES NORTH OF WALHALLA TO 5 MILES
  EAST OF TOCCOA...MOVING EAST AT 25 MPH.

* THE LINE OF SEVERE THUNDERSTORMS WILL BE NEAR...
  WESTMINSTER AT 245 AM EDT
  SALEM AT 250 AM EDT
  OAKWAY AT 255 AM EDT
  SENECA AT 300 AM EDT

SEVERE THUNDERSTORM WINDS CAN REACH SPEEDS OF 60 TO 100 MPH. THESE
WINDS BLOW DOWN TREES...POWER LINES...AND SEVERELY DAMAGE MOBILE 
HOMES AND SOMETIMES BUILDINGS.

$$

MOORE

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 20, 9:07 PM EDT, 5 hours 31 minutes earlier.

Area forecast discussion, Sep 20, 9:07 PM EDT, 5 hours 31 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
907 PM EDT WED SEP 20 2000

REGIONAL 88D MOSAIC INDICATED A COUPLE OF AREAS OF CONCERN FOR
THE UPDATE PACKAGE THIS EVENING. TSTMS IN NE GA DEVELOPED IN
MODERATELY UNSTABLE AIRMASS (00Z FFC SNDG HAD LI -5/CAPE 2800 J/KG)
BEING ENHANCED BY S/WV...DEPICTED BY RUC TO DRIFT NE THRU THE
EVENING. INSTABILITY DECREASES GRADUALLY AS ONE HEADS NE ACRS THE
CWFA WITH 00Z GSO SNDG LI 0/CAPE 300 J/KG. STORMS ARE TRYING TO
MAINTAIN THEMSELVES INTO THE CWFA & MAY ADD A SMALL POP TO
ACCOUNT FOR THIS.

ACRS EAST TENNESSEE...BROKEN LINE OF TSTMS FIRING IN THETA-E RIDGE
...AS DEPICTED BY ETA...DOES ONLY GRADUALLY WEAKEN THIS FEATURE
AS IT SHIFTS INTO THE NC MTNS OVERNIGHT.. IN ADDITION...LINE OF
STORMS ALONG OUTFLOW BNDRY IN KY FCST TO INCREASE WITH S/WV ENERGY
ACRS  WW746 & MOMENTUM MAY BRING TAIL END OF REMNANTS INTO NC MTNS
EARLY THU AM AS WELL.

.\GSP...
GA...NONE.
NC...NONE.
SC...NONE.

CSH

In the hours before

Special weather statement, Sep 20, 11:43 PM EDT, 2 hours 55 minutes before
GAZ010-017-018-026-028-NCZ033-048>054-058-059-062>067-SCZ001>007-010-
211000-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1143 PM EDT WED SEP 20 2000

STRONG TO SEVERE THUNDERSTORMS HAVE DEVELOPED TONIGHT IN PARTS OF
EAST TENNESSEE...NORTH GEORGIA...AND NORTH ALABAMA.  NATIONAL
WEATHER SERVICE OFFICES TO OUR WEST HAVE ISSUED A FEW SEVERE
THUNDERSTORM WARNINGS FOR THESE STORMS...AND THERE HAVE BEEN A FEW
REPORTS OF LARGE HAIL AND DAMAGING WIND.

THESE STORMS WERE STEADILY MOVING TOWARD EXTREME NORTHEAST
GEORGIA...AND THE WESTERN CAROLINAS.  IT IS LIKELY THAT A NUMBER OF
THESE STORMS WILL STILL BE STRONG...CAPABLE OF WIND GUSTS BETWEEN 40
AND 55 MPH AND WITH SOME HAIL.  IT IS POSSIBLE A FEW STORMS COULD
STILL BE SEVERE...CAUSING DAMAGING WINDS OF 60 MPH OR HIGHER...AND
LARGE HAIL.

THE STORMS WILL MOVE FROM WEST TO EAST ACROSS THE AREA BETWEEN
MIDNIGHT AND DAYBREAK.  LISTEN FOR LATER STATEMENTS OR WARNINGS.

JONES

Nearby

Severe Thunderstorm Warnings in South Carolina, 2000Every severe thunderstorm warning in 2000

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.