Alert archive / South Carolina / Tornado Warnings in 2021

Tornado Warning 13, NWS Columbia, SC

August 17, 2021Aiken County, South Carolina

NWS Columbia, SC issued this tornado warning at Aug 17, 2021, 2:08 PM EDT for Aiken County, South Carolina. It was in force for 37 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
Aug 17, 2021, 2:08 PM EDT (18:08 UTC)
Expired
Aug 17, 2021, 2:45 PM EDT
In force
37 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

County Aiken County, SC

The radar

The Columbia radar (KCAE), 44 km from the middle of the area, began a volume at 18:07 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
Aug 17, 10:42 AM EDTTornado WatchSPC8 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 6.1 hours before the alert went out and 168 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 2021-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1066 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 2021-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.1939Sfc1 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
1066 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
639 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted.

122 
WFUS52 KCAE 171808
TORCAE
SCC003-171845-
/O.NEW.KCAE.TO.W.0013.210817T1808Z-210817T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Columbia SC
208 PM EDT Tue Aug 17 2021

The National Weather Service in Columbia has issued a

* Tornado Warning for...
  Northeastern Aiken County in central South Carolina...

* Until 245 PM EDT.
    
* At 207 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Aiken State Park, or 9 miles east of Aiken Mall,
  moving north at 35 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  northeastern Aiken County, including the following locations... New
  Holland, Windsor and Monetta.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3348 8167 3384 8163 3388 8157 3386 8154
      3383 8153 3381 8151 3380 8146 3377 8143
      3374 8143 3373 8141 3372 8136 3345 8145
TIME...MOT...LOC 1807Z 190DEG 31KT 3355 8155 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$
1 follow-up statement
364 
WWUS52 KCAE 171811
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
211 PM EDT Tue Aug 17 2021

SCC003-171845-
/O.CON.KCAE.TO.W.0013.000000T0000Z-210817T1845Z/
Aiken SC-
211 PM EDT Tue Aug 17 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM EDT FOR
NORTHEASTERN AIKEN COUNTY...
        
At 210 PM EDT, a confirmed large and extremely dangerous tornado was
located near Aiken State Park, or 10 miles east of Aiken, moving
north at 35 mph.

This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

IMPACT...You are in a life-threatening situation. Flying debris may 
         be deadly to those caught without shelter. Mobile homes 
         will be destroyed. Considerable damage to homes, 
         businesses, and vehicles is likely and complete destruction 
         is possible.

Locations impacted include...
Aiken State Park, Monetta and New Holland. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a large, extremely dangerous and potentially deadly
tornado is on the ground. To protect your life, TAKE COVER NOW! Move
to a basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 3356 8163 3384 8163 3388 8157 3386 8154
      3383 8153 3381 8151 3380 8146 3377 8143
      3374 8143 3373 8141 3372 8136 3354 8142
TIME...MOT...LOC 1810Z 190DEG 31KT 3358 8154 

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
MAX HAIL SIZE...0.00 IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 12:31 PM EDTAreal Flood AdvisoryCAEAiken, Edgefield, McCormick, Saluda59 min
Aug 17, 12:59 PM EDTTornado WarningCAEEdgefield46 min
Aug 17, 1:34 PM EDTAreal Flood AdvisoryCAEAiken, Edgefield, Saluda56 min
Aug 17, 1:44 PM EDTTornado WarningCAEEdgefield, McCormick, Saluda17 min
Aug 17, 1:55 PM EDTTornado WarningCAEAiken, Edgefield, Lexington, Saluda50 min
Aug 17, 2:31 PM EDTTornado WarningCAEBarnwell44 min
Aug 17, 3:12 PM EDTTornado WarningCAELexington, Saluda48 min
Aug 17, 3:17 PM EDTAreal Flood AdvisoryCAEAiken, Edgefield, Lexington, Newberry, Saluda58 min
Aug 17, 3:48 PM EDTTornado WarningCAEFairfield, Lexington, Newberry, Richland42 min
Aug 17, 4:25 PM EDTSevere Thunderstorm WarningCAEFairfield, Newberry50 min
Aug 17, 4:31 PM EDTAreal Flood AdvisoryCAEFairfield, Lexington, Newberry, Richland, Saluda59 min
Aug 17, 4:48 PM EDTSevere Thunderstorm WarningCAEBamberg, Orangeburg42 min
Aug 17, 4:56 PM EDTTornado WarningCAEOrangeburg34 min
Aug 17, 5:29 PM EDTAreal Flood AdvisoryCAECalhoun, Kershaw, Lexington, Richland3 hr
Aug 17, 5:29 PM EDTTornado WarningCAECalhoun, Orangeburg46 min
Aug 17, 7:43 PM EDTSpecial Weather StatementCAEAiken32 min

Nearby

Tornado Warnings in South Carolina, 2021Every tornado warning in 2021Tornadoes 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.