Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 42, NWS Columbia, SC

May 4, 20214 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at May 4, 2021, 6:07 PM EDT for 4 counties in South Carolina. It was in force for 53 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, 6:07 PM EDT (22:07 UTC)
Expired
May 4, 2021, 7:00 PM EDT
In force
53 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Clarendon County, SC, Lee County, SC, Richland County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 78 km from the middle of the area, began a volume at 22:06 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.

IssuedProductOfficeLasted
May 4, 4:56 PM EDTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.1 hours before the alert went out and 120 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°0°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.

576 
WUUS52 KCAE 042207
SVRCAE
SCC027-061-079-085-042300-
/O.NEW.KCAE.SV.W.0042.210504T2207Z-210504T2300Z/

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

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Lee County in central South Carolina...
  Clarendon County in central South Carolina...
  Sumter County in central South Carolina...
  Southeastern Richland County in central South Carolina...

* Until 700 PM EDT.

* At 607 PM EDT, severe thunderstorms were located along a line
  extending from near Clyde to near St. Matthews, moving southeast 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...
  Sumter, Manning, Bishopville, South Sumter, Shaw Air Base, McEntire
  Air Base, Summerton, Eastover, Oakland, Mulberry, Congaree National
  Park, Alcolu, Woods Bay State Park, Santee Cooper Regional Airport,
  Elliott, Lee State Park, Sumter County Airport, Gadsden, Millwood
  and Poinsett State Park.

This includes the following highways...
 Interstate 20 in South Carolina between mile markers 106 and 125.
 Interstate 95 between mile markers 102 and 146.

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 Marion move away from the water and
take shelter!

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

&&

LAT...LON 3377 7999 3348 8015 3346 8013 3343 8036
      3377 8066 3376 8078 3384 8092 3410 8064
      3410 8058 3418 8046 3428 8043 3436 8029
      3432 8024 3437 8018 3423 8011 3415 8015
      3400 7990 3395 7998 3388 7994 3388 7988
TIME...MOT...LOC 2207Z 294DEG 41KT 3434 8023 3359 8080 

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

JAQ
2 follow-up statements
906 
WWUS52 KCAE 042227
SVSCAE

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

SCC079-042236-
/O.CAN.KCAE.SV.W.0042.000000T0000Z-210504T2300Z/
Richland SC-
627 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN RICHLAND COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

Report any hail, damaging winds or flooding directly to the Columbia 
National Weather Service at 803 234 4115 when it is safe to do so.
You can also send reports by Facebook or Twitter to NWSColumbia or 
by e-mail at NWS.Columbia@noaa.gov.

LAT...LON 3377 7999 3348 8015 3346 8013 3343 8036
      3371 8061 3415 8015 3400 7990 3395 7998
      3388 7994 3388 7988
TIME...MOT...LOC 2226Z 301DEG 46KT 3403 8006 3360 8048 

$$

SCC027-061-085-042300-
/O.CON.KCAE.SV.W.0042.000000T0000Z-210504T2300Z/
Lee SC-Clarendon SC-Sumter SC-
627 PM EDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHEASTERN LEE...CLARENDON AND CENTRAL SUMTER COUNTIES...

At 626 PM EDT, severe thunderstorms were located along a line
extending from near Cartersville to near Santee State Park, moving
southeast at 55 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...
Sumter, Manning, South Sumter, Summerton, Alcolu, Woods Bay State
Park, Santee Cooper Regional Airport, Elliott, Mulberry, Millwood,
Turbeville, Mayesville, Pinewood, Lynchburg, Paxville, Rimini,
Brogdon, Oswego, St. Paul and Lakewood.

This includes Interstate 95 between mile markers 102 and 146.
 
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 Marion move away from the water and
take shelter!

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

&&

LAT...LON 3377 7999 3348 8015 3346 8013 3343 8036
      3371 8061 3415 8015 3400 7990 3395 7998
      3388 7994 3388 7988
TIME...MOT...LOC 2226Z 301DEG 46KT 3403 8006 3360 8048 

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

JAQ
166 
WWUS52 KCAE 042245
SVSCAE

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

SCC061-085-042255-
/O.CAN.KCAE.SV.W.0042.000000T0000Z-210504T2300Z/
Lee SC-Sumter SC-
645 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEE AND CENTRAL
SUMTER COUNTIES IS CANCELLED...
    
The severe thunderstorms which prompted the warning have moved out 
of the warned area. Therefore, the warning has been cancelled.

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

Report any hail, damaging winds or flooding directly to the Columbia 
National Weather Service at 803 234 4115 when it is safe to do so.
You can also send reports by Facebook or Twitter to NWSColumbia or 
by e-mail at NWS.Columbia@noaa.gov.

LAT...LON 3377 7999 3348 8015 3346 8013 3343 8036
      3363 8054 3371 8048 3371 8045 3374 8045
      3373 8043 3371 8043 3372 8039 3377 8040
      3379 8027 3385 8018 3394 7998 3388 7994
      3388 7988
TIME...MOT...LOC 2245Z 249DEG 24KT 3363 8034 

$$

SCC027-042300-
/O.CON.KCAE.SV.W.0042.000000T0000Z-210504T2300Z/
Clarendon SC-
645 PM EDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR CLARENDON COUNTY...

At 645 PM EDT, a severe thunderstorm was located over Summerton, or 8
miles southwest of Manning, moving east at 25 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, Rimini, Gable, St. Paul, Davis Station and
Indian Bluff Recreation Park.

This includes Interstate 95 between mile markers 102 and 134.
 
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 Marion 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 3377 7999 3348 8015 3346 8013 3343 8036
      3363 8054 3371 8048 3371 8045 3374 8045
      3373 8043 3371 8043 3372 8039 3377 8040
      3379 8027 3385 8018 3394 7998 3388 7994
      3388 7988
TIME...MOT...LOC 2245Z 249DEG 24KT 3363 8034 

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

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, 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, 6:57 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.