Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 97, NWS Greenville-Spartanburg, SC

August 10, 2021Spartanburg County, Union County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 10, 2021, 7:37 PM EDT for Spartanburg County, Union County, South Carolina. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 10, 2021, 7:37 PM EDT (23:37 UTC)
Expired
Aug 10, 2021, 8:18 PM EDT
In force
41 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Spartanburg County, SC, Union County, SC

The radar

The Greer radar (KGSP), 45 km from the middle of the area, began a volume at 23:40 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 12:00Z, 11.6 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 12:00Z on 2021-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1302 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2021-08-10The 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
1302 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
948 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

723 
WUUS52 KGSP 102337
SVRGSP
SCC083-087-110030-
/O.NEW.KGSP.SV.W.0097.210810T2337Z-210811T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Greenville-Spartanburg SC
737 PM EDT Tue Aug 10 2021

The National Weather Service in Greenville-Spartanburg has issued a

* Severe Thunderstorm Warning for...
  Southeastern Spartanburg County in Upstate South Carolina...
  Northwestern Union County in Upstate South Carolina...

* Until 830 PM EDT.

* At 737 PM EDT, a severe thunderstorm was located 8 miles west of
  Union, or 4 miles west of Buffalo, moving southeast at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor hail damage to vehicles is expected. Expect wind 
           damage to trees and power lines.

* Locations impacted include...
  Union, Monarch Mill, Buffalo, Jonesville, Cross Keys and Cross
  Anchor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Brief damaging winds will blow down trees and power lines over small
areas. A brief period of large hail is also possible. Seek shelter
inside an interior room.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
minor flooding. Do not drive your vehicle through flooded roadways.

Please report damaging winds, hail, or flooding to the National
Weather Service by calling toll free, 1, 800, 2 6 7, 8 1 0 1, or by
posting on our Facebook page, or Tweet it using hashtag nwsgsp. Your
message should describe the event and the specific location where it
occurred.

&&

LAT...LON 3460 8188 3459 8189 3460 8190 3476 8193
      3487 8174 3486 8158 3470 8157 3459 8182
      3459 8184 3460 8184 3459 8186 3458 8186
TIME...MOT...LOC 2337Z 328DEG 26KT 3471 8177 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CAC
1 follow-up statement
688 
WWUS52 KGSP 110018
SVSGSP

Severe Weather Statement
National Weather Service Greenville-Spartanburg SC
818 PM EDT Tue Aug 10 2021

SCC083-087-110028-
/O.CAN.KGSP.SV.W.0097.000000T0000Z-210811T0030Z/
Spartanburg SC-Union SC-
818 PM EDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SPARTANBURG AND
NORTHWESTERN UNION COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has 
been cancelled. However heavy rain is still possible with this 
thunderstorm.

LAT...LON 3460 8188 3459 8189 3460 8190 3476 8193
      3487 8174 3486 8158 3470 8157 3459 8182
      3459 8184 3460 8184 3459 8186 3458 8186
TIME...MOT...LOC 0013Z 328DEG 26KT 3446 8158 

$$

CAC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 1:52 PM EDTSpecial Weather StatementGSPGreenwood23 min
Aug 10, 2:29 PM EDTSpecial Weather StatementGSPGreenwood31 min
Aug 10, 2:53 PM EDTSpecial Weather StatementGSPGreenwood37 min
Aug 10, 3:27 PM EDTSpecial Weather StatementGSPPickens33 min
Aug 10, 3:58 PM EDTSpecial Weather StatementGSPChester32 min
Aug 10, 4:06 PM EDTSpecial Weather StatementGSPOconee24 min
Aug 10, 4:20 PM EDTSevere Thunderstorm WarningGSPChester, York20 min
Aug 10, 6:03 PM EDTSpecial Weather StatementGSPGreenville27 min
Aug 10, 6:09 PM EDTSevere Thunderstorm WarningGSPGreenville, Laurens, Spartanburg51 min
Aug 10, 6:10 PM EDTSpecial Weather StatementGSPSpartanburg35 min
Aug 10, 6:30 PM EDTSpecial Weather StatementGSPSpartanburg30 min
Aug 10, 6:36 PM EDTSevere Thunderstorm WarningGSPCherokee, Spartanburg, Union39 min
Aug 10, 6:41 PM EDTSpecial Weather StatementGSPOconee34 min
Aug 10, 7:03 PM EDTSevere Thunderstorm WarningGSPSpartanburg23 min
Aug 10, 7:11 PM EDTSevere Thunderstorm WarningGSPAnderson, Oconee49 min
Aug 10, 7:12 PM EDTSevere Thunderstorm WarningGSPGreenville, Laurens, Spartanburg48 min
Aug 10, 7:19 PM EDTSevere Thunderstorm WarningGSPSpartanburg, Union25 min
Aug 10, 7:30 PM EDTSevere Thunderstorm WarningGSPGreenville, Laurens, Spartanburg45 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2021Every severe thunderstorm warning in 2021

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.