Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 31, NWS Columbia, SC

May 4, 20214 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at May 4, 2021, 3:45 PM EDT for 4 counties in South Carolina. It was in force for 45 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, 3:45 PM EDT (19:45 UTC)
Expired
May 4, 2021, 4:30 PM EDT
In force
45 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Lexington County, SC, Newberry County, SC, Richland County, SC, Saluda County, SC

The radar

The Columbia radar (KCAE), 36 km from the middle of the area, began a volume at 19:46 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 Sse Chapin, SCSC HIGHWAY PATROL REPORTS TREES BLOCKING ROADWAY AT OLD LEXINGTON HIGHWAY AND SID BRICKLEY RD. TIME ESTIMATED BY RADAR.
May 4, 4:14 PM EDTTSTM WND DMG4 N Lake Murray Of Rich, SCNUMEROUS TREES SNAPPED AND UPROOTED IN PORTRAIT HILL NEIGHBORHOOD.
May 4, 4:15 PM EDTTSTM WND DMG2 S Chapin, SCRETIRED NWS EMPLOYEE REPORTS PARTIAL ROOFING AND SIDING RIPPED FROM HOUSES NEAR CHAPIN ELEMENTARY SCHOOL AS WELL AS SEVERAL TREES DOWN. TIME ESTIMATED BY RADAR.

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, 7.8 hours before the alert went out and 192 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.

591 
WUUS52 KCAE 041945
SVRCAE
SCC063-071-079-081-042030-
/O.NEW.KCAE.SV.W.0031.210504T1945Z-210504T2030Z/

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

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Southeastern Newberry County in central South Carolina...
  Northwestern Lexington County in central South Carolina...
  Eastern Saluda County in central South Carolina...
  Northwestern Richland County in central South Carolina...

* Until 430 PM EDT.

* At 345 PM EDT, a severe thunderstorm was located near Saluda, or 9
  miles northwest of Batesburg-Leesville, 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...
  Irmo, Batesburg-Leesville, Saluda, Prosperity, Dreher Island State
  Park, Ballentine, Chapin, Little Mountain, Pomaria, Peak, Cedar
  Grove Fire Station, South Shore Marina, Oswald Park, Saluda Co
  Sheriff's Office, Bundrick Island, Putnam's Landing, White Rock,
  Rocky Point Recreation Area, Hollywood Elementary School and Emory.

This includes Interstate 26 between mile markers 80 and 100.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck by lightning.

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 3437 8139 3435 8137 3431 8136 3430 8134
      3427 8134 3424 8131 3423 8128 3420 8125
      3420 8122 3418 8118 3419 8117 3414 8111
      3385 8164 3398 8181
TIME...MOT...LOC 1945Z 228DEG 30KT 3397 8169 

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

JAQ
2 follow-up statements
816 
WWUS52 KCAE 042003
SVSCAE

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

SCC063-071-079-081-042030-
/O.CON.KCAE.SV.W.0031.000000T0000Z-210504T2030Z/
Newberry SC-Lexington SC-Saluda SC-Richland SC-
403 PM EDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHEASTERN NEWBERRY...NORTHWESTERN LEXINGTON...NORTHEASTERN
SALUDA AND NORTHWESTERN RICHLAND COUNTIES...

At 403 PM EDT, a severe thunderstorm was located near Dreher Island
State Park, or 11 miles southwest of VC Summer Nuclear Station,
moving northeast at 45 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...
Irmo, Batesburg-Leesville, Prosperity, Dreher Island State Park,
Ballentine, Chapin, Little Mountain, Pomaria, Peak, Cedar Grove Fire
Station, South Shore Marina, Oswald Park, Bundrick Island, Putnam's
Landing, White Rock, Rocky Point Recreation Area, Hollywood
Elementary School, Delmar, Hollow Creek Public Park and Melvin Park.

This includes Interstate 26 between mile markers 80 and 101.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Excessive cloud to ground lightning is occurring with this storm. If
you can hear thunder, you are close enough to be struck by lightning.

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

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 3437 8139 3435 8137 3431 8136 3430 8134
      3427 8134 3424 8131 3423 8128 3420 8125
      3420 8122 3418 8118 3419 8117 3414 8111
      3392 8151 3403 8175
TIME...MOT...LOC 2003Z 227DEG 41KT 3417 8144 

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

JAQ
168 
WWUS52 KCAE 042032
SVSCAE

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

SCC063-071-079-081-042041-
/O.EXP.KCAE.SV.W.0031.000000T0000Z-210504T2030Z/
Newberry SC-Lexington SC-Saluda SC-Richland SC-
432 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN NEWBERRY...
NORTHWESTERN LEXINGTON...NORTHEASTERN SALUDA AND NORTHWESTERN
RICHLAND COUNTIES HAS EXPIRED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been allowed to expire.

LAT...LON 3437 8139 3435 8137 3431 8136 3430 8134
      3427 8134 3424 8131 3423 8128 3420 8125
      3420 8122 3418 8118 3419 8117 3414 8111
      3392 8151 3403 8175
TIME...MOT...LOC 2031Z 228DEG 30KT 3432 8124 

$$

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, 3:50 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, 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.