Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 91, NWS Greenville-Spartanburg, SC

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

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 10, 2021, 6:36 PM EDT for Cherokee County, Spartanburg County, Union County, South Carolina. It was in force for 39 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 10, 2021, 6:36 PM EDT (22:36 UTC)
Expired: Aug 10, 2021, 7:15 PM EDT
In force: 39 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cherokee County, SC, Spartanburg County, SC, Union County, SC

The radar

The Greer radar (KGSP), 39 km from the middle of the area, began a volume at 22:37 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.

What was reported inside it

Time	Report	Where	Remark
Aug 10, 7:08 PM EDT	TSTM WND DMG	3 Ese Pacolet, SC	911 CALL CENTER REPORTED TREES DOWN IN UNION COUNTY, SC.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.6 hours before the alert went out and 215 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: 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.

437 
WUUS52 KGSP 102236
SVRGSP
SCC021-083-087-102315-
/O.NEW.KGSP.SV.W.0091.210810T2236Z-210810T2315Z/

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

The National Weather Service in Greenville-Spartanburg has issued a

* Severe Thunderstorm Warning for...
  East central Spartanburg County in Upstate South Carolina...
  Southwestern Cherokee County in Upstate South Carolina...
  North central Union County in Upstate South Carolina...

* Until 715 PM EDT.

* At 636 PM EDT, a severe thunderstorm was located 8 miles southwest
  of Gaffney, or near Pacolet Mills, moving east at 20 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...
  Pacolet, Pacolet Mills, Croft State Park, Cedar Springs, Thicketty
  and Spartanburg.

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 3486 8192 3497 8191 3505 8162 3484 8158
TIME...MOT...LOC 2236Z 270DEG 19KT 3496 8172 

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

$$

CAC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 1:52 PM EDT	Special Weather Statement	GSP	Greenwood	23 min
Aug 10, 2:29 PM EDT	Special Weather Statement	GSP	Greenwood	31 min
Aug 10, 2:53 PM EDT	Special Weather Statement	GSP	Greenwood	37 min
Aug 10, 3:27 PM EDT	Special Weather Statement	GSP	Pickens	33 min
Aug 10, 3:58 PM EDT	Special Weather Statement	GSP	Chester	32 min
Aug 10, 4:06 PM EDT	Special Weather Statement	GSP	Oconee	24 min
Aug 10, 4:20 PM EDT	Severe Thunderstorm Warning	GSP	Chester, York	20 min
Aug 10, 6:03 PM EDT	Special Weather Statement	GSP	Greenville	27 min
Aug 10, 6:09 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Laurens, Spartanburg	51 min
Aug 10, 6:10 PM EDT	Special Weather Statement	GSP	Spartanburg	35 min
Aug 10, 6:30 PM EDT	Special Weather Statement	GSP	Spartanburg	30 min
Aug 10, 6:41 PM EDT	Special Weather Statement	GSP	Oconee	34 min
Aug 10, 7:03 PM EDT	Severe Thunderstorm Warning	GSP	Spartanburg	23 min
Aug 10, 7:11 PM EDT	Severe Thunderstorm Warning	GSP	Anderson, Oconee	49 min
Aug 10, 7:12 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Laurens, Spartanburg	48 min
Aug 10, 7:19 PM EDT	Severe Thunderstorm Warning	GSP	Spartanburg, Union	25 min
Aug 10, 7:30 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Laurens, Spartanburg	45 min
Aug 10, 7:37 PM EDT	Severe Thunderstorm Warning	GSP	Spartanburg, Union	41 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.