Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 43, NWS Columbia, SC

May 4, 2021Clarendon County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at May 4, 2021, 6:57 PM EDT for Clarendon County, South Carolina. It was in force for 48 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: May 4, 2021, 6:57 PM EDT (22:57 UTC)
Expired: May 4, 2021, 7:45 PM EDT
In force: 48 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Clarendon County, SC

The radar

The Columbia radar (KCAE), 97 km from the middle of the area, began a volume at 23:01 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 4, 4:56 PM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 11.0 hours before the alert went out and 81 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: 573 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1000 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

512 
WUUS52 KCAE 042257
SVRCAE
SCC027-042345-
/O.NEW.KCAE.SV.W.0043.210504T2257Z-210504T2345Z/

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

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Clarendon County in central South Carolina...

* Until 745 PM EDT.

* At 657 PM EDT, a severe thunderstorm was located over Manning,
  moving east at 35 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...
  Manning, Summerton, Santee Cooper Regional Airport, Alcolu,
  Turbeville, Paxville, Gable, Davis Station and Foreston.

This includes Interstate 95 between mile markers 106 and 133.
 
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 3382 7992 3377 7999 3372 7997 3350 8010
      3350 8012 3348 8015 3346 8013 3345 8021
      3344 8020 3344 8027 3345 8028 3343 8032
      3344 8039 3346 8040 3377 8036 3379 8027
      3394 7998 3388 7994 3388 7988
TIME...MOT...LOC 2257Z 251DEG 29KT 3366 8019 

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, 4:22 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Fairfield, Kershaw, Lancaster, Lee	53 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

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.