Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 32, NWS Columbia, SC

May 4, 2021Calhoun County, Lexington County, Richland County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at May 4, 2021, 3:52 PM EDT for Calhoun County, Lexington County, Richland County, South Carolina. It was in force for 41 min. 3 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
May 4, 2021, 3:52 PM EDT (19:52 UTC)
Expired
May 4, 2021, 4:33 PM EDT
In force
41 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Calhoun County, SC, Lexington County, SC, Richland County, SC

The radar

The Columbia radar (KCAE), 10 km from the middle of the area, began a volume at 19:55 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

TimeReportWhereRemark
May 4, 4:05 PM EDTTSTM WND DMG2 S Lexington, SCSC HIGHWAY PATROL REPORTS TREES IN ROADWAY AT I20 EXIT 55. TIME ESTIMATED BY RADAR.
May 4, 4:12 PM EDTTSTM WND GST 652 Ssw Springdale, SCAIRPORT ASOS MEASURED 65 MPH PEAK GUST.
May 4, 4:21 PM EDTTSTM WND DMG3 Ene Saint Andrews, SCHIGHWAY PATROL REPORTS TREE BLOCKING ROADWAY NEAR I20 AND MONTICELLO RD.

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

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 7.9 hours before the alert went out and 152 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2021-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 573 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2021-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

767 
WUUS52 KCAE 041952
SVRCAE
SCC017-063-079-042045-
/O.NEW.KCAE.SV.W.0032.210504T1952Z-210504T2045Z/

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

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Northwestern Calhoun County in central South Carolina...
  Lexington County in central South Carolina...
  Central Richland County in central South Carolina...

* Until 445 PM EDT.

* At 352 PM EDT, a severe thunderstorm was located 7 miles west of
  Gaston, or 8 miles south of Red Bank, moving northeast 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...
  Columbia, Lexington, West Columbia, Cayce, Irmo, Forest Acres,
  Batesburg-Leesville, Springdale, St. Andrews, Highway 6 at Lake
  Murray Dam, Red Bank, Oak Grove, South Congaree, Pine Ridge,
  Gaston, Hopkins, Columbia International University, Harbison State
  Forest, Riverbanks Zoo and SC State Farmer's Market.

This includes the following highways...
 Interstate 126 between mile markers 0 and 3.
 Interstate 20 in South Carolina between mile markers 42 and 70.
 Interstate 26 between mile markers 102 and 125.
 Interstate 77 between mile markers 0 and 12.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3368 8119 3392 8151 3414 8111 3392 8080
TIME...MOT...LOC 1952Z 228DEG 30KT 3381 8123 

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

JAQ
2 follow-up statements
456 
WWUS52 KCAE 042005
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
405 PM EDT Tue May 4 2021

SCC017-063-079-042045-
/O.CON.KCAE.SV.W.0032.000000T0000Z-210504T2045Z/
Calhoun SC-Lexington SC-Richland SC-
405 PM EDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTHWESTERN CALHOUN...CENTRAL LEXINGTON AND CENTRAL RICHLAND
COUNTIES...

At 405 PM EDT, a severe thunderstorm was located over South Congaree,
or near Springdale, moving northeast at 40 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...
Columbia, Lexington, West Columbia, Cayce, Irmo, Forest Acres,
Batesburg-Leesville, Springdale, St. Andrews, Highway 6 at Lake
Murray Dam, Red Bank, Oak Grove, South Congaree, Pine Ridge, Gaston,
Hopkins, Columbia International University, Harbison State Forest,
Riverbanks Zoo and SC State Farmer's Market.

This includes the following highways...
 Interstate 126 between mile markers 0 and 3.
 Interstate 20 in South Carolina between mile markers 44 and 70.
 Interstate 26 between mile markers 102 and 125.
 Interstate 77 between mile markers 0 and 12.

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 3374 8109 3392 8151 3414 8111 3392 8080
TIME...MOT...LOC 2005Z 231DEG 34KT 3392 8115 

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

JAQ
054 
WWUS52 KCAE 042033
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
433 PM EDT Tue May 4 2021

SCC017-063-079-042042-
/O.CAN.KCAE.SV.W.0032.000000T0000Z-210504T2045Z/
Calhoun SC-Lexington SC-Richland SC-
433 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CALHOUN...CENTRAL
LEXINGTON AND CENTRAL RICHLAND COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning and produced a 65 
mph wind gust at the Columbia Metropolitan Airport has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3374 8109 3392 8151 3414 8111 3392 8080
TIME...MOT...LOC 2029Z 228DEG 30KT 3407 8095 

$$

JAQ

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 3:29 PM EDTSpecial Weather StatementCAESaluda31 min
May 4, 3:42 PM EDTSpecial Weather StatementCAELexington33 min
May 4, 3:45 PM EDTSevere Thunderstorm WarningCAELexington, Newberry, Richland, Saluda45 min
May 4, 3:50 PM EDTSpecial Weather StatementCAENewberry25 min
May 4, 3:54 PM EDTSpecial Weather StatementCAEMcCormick36 min
May 4, 3:54 PM EDTSevere Thunderstorm WarningCAELancaster36 min
May 4, 4:00 PM EDTSevere Thunderstorm WarningCAEFairfield, Newberry, Saluda45 min
May 4, 4:16 PM EDTSevere Thunderstorm WarningCAEFairfield, Kershaw, Lancaster, Newberry, Richland59 min
May 4, 4:22 PM EDTSevere Thunderstorm WarningCAEChesterfield, Fairfield, Kershaw, Lancaster, Lee53 min
May 4, 4:38 PM EDTSevere Thunderstorm WarningCAEEdgefield, McCormick, Saluda53 min
May 4, 4:46 PM EDTSevere Thunderstorm WarningCAEFairfield, Lexington, Newberry, Richland44 min
May 4, 5:03 PM EDTSevere Thunderstorm WarningCAEChesterfield, Kershaw, Lancaster, Lee57 min
May 4, 5:30 PM EDTSevere Thunderstorm WarningCAEAiken, Barnwell, Lexington, Orangeburg60 min
May 4, 6:03 PM EDTSevere Thunderstorm WarningCAEBamberg, Barnwell, Calhoun, Orangeburg, Richland57 min
May 4, 6:07 PM EDTSevere Thunderstorm WarningCAEClarendon, Lee, Richland, Sumter53 min
May 4, 6:57 PM EDTSevere Thunderstorm WarningCAEClarendon48 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2021Every 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.