Alert archive / South Carolina / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 224, NWS Greenville-Spartanburg, SC

August 21, 2005Oconee County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 21, 2005, 6:00 PM EDT for Oconee County, South Carolina. It was in force for 27 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: Aug 21, 2005, 6:00 PM EDT (22:00 UTC)
Expired: Aug 21, 2005, 6:27 PM EDT
In force: 27 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Counties, with a storm outline in the text

County Oconee County, SC

The radar

The Greer radar (KGSP), 79 km from the middle of the area, began a volume at 22:00 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.0 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-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: 2627 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 971 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: -8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Aug 21, 2:41 PM EDT, 3 hours 19 minutes earlier.

Area forecast discussion, Aug 21, 2:41 PM EDT, 3 hours 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
241 PM EDT SUN AUG 21 2005

.SHORT TERM (TONIGHT THROUGH WEDNESDAY)...
UPPER LEVEL TROUGH TO AMPLIFY OVER NE USA TONIGHT...WHILE RIDGE OVER
SE USA WEAKENS. HEAT ADVISORY IN WARM/HUMID AIR MASS REMAINS IN
EFFECT UNTIL 6 PM...WHEN PACKAGE WILL NEED UPDATING. WITH STRONG
LEE TROUGH OVER AREA...DIFFICULT TO KEEP TRACK OF PAIR OF COLD
FRONTS ADVANCING S OVERNIGHT. MODELS SHIFT WIND FROM NNW TO NE
THIS EVENING. SCT CU FIELD MTS AND NC PIEMONT IN SATELLITE
IMAGERY. EXPECT THIS TO DISSIPATE AFTER LOSS OF HEATING. ANY
LEFTOVER CONVECTION SHOULD BE QUITE ISOLATED WITH WARM MID LEVEL
TEMPERATURES OVER AREA. TEMPERATURES AND DEW POINTS REMAIN
ELEVATED OVERNIGHT AS COLD ADVECTION NOT DEPICTED AND ANY LOW
LEVEL DRYING SLOW TO OCCUR. SOME FOG DEVELOPED LAST NIGHT...AND
ALTHOUGH LITTLE RAIN EXPECTED...LIGHT NATURE OF WIND AND NEARLY
CLEAR SKY WILL FAVOR FOG IN LOCATIONS WITH MORE ABUNDANT
MOISTURE...PARTICULARLY NC MT VALLEYS.

UPPER HEIGHTS FALL MONDAY INTO EARLY TUESDAY AS DEEP VORTEX
TRANSLATES SLOWLY ACROSS QUEBEC. THE FRONTAL POSITION REMAINS
HIGHLY UNCERTAIN THROUGH THE SHORT RANGE PERIOD. BOTH THE GFS AND
NAM BRING THE COLD FRONT INTO THE NORTHERN TIER BY LATE MONDAY AND
THEN LARGELY STALL IT OVER THE AREA BY TUESDAY...WITH THE NAM
BEING THE MORE NORTHERN OF THE TWO SOLUTIONS. A WEDGE LIKE
CONFIGURATION OF THE BOUNDARY LOOKS INCREASINGLY LIKELY BY
WEDNESDAY...UPSLOPE NORTH OF THE BOUNDARY PRODUCING COOLING TO
FINALL PUSH THE FRONT SLOWLY SOUTHWARD EAST OF THE MTN CHAIN. THE
SOLUTION WILL GENERALLY BE A MODEL BLEND...BUT LEANING MUCH MORE
HEAVILY ON THE GFS FOR TEMPERATURE AND POP FIELDS.

&&

.LONG TERM (WEDNESDAY NIGHT THROUGH SUNDAY)...
CONSENSUS OF THE MEDIUM RANGE MODELS IS THAT THE GFS IS OVERDONE
WITH STRONG POSITIVELY TILTED TROUGH AFFECTING THE MID ATLANTIC AND
THE WESTERN CAROLINAS ON THURSDAY...AND THE 12Z GFS CONTINUES TO
TREND AWAY FROM THAT SOLUTION. A SLIGHTLY STRONGER UPPER RIDGE
EXTENDING EAST FROM THE LOWER MS RIVER VALLEY WILL BE PREFERRED.
EASTERLY FLOW BEHIND THE SURFACE FRONT DRAPED JUST SOUTHEAST OF
THE AREA COULD LEAD TO SOME ATLANTIC MOISTURE CLOUDINESS...BUT
LESS FORCING ASSOCIATED WITH THE PREFERRED SOLUTION SHOULD KEEP
THE FORECAST MOSTLY DRY. RIDGING AND STRONG MID LEVEL DRYING WILL
THEN PERSIST ACROSS THE REGION FRI THROUGH SUN.

&&

.AVIATION...
WARM MID LEVEL TEMPERATURES TO LIMIT CONVECTION TO ISOLATED COVERAGE
THIS AFTERNOON/EVENING...FAVORED WHERE DIFFERENTIAL HEATING AND
WESTERLY UPSLOPE FLOW AFFECT MTS...BUT TOO ISOLATED TO MENTION AT
KAVL. WINDS FROM N OR NW ON BACK SIDE OF LEE TROUGH. EXPECT
CONVECTIVE CUMULUS TO DISSIPATE....LEAVING ANVIL CIRRUS OVERNIGHT.
MODELS DEPICT PAIR OF WIND SHIFTS MID EVENING AND EARLY MONDAY
MORNING. SECOND WIND SHIFT OCCURS AROUND TIME A COLD FRONT EXPECTED
TO ARRIVE...THOUGH LEE TROUGH MAKES ITS POSITION DIFFICULT TO
DISCERN. MODELS VARY SIGNIFICANTLY ON DEPTH OF MOISTURE ALONG THIS
BOUNDARY. BELIEVE GFS CHARACTERISTICALLY OVERDONE WITH UPPER LEVEL
MOISTURE...AND MAY BE PREMATURE WITH UPGLIDE OVER ITS FARTHER SOUTH
BOUNDARY. EXPECT CONVECTIVE CUMULUS TO DISSIPATE....LEAVING ANVIL
CIRRUS OVERNIGHT. WILL LEAN TOWARD DRIER NAM MON MORNING...KEEPING
LOW DECK SCATTERED IN HEATING AND MARGINAL UPSLOPE COMPONENT.

&&

.GSP WATCHES/WARNINGS/ADVISORIES...
GA...HEAT ADVISORY FOR GAZ018-026-028-029 UNTIL 6 PM SUNDAY.
NC...HEAT ADVISORY FOR NCZ037-057-066>072-082 UNTIL 6 PM SUNDAY.
SC...HEAT ADVISORY FOR SCZ001>014-019 UNTIL 6 PM SUNDAY.
&&

SHORT TERM...HG/JAT
LONG TERM...HG
AVIATION...JAT

Hazardous weather outlook, Aug 21, 5:50 AM EDT, 12 hours 10 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
550 AM EDT SUN AUG 21 2005

GAZ010-017-018-026-028-029-NCZ033>037-048>059-062>072-082-
SCZ001>014-019-221000-
RABUN-HABERSHAM-STEPHENS-FRANKLIN-HART-ELBERT-AVERY-CALDWELL-
ALEXANDER-IREDELL-DAVIE-MADISON-YANCEY-MITCHELL-SWAIN-HAYWOOD-
BUNCOMBE-MCDOWELL-BURKE-CATAWBA-ROWAN-GRAHAM-NORTHERN JACKSON-
MACON-SOUTHERN JACKSON-TRANSYLVANIA-HENDERSON-POLK-RUTHERFORD-
CLEVELAND-LINCOLN-GASTON-MECKLENBURG-CABARRUS-UNION NC-
OCONEE MOUNTAINS-PICKENS MOUNTAINS-GREENVILLE MOUNTAINS-
GREATER OCONEE-GREATER PICKENS-GREATER GREENVILLE-SPARTANBURG-
CHEROKEE-YORK-ANDERSON-ABBEVILLE-LAURENS-UNION SC-CHESTER-
GREENWOOD-
550 AM EDT SUN AUG 21 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF UPSTATE SOUTH
CAROLINA...WESTERN NORTH CAROLINA...PIEDMONT NORTH CAROLINA AND
NORTHEAST GEORGIA.

.DAY ONE...TODAY AND TONIGHT
ISOLATED THUNDERSTORMS WILL BE POSSIBLE JUST ABOUT ANYWHERE ACROSS
THE WESTERN CAROLINAS AND NORTHEAST GEORGIA THIS AFTERNOON.
FREQUENT LIGHTNING AND BRIEF HEAVY RAIN WILL BE THE PRIMARY THREAT
FROM THESE THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
ISOLATED THUNDERSTORMS WILL BE POSSIBLE ON TUESDAY. ONCE AGAIN...
THESE STORMS WILL PRIMARILY PRODUCE FREQUENT LIGHTNING AND LOCALLY
HEAVY RAIN.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED FOR TODAY.

MCAVOY

In the hours before

Local storm report, Aug 21, 5:29 PM EDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
529 PM EDT SUN AUG 21 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0525 PM     HAIL             18 S GREENVILLE         34.58N 82.37W
08/21/2005  0.88 INCH        GREENVILLE         SC   AMATEUR RADIO

            NICKEL-SIZED HAIL REPORTED IN WARE PLACE.

0515 PM     TSTM WND DMG     WALHALLA                34.77N 83.06W
08/21/2005                   OCONEE             SC   EMERGENCY MNGR

            2 TREES DOWN IN WALHALLA.

&&

BURRUS

Local storm report, Aug 21, 5:38 PM EDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
538 PM EDT SUN AUG 21 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0525 PM     TSTM WND DMG     TOCCOA                  34.58N 83.32W
08/21/2005                   STEPHENS           GA   TRAINED SPOTTER

            TREE DOWN ON DOYLE STREET IN TOCCOA. TELEPHONE LINE DOWN
            ALSO.

&&

BURRUS

Local storm report, Aug 21, 5:46 PM EDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
546 PM EDT SUN AUG 21 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0545 PM     HAIL             NORRIS                  34.76N 82.75W
08/21/2005  0.75 INCH        PICKENS            SC   FIRE DEPT/RESCUE

            FIRE CHIEF AT NORRIS FIRE DEPARTMENT REPORTS NICKEL-SIZED
            HAIL.

&&

BURRUS

Local storm report, Aug 21, 5:46 PM EDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
546 PM EDT SUN AUG 21 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0545 PM     HAIL             NORRIS                  34.76N 82.75W
08/21/2005  0.75 INCH        PICKENS            SC   FIRE DEPT/RESCUE

            FIRE CHIEF AT NORRIS FIRE DEPARTMENT REPORTS PENNY-SIZED
            HAIL.

&&

BURRUS

Local storm report, Aug 21, 5:57 PM EDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
557 PM EDT SUN AUG 21 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0553 PM     HAIL             1 W CLEMSON             34.68N 82.83W
08/21/2005  0.75 INCH        PICKENS            SC   AMATEUR RADIO

            DIME-SIZED HAIL FALLING AT HIGHWAY 123 AND OLD CLEMSON
            ROAD.

&&

BURRUS

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 21, 4:52 PM EDT	Severe Thunderstorm Warning	GSP	Anderson	41 min
Aug 21, 4:55 PM EDT	Severe Thunderstorm Warning	GSP	Oconee	65 min
Aug 21, 5:12 PM EDT	Flash Flood Warning	GSP	Anderson, Greenville	4 hr
Aug 21, 5:27 PM EDT	Severe Thunderstorm Warning	GSP	Greenville	25 min
Aug 21, 5:41 PM EDT	Severe Thunderstorm Warning	GSP	Spartanburg	48 min
Aug 21, 5:47 PM EDT	Severe Thunderstorm Warning	GSP	Pickens	39 min
Aug 21, 6:04 PM EDT	Flash Flood Warning	GSP	Oconee, Pickens	3 hr
Aug 21, 5:19 PM EDT	Severe Thunderstorm Warning	GSP	Stephens	47 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2005 Every severe thunderstorm warning in 2005

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; radar from the NEXRAD Level II archive.