Alert archive / South Carolina / Tornado Warnings in 2017

Tornado Warning 29, NWS Columbia, SC

October 23, 2017Calhoun County, Clarendon County, Sumter County, South Carolina

NWS Columbia, SC issued this tornado warning at Oct 23, 2017, 1:13 PM EDT for Calhoun County, Clarendon County, Sumter County, South Carolina. It was in force for 29 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
Oct 23, 2017, 1:13 PM EDT (17:13 UTC)
Expired
Oct 23, 2017, 1:42 PM EDT
In force
29 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Calhoun County, SC, Clarendon County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 64 km from the middle of the area, began a volume at 17:12 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, 5.2 hours before the alert went out and 95 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 2017-10-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 252 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 2017-10-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 square meters per square second.193958Sfc1 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
252 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
739 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

224 
WFUS52 KCAE 231713
TORCAE
SCC017-027-085-231800-
/O.NEW.KCAE.TO.W.0029.171023T1713Z-171023T1800Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Columbia SC
113 PM EDT MON OCT 23 2017

The National Weather Service in Columbia has issued a

* Tornado Warning for...
  Southeastern Calhoun County in central South Carolina...
  West central Clarendon County in central South Carolina...
  Southwestern Sumter County in central South Carolina...

* Until 200 PM EDT
    
* At 112 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Elloree, or 14 miles east of Brookdale, moving
  north at 30 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
  southeastern Calhoun...west central Clarendon and southwestern
  Sumter Counties, including the following locations: Pinewood and
  Privateer.

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 3381 8041 3363 8048 3355 8053 3356 8054
      3356 8058 3355 8061 3354 8059 3352 8060
      3353 8064 3384 8057
TIME...MOT...LOC 1712Z 195DEG 26KT 3355 8058 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

CJR
2 follow-up statements
246 
WWUS52 KCAE 231731
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
131 PM EDT MON OCT 23 2017

SCC017-027-231740-
/O.CAN.KCAE.TO.W.0029.000000T0000Z-171023T1800Z/
Calhoun SC-Clarendon SC-
131 PM EDT MON OCT 23 2017

...THE TORNADO WARNING FOR SOUTHEASTERN CALHOUN AND WEST CENTRAL
CLARENDON COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 3370 8049 3369 8050 3367 8050 3365 8053
      3365 8054 3366 8056 3368 8056 3368 8058
      3370 8059 3384 8057 3381 8043
TIME...MOT...LOC 1730Z 195DEG 25KT 3367 8054 

$$

SCC085-231800-
/O.CON.KCAE.TO.W.0029.000000T0000Z-171023T1800Z/
Sumter SC-
131 PM EDT MON OCT 23 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 PM EDT FOR
SOUTHWESTERN SUMTER COUNTY...
    
At 130 PM EDT, a severe thunderstorm capable of producing a tornado
was located 10 miles north of Elloree, or 18 miles west of Manning,
moving north at 30 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. 

Locations impacted include...
Pinewood.

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 3370 8049 3369 8050 3367 8050 3365 8053
      3365 8054 3366 8056 3368 8056 3368 8058
      3370 8059 3384 8057 3381 8043
TIME...MOT...LOC 1730Z 195DEG 25KT 3367 8054 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

CJR
178 
WWUS52 KCAE 231742
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
142 PM EDT MON OCT 23 2017

SCC085-231752-
/O.CAN.KCAE.TO.W.0029.000000T0000Z-171023T1800Z/
Sumter SC-
142 PM EDT MON OCT 23 2017

...THE TORNADO WARNING FOR SOUTHWESTERN SUMTER COUNTY IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.

LAT...LON 3370 8049 3369 8050 3367 8050 3365 8053
      3365 8054 3366 8056 3368 8056 3368 8058
      3370 8059 3384 8057 3381 8043
TIME...MOT...LOC 1741Z 195DEG 26KT 3376 8051 

$$

CJR

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 23, 12:39 PM EDTTornado WarningCAECalhoun, Orangeburg36 min
Oct 23, 3:35 PM EDTSevere Thunderstorm WarningCAEBamberg, Orangeburg40 min
Oct 23, 4:10 PM EDTTornado WarningCAECalhoun, Orangeburg35 min
Oct 23, 5:05 PM EDTSpecial Weather StatementCAELancaster55 min
Oct 23, 6:01 PM EDTSpecial Weather StatementCAEBamberg, Orangeburg44 min
Oct 23, 6:02 PM EDTSpecial Weather StatementCAEKershaw, Lancaster28 min
Oct 23, 6:18 PM EDTSevere Thunderstorm WarningCAECalhoun, Orangeburg57 min
Oct 23, 6:52 PM EDTSpecial Weather StatementCAEChesterfield, Kershaw, Lee, Sumter53 min
Oct 23, 7:51 PM EDTSpecial Weather StatementCAEChesterfield39 min
Oct 23, 7:54 PM EDTSpecial Weather StatementCAEClarendon66 min

Nearby

Tornado Warnings in South Carolina, 2017Every tornado warning in 2017Tornadoes in 2017

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.