Alert archive / South Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 307, NWS Greenville-Spartanburg, SC

August 13, 2020Laurens County, Spartanburg County, Union County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 13, 2020, 8:26 PM EDT for Laurens County, Spartanburg County, Union County, South Carolina. It was in force for 19 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 13, 2020, 8:26 PM EDT (00:26 UTC)
Expired
Aug 13, 2020, 8:45 PM EDT
In force
19 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Laurens County, SC, Spartanburg County, SC, Union County, SC

The radar

The Greer radar (KGSP), 38 km from the middle of the area, began a volume at 00:28 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.4 hours before the alert went out and 235 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, Greensboro/Hi Pt, NC at 00:00Z on 2020-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 712 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, Greensboro/Hi Pt, NC at 00:00Z on 2020-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 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
712 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
927 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
23 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 13, 7:58 PM EDT, 28 minutes earlier.

Area forecast discussion, Aug 13, 7:58 PM EDT, 28 minutes before
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Hazardous weather outlook, Aug 13, 4:59 PM EDT, 3 hours 27 minutes before
Hazardous Weather Outlook
National Weather Service Greenville-Spartanburg SC
459 PM EDT Thu Aug 13 2020

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-142100-
Rabun-Habersham-Stephens-Franklin-Hart-Elbert-Avery-Alexander-
Iredell-Davie-Madison-Yancey-Mitchell-Swain-Haywood-Buncombe-Catawba-
Rowan-Graham-Northern Jackson-Macon-Southern Jackson-Transylvania-
Henderson-Cleveland-Lincoln-Gaston-Mecklenburg-Cabarrus-Union NC-
Caldwell Mountains-Greater Caldwell-Burke Mountains-Greater Burke-
McDowell Mountains-Eastern McDowell-Rutherford Mountains-
Greater Rutherford-Polk Mountains-Eastern Polk-Oconee Mountains-
Pickens Mountains-Greenville Mountains-Greater Oconee-
Greater Pickens-Greater Greenville-Spartanburg-Cherokee-York-
Anderson-Abbeville-Laurens-Union SC-Chester-Greenwood-
459 PM EDT Thu Aug 13 2020

This Hazardous Weather Outlook is for northeast Georgia, Piedmont
North Carolina, western North Carolina, and Upstate South Carolina.

.DAY ONE...Tonight.

Scattered to numerous showers and thunderstorms will continue to
develop across the region through the evening hours, with coverage
slowly diminishing through the early morning hours. The primary
threats with these storms will be frequent cloud to ground lightning,
locally heavy rainfall, and gusty winds. Storms and heavy rain
showers will occasionally become stationary, posing a threat of
excessive rainfall and flash flooding, especially in locations that
have received heavy rainfall over the past few days.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

None.

HG

In the hours before

Local storm report, Aug 13, 7:38 PM EDT, 48 minutes before
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Local storm report, Aug 13, 7:45 PM EDT, 41 minutes before
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Local storm report, Aug 13, 7:53 PM EDT, 33 minutes before
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Special weather statement, Aug 13, 7:57 PM EDT, 29 minutes before
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Special weather statement, Aug 13, 8:04 PM EDT, 22 minutes before
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Special weather statement, Aug 13, 8:14 PM EDT, 12 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 2:16 AM EDTAreal Flood AdvisoryGSPTransylvania3 hr
Aug 14, 3:43 AM EDTFlash Flood WatchGSPAlexander, Avery, Burke, Caldwell, Catawba, Davie and 3 more41 hr
Aug 14, 4:39 PM EDTSpecial Weather StatementGSPRowan36 min
Aug 13, 8:04 PM EDTSpecial Weather StatementGSPUnion26 min
Aug 13, 8:14 PM EDTSpecial Weather StatementGSPUnion31 min
Aug 13, 8:47 PM EDTSpecial Weather StatementGSPLaurens43 min
Aug 13, 9:15 PM EDTSpecial Weather StatementGSPLaurens45 min
Aug 13, 9:32 PM EDTSpecial Weather StatementGSPAbbeville, Greenwood43 min
Aug 13, 10:00 PM EDTSpecial Weather StatementGSPAnderson30 min
Aug 13, 10:14 PM EDTSpecial Weather StatementGSPGreenwood46 min
Aug 13, 10:38 PM EDTSpecial Weather StatementGSPAnderson52 min
Aug 13, 10:50 PM EDTSpecial Weather StatementGSPOconee40 min
Aug 13, 10:02 PM EDTSpecial Weather StatementGSPRabun28 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2020Every severe thunderstorm warning in 2020

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.