Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 38, NWS Columbia, SC

May 4, 20214 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at May 4, 2021, 4:46 PM EDT for 4 counties in South Carolina. It was in force for 44 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, 4:46 PM EDT (20:46 UTC)
Expired
May 4, 2021, 5:30 PM EDT
In force
44 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Fairfield County, SC, Lexington County, SC, Newberry County, SC, Richland County, SC

The radar

The Columbia radar (KCAE), 23 km from the middle of the area, began a volume at 20:48 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 nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 8.8 hours before the alert went out and 179 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.

803 
WUUS52 KCAE 042046
SVRCAE
SCC039-063-071-079-042130-
/O.NEW.KCAE.SV.W.0038.210504T2046Z-210504T2130Z/

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

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Southwestern Fairfield County in central South Carolina...
  Southeastern Newberry County in central South Carolina...
  Central Lexington County in central South Carolina...
  Northern Richland County in central South Carolina...

* Until 530 PM EDT.

* At 446 PM EDT, severe thunderstorms were located along a line
  extending from near Jenkinsville to 7 miles south of Prosperity,
  moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Columbia, Lexington, West Columbia, Cayce, Irmo, Forest Acres,
  Springdale, St. Andrews, Dentsville, Oak Grove, Highway 6 at Lake
  Murray Dam, Red Bank, South Congaree, Pine Ridge, Gaston, Arcadia
  Lakes, Columbia International University, Jenkinsville, Harbison
  State Forest and Sesquicentennial State Park.

This includes the following highways...
 Interstate 126 between mile markers 0 and 3.
 Interstate 20 in South Carolina between mile markers 51 and 82.
 Interstate 26 between mile markers 84 and 120.
 Interstate 77 between mile markers 0 and 26.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Severe thunderstorms can produce large capsizing waves and frequent
lightning. If on or near Lake Murray move away from the water and
take shelter!

&&

LAT...LON 3407 8074 3381 8112 3404 8149 3407 8147
      3408 8148 3407 8150 3408 8153 3408 8154
      3413 8161 3434 8123
TIME...MOT...LOC 2046Z 284DEG 38KT 3428 8121 3410 8155 

HAIL...<.75IN
WIND...60MPH
 
$$

JAQ
1 follow-up statement
151 
WWUS52 KCAE 042121
SVSCAE

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

SCC039-063-071-079-042131-
/O.EXP.KCAE.SV.W.0038.000000T0000Z-210504T2130Z/
Fairfield SC-Newberry SC-Lexington SC-Richland SC-
521 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN FAIRFIELD...
SOUTHEASTERN NEWBERRY...CENTRAL LEXINGTON AND NORTHERN RICHLAND
COUNTIES WILL EXPIRE AT 530 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central South Carolina.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Columbia.

LAT...LON 3407 8074 3381 8112 3404 8149 3407 8147
      3408 8148 3407 8150 3408 8153 3408 8154
      3413 8161 3434 8123
TIME...MOT...LOC 2121Z 284DEG 38KT 3419 8080 3401 8114 

$$

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, 3:52 PM EDTSevere Thunderstorm WarningCAECalhoun, Lexington, Richland41 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.