Alert archive / South Carolina / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 263, NWS Greenville-Spartanburg, SC

August 20, 2026Polk County, North Carolina; Greenville County, Spartanburg County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 20, 2026, 10:23 PM EDT for Polk County, North Carolina; Greenville County, Spartanburg County, South Carolina. It was in force for 52 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 20, 2026, 10:23 PM EDT (02:23 UTC)
Expired
Aug 20, 2026, 11:15 PM EDT
In force
52 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Polk County, NC, Greenville County, SC, Spartanburg County, SC

The radar

The Greer radar (KGSP), 17 km from the middle of the area, began a volume at 02:23 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 00:00Z, 2.4 hours before the alert went out and 283 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 2026-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3363 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 2026-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.1939Sfc1 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
3363 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
1521 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 8:25 PM EDTSpecial Weather StatementGSPRutherford35 min
Aug 20, 8:44 PM EDTSpecial Weather StatementGSPPolk46 min
Aug 20, 8:46 PM EDTSevere Thunderstorm WarningGSPPolk, Rutherford44 min
Aug 20, 9:08 PM EDTSpecial Weather StatementGSPPolk37 min
Aug 20, 9:10 PM EDTSpecial Weather StatementGSPHenderson35 min
Aug 20, 9:13 PM EDTSevere Thunderstorm WarningGSPHenderson, Polk47 min
Aug 20, 9:27 PM EDTSevere Thunderstorm WarningGSPPolk, Rutherford33 min
Aug 20, 9:32 PM EDTSevere Thunderstorm WarningGSPHenderson43 min
Aug 20, 9:43 PM EDTSpecial Weather StatementGSPRutherford47 min
Aug 20, 9:46 PM EDTSpecial Weather StatementGSPPolk44 min
Aug 20, 9:53 PM EDTSevere Thunderstorm WarningGSPCatawba, Iredell, Lincoln37 min
Aug 20, 10:01 PM EDTAreal Flood AdvisoryGSPRutherford3 hr
Aug 20, 10:01 PM EDTSpecial Weather StatementGSPPolk44 min
Aug 20, 10:04 PM EDTSevere Thunderstorm WarningGSPHenderson, Polk41 min
Aug 20, 11:00 PM EDTSpecial Weather StatementGSPHenderson30 min
Aug 20, 11:23 PM EDTSpecial Weather StatementGSPCleveland52 min
Aug 20, 11:33 PM EDTSpecial Weather StatementGSPGaston42 min
Aug 20, 11:43 PM EDTSpecial Weather StatementGSPLincoln32 min
Aug 20, 11:56 PM EDTSevere Thunderstorm WarningGSPGaston, Mecklenburg34 min
Aug 21, 12:09 AM EDTSpecial Weather StatementGSPTransylvania36 min
Aug 21, 12:25 AM EDTSpecial Weather StatementGSPRutherford35 min
Aug 21, 12:37 AM EDTSevere Thunderstorm WarningGSPCabarrus, Mecklenburg, Union38 min
Aug 21, 1:12 AM EDTSpecial Weather StatementGSPUnion48 min
Aug 21, 1:52 AM EDTSpecial Weather StatementGSPJackson23 min
Aug 21, 2:17 AM EDTSpecial Weather StatementGSPTransylvania28 min
Aug 21, 3:10 AM EDTSpecial Weather StatementGSPTransylvania35 min
Aug 21, 3:43 AM EDTSpecial Weather StatementGSPSwain32 min
Aug 21, 4:28 AM EDTSpecial Weather StatementGSPMacon32 min
Aug 21, 6:07 AM EDTSpecial Weather StatementGSPTransylvania23 min
Aug 21, 6:23 AM EDTSpecial Weather StatementGSPCaldwell37 min
Aug 21, 6:36 AM EDTSpecial Weather StatementGSPPolk24 min
Aug 21, 7:15 AM EDTSpecial Weather StatementGSPAlexander, Iredell30 min
Aug 21, 7:33 AM EDTSpecial Weather StatementGSPAvery, Burke, Caldwell, Cleveland, McDowell, Mitchell and 1 more42 min
Aug 21, 8:13 AM EDTSpecial Weather StatementGSPAlexander, Burke, Caldwell, Catawba, Iredell47 min
Aug 21, 9:00 AM EDTSpecial Weather StatementGSPDavie, Iredell45 min
Aug 21, 9:40 AM EDTSpecial Weather StatementGSPDavie, Rowan35 min
Aug 21, 1:56 PM EDTSpecial Weather StatementGSPCleveland34 min
Aug 21, 2:18 PM EDTSpecial Weather StatementGSPGaston, Lincoln27 min
Aug 21, 3:38 PM EDTSpecial Weather StatementGSPMecklenburg52 min
Aug 21, 3:46 PM EDTSevere Thunderstorm WarningGSPMecklenburg, Union44 min
Aug 21, 4:04 PM EDTSevere Thunderstorm WarningGSPCabarrus, Mecklenburg, Union56 min
Aug 21, 4:14 PM EDTSpecial Weather StatementGSPCabarrus46 min
Aug 21, 4:33 PM EDTSpecial Weather StatementGSPUnion27 min
Aug 21, 4:39 PM EDTAreal Flood AdvisoryGSPMecklenburg, Union4 hr
Aug 21, 4:41 PM EDTSevere Thunderstorm WarningGSPUnion49 min
Aug 21, 4:43 PM EDTSpecial Weather StatementGSPUnion47 min
Aug 21, 4:58 PM EDTSpecial Weather StatementGSPUnion17 min
Aug 21, 5:13 PM EDTAreal Flood AdvisoryGSPCabarrus, Mecklenburg, Union3 hr
Aug 21, 6:09 PM EDTSpecial Weather StatementGSPHenderson51 min
Aug 21, 6:31 PM EDTAreal Flood AdvisoryGSPBuncombe119 min
Aug 21, 6:34 PM EDTSpecial Weather StatementGSPHenderson26 min
Aug 21, 7:11 PM EDTSpecial Weather StatementGSPHenderson, Polk49 min
Aug 21, 7:47 PM EDTSevere Thunderstorm WarningGSPPolk43 min
Aug 20, 9:55 PM EDTSevere Thunderstorm WarningGSPSpartanburg20 min
Aug 20, 10:36 PM EDTSevere Thunderstorm WarningGSPGreenville12 min
Aug 21, 5:02 AM EDTSpecial Weather StatementGSPOconee43 min
Aug 21, 5:08 AM EDTSevere Thunderstorm WarningGSPOconee37 min
Aug 21, 5:18 AM EDTSpecial Weather StatementGSPPickens27 min
Aug 21, 5:39 AM EDTSpecial Weather StatementGSPOconee36 min
Aug 21, 6:09 AM EDTSpecial Weather StatementGSPPickens36 min
Aug 21, 1:07 PM EDTSpecial Weather StatementGSPGreenwood23 min
Aug 21, 1:09 PM EDTSpecial Weather StatementGSPLaurens36 min
Aug 21, 1:16 PM EDTSevere Thunderstorm WarningGSPGreenwood21 min
Aug 21, 1:27 PM EDTSpecial Weather StatementGSPSpartanburg33 min
Aug 21, 2:29 PM EDTSevere Thunderstorm WarningGSPGreenwood46 min
Aug 21, 2:31 PM EDTSpecial Weather StatementGSPLaurens29 min
Aug 21, 2:32 PM EDTSpecial Weather StatementGSPUnion28 min
Aug 21, 2:36 PM EDTSpecial Weather StatementGSPYork39 min
Aug 21, 2:44 PM EDTSevere Thunderstorm WarningGSPYork27 min
Aug 21, 3:02 PM EDTSpecial Weather StatementGSPUnion43 min
Aug 21, 3:06 PM EDTSevere Thunderstorm WarningGSPChester, Union39 min
Aug 21, 3:10 PM EDTSpecial Weather StatementGSPYork50 min
Aug 21, 3:21 PM EDTSevere Thunderstorm WarningGSPChester54 min
Aug 21, 3:52 PM EDTSevere Thunderstorm WarningGSPChester38 min
Aug 21, 4:31 PM EDTSpecial Weather StatementGSPChester14 min
Aug 21, 7:44 PM EDTSpecial Weather StatementGSPGreenville, Spartanburg46 min
Aug 21, 6:18 AM EDTSpecial Weather StatementGSPFranklin27 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2026Severe Thunderstorm Warnings in North Carolina, 2026Every severe thunderstorm warning in 2026

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.