Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 77, NWS Columbia, SC

September 8, 2021Lancaster County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Sep 8, 2021, 2:10 PM EDT for Lancaster County, South Carolina. It was in force for 50 min. 2 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: Sep 8, 2021, 2:10 PM EDT (18:10 UTC)
Expired: Sep 8, 2021, 3:00 PM EDT
In force: 50 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Lancaster County, SC

The radar

The Columbia radar (KCAE), 95 km from the middle of the area, began a volume at 18:10 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
Sep 8, 2:30 PM EDT	HAIL 1	3 S Elgin, SC	PUBLIC REPORTED QUARTER SIZED HAIL NEAR MCILWAIN RD AND SENTRY RD. TIME ESTIMATED.
Sep 8, 2:33 PM EDT	HAIL 0.7	3 Wsw Elgin, SC	DIME SIZED HAIL REPORTED AT MCDONALD GREEN ELEMENTARY SCHOOL.

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, 6.2 hours before the alert went out and 168 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: 1161 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

613 
WUUS52 KCAE 081810
SVRCAE
SCC057-081900-
/O.NEW.KCAE.SV.W.0077.210908T1810Z-210908T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Columbia SC
210 PM EDT Wed Sep 8 2021

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Southern Lancaster County in central South Carolina...

* Until 300 PM EDT.

* At 210 PM EDT, a severe thunderstorm was located near Elgin, or
  near Lancaster, moving northeast at 10 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Lancaster, Elgin, Heath Springs, Irwin, Buford, Tradesville, Camp
  Creek Fire Station, Antioch, Kirk Air Base, Faith Christian School,
  Forty Acre Rock Preserve, Taxahaw, Pleasant Hill, Kershaw
  Correctional Institution, Unity Fire Station, Lancaster Mill, Bear
  Creek Park and McDonald Green Elementary School.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3479 8055 3476 8051 3471 8049 3466 8043
      3464 8043 3463 8042 3451 8074 3454 8074
      3453 8077 3466 8088 3482 8067 3482 8057
TIME...MOT...LOC 1810Z 235DEG 10KT 3463 8075 

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

$$

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 8, 1:45 PM EDT	Special Weather Statement	CAE	Aiken	45 min
Sep 8, 2:23 PM EDT	Areal Flood Advisory	CAE	Aiken, Edgefield, McCormick	112 min
Sep 8, 3:47 PM EDT	Special Weather Statement	CAE	Fairfield, Kershaw	43 min
Sep 8, 4:32 PM EDT	Areal Flood Advisory	CAE	Aiken	118 min
Sep 8, 4:36 PM EDT	Areal Flood Advisory	CAE	Fairfield, Kershaw, Lancaster	114 min
Sep 8, 4:57 PM EDT	Special Weather Statement	CAE	Chesterfield	33 min
Sep 8, 5:39 PM EDT	Areal Flood Advisory	CAE	Chesterfield	76 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.