Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 36, NWS Columbia, SC

May 4, 20215 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at May 4, 2021, 4:22 PM EDT for 5 counties in South Carolina. It was in force for 53 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: May 4, 2021, 4:22 PM EDT (20:22 UTC)
Expired: May 4, 2021, 5:15 PM EDT
In force: 53 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Chesterfield County, SC, Fairfield County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC

The radar

The Columbia radar (KCAE), 87 km from the middle of the area, began a volume at 20:21 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
May 4, 4:37 PM EDT	TSTM WND DMG	9 Sse Kershaw, SC	MULTIPLE POWER LINES DOWN ACROSS LOCKHART RD NEAR NORTH CENTRAL MIDDLE SCHOOL. PHOTO SENT VIA SOCIAL MEDIA.

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 175 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: 463 J/kg
Mixed-layer CIN: -235 J/kg
Mixed-layer LCL: 935 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

558 
WUUS52 KCAE 042022
SVRCAE
SCC025-039-055-057-061-042115-
/O.NEW.KCAE.SV.W.0036.210504T2022Z-210504T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Columbia SC
422 PM EDT Tue May 4 2021

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Northeastern Fairfield County in central South Carolina...
  Lancaster County in central South Carolina...
  Northwestern Lee County in central South Carolina...
  Northwestern Chesterfield County in central South Carolina...
  Northern Kershaw County in central South Carolina...

* Until 515 PM EDT.

* At 421 PM EDT, a severe thunderstorm was located near Fishing Creek
  Reservoir, or near Lancaster, moving east at 30 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, Pageland, Kershaw, Elgin, Heath Springs, Westville, USC
  Lancaster, Irwin, Cassatt, Mt Pisgah, Buford, Jefferson, North
  Central High School, Bell Town Fire Station, Arrowood Estates,
  Faith Christian School, Midway Elementary School, Bear Creek Park,
  McDonald Green Elementary School and High Point Fire Station.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection seek shelter inside a sturdy building and stay
away from windows.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways or
walk through high water.

&&

LAT...LON 3481 8036 3424 8043 3454 8088 3457 8087
      3460 8089 3467 8089 3469 8086 3475 8088
      3482 8063
TIME...MOT...LOC 2021Z 266DEG 26KT 3464 8084 

HAIL...1.00IN
WIND...60MPH
 
$$

JAQ

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 3:29 PM EDT	Special Weather Statement	CAE	Saluda	31 min
May 4, 3:42 PM EDT	Special Weather Statement	CAE	Lexington	33 min
May 4, 3:45 PM EDT	Severe Thunderstorm Warning	CAE	Lexington, Newberry, Richland, Saluda	45 min
May 4, 3:50 PM EDT	Special Weather Statement	CAE	Newberry	25 min
May 4, 3:52 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Lexington, Richland	41 min
May 4, 3:54 PM EDT	Special Weather Statement	CAE	McCormick	36 min
May 4, 3:54 PM EDT	Severe Thunderstorm Warning	CAE	Lancaster	36 min
May 4, 4:00 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Newberry, Saluda	45 min
May 4, 4:16 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Lancaster, Newberry, Richland	59 min
May 4, 4:38 PM EDT	Severe Thunderstorm Warning	CAE	Edgefield, McCormick, Saluda	53 min
May 4, 4:46 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Lexington, Newberry, Richland	44 min
May 4, 5:03 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Kershaw, Lancaster, Lee	57 min
May 4, 5:30 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell, Lexington, Orangeburg	60 min
May 4, 6:03 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Barnwell, Calhoun, Orangeburg, Richland	57 min
May 4, 6:07 PM EDT	Severe Thunderstorm Warning	CAE	Clarendon, Lee, Richland, Sumter	53 min
May 4, 6:57 PM EDT	Severe Thunderstorm Warning	CAE	Clarendon	48 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.