Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 164, NWS Greenville-Spartanburg, SC

August 31, 20214 counties in South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 31, 2021, 4:23 PM EDT for 4 counties in South Carolina. It was in force for 37 min. 5 reports 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 31, 2021, 4:23 PM EDT (20:23 UTC)
Expired: Aug 31, 2021, 5:00 PM EDT
In force: 37 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Greer radar (KGSP), 46 km from the middle of the area, began a volume at 20:22 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 31, 4:28 PM EDT	TSTM WND DMG	1 Se Spartanburg, SC	TREE DOWN AT HUDSON ST AND GEORGIA ST. TREE ALSO DOWN ON WHITNEY RD.
Aug 31, 4:43 PM EDT	TSTM WND DMG	1 Ne Gaffney, SC	TREE DOWN ON N GRANARD ST.
Aug 31, 4:43 PM EDT	TSTM WND DMG	2 Ene Cowpens, SC	TREES DOWN ON LOVE SPRINGS RD.
Aug 31, 4:48 PM EDT	TSTM WND DMG	4 E Mayo, SC	TREES DOWN ALONG MACEDONIA RD
Aug 31, 4:53 PM EDT	TSTM WND DMG	1 Ne Blacksburg, SC	TREE DOWN ON A HOUSE ON N MOUNTAIN ST.

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, 8.4 hours before the alert went out and 211 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: 379 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1017 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

339 
WUUS52 KGSP 312023
SVRGSP
SCC021-083-087-091-312100-
/O.NEW.KGSP.SV.W.0164.210831T2023Z-210831T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Greenville-Spartanburg SC
423 PM EDT Tue Aug 31 2021

The National Weather Service in Greenville-Spartanburg has issued a

* Severe Thunderstorm Warning for...
  Northwestern York County in Upstate South Carolina...
  Central Spartanburg County in Upstate South Carolina...
  Cherokee County in Upstate South Carolina...
  Northwestern Union County in Upstate South Carolina...

* Until 500 PM EDT.

* At 423 PM EDT, severe thunderstorms were located along a line
  extending from 5 miles south of Spartanburg to 15 miles south of
  Gaffney to 5 miles southeast of Union, moving north at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and power lines.

* Locations impacted include...
  Spartanburg, Gaffney, Union, Boiling Springs SC, Pacolet, Cowpens,
  Monarch Mill, Blacksburg, Mayo and Roebuck.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

A few trees and power lines will be blown down in the warned area.
Storms will be accompanied by brief heavy rainfall, and little or no
lightning. Seek shelter inside an interior room.

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 3471 8175 3478 8209 3519 8195 3517 8148
      3508 8132 3454 8166
TIME...MOT...LOC 2023Z 198DEG 43KT 3488 8196 3485 8168 3466 8158 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MOORE

1 follow-up statement

909 
WWUS52 KGSP 312040
SVSGSP

Severe Weather Statement
National Weather Service Greenville-Spartanburg SC
440 PM EDT Tue Aug 31 2021

SCC021-083-087-091-312100-
/O.CON.KGSP.SV.W.0164.000000T0000Z-210831T2100Z/
York SC-Spartanburg SC-Cherokee SC-Union SC-
440 PM EDT Tue Aug 31 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR NORTHWESTERN YORK...NORTHEASTERN SPARTANBURG...CHEROKEE AND
NORTHEASTERN UNION COUNTIES...

At 438 PM EDT, severe thunderstorms were located along a line
extending from 4 miles north of Spartanburg to 6 miles south of
Gaffney to 5 miles northeast of Union, moving north at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated. Wind damage has been reported with the 
         passage of this line of storms across Laurens County. 
         
IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Spartanburg, Gaffney, Boiling Springs SC, Pacolet, Cowpens, Monarch
Mill, Blacksburg, Mayo, Chesnee and Pacolet Mills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

A few trees and power lines will be blown down in the warned area.
Storms will be accompanied by brief heavy rainfall, and little or no
lightning. Seek shelter inside an interior room.

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 3485 8169 3494 8200 3519 8195 3517 8148
      3508 8132 3469 8156
TIME...MOT...LOC 2038Z 194DEG 40KT 3501 8194 3498 8166 3479 8156 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MOORE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 2:01 PM EDT	Special Weather Statement	GSP	Oconee, Pickens	29 min
Aug 31, 2:27 PM EDT	Special Weather Statement	GSP	Anderson, Oconee	33 min
Aug 31, 2:49 PM EDT	Special Weather Statement	GSP	Abbeville, Greenwood	41 min
Aug 31, 3:01 PM EDT	Severe Thunderstorm Warning	GSP	Abbeville, Greenwood, Laurens	44 min
Aug 31, 3:27 PM EDT	Special Weather Statement	GSP	Laurens	48 min
Aug 31, 3:36 PM EDT	Special Weather Statement	GSP	Pickens	24 min
Aug 31, 3:39 PM EDT	Severe Thunderstorm Warning	GSP	Laurens, Spartanburg, Union	51 min
Aug 31, 3:45 PM EDT	Special Weather Statement	GSP	Chester	30 min
Aug 31, 4:11 PM EDT	Special Weather Statement	GSP	Greenville, Spartanburg	34 min
Aug 31, 4:30 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Spartanburg	45 min
Aug 31, 4:53 PM EDT	Severe Thunderstorm Warning	GSP	Cherokee, York	37 min
Aug 31, 5:16 PM EDT	Special Weather Statement	GSP	Chester, York	29 min
Aug 31, 6:07 PM EDT	Special Weather Statement	GSP	Chester	38 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.