Alert archive / South Carolina / Tornado Warnings in 2020

Tornado Warning 26, NWS Columbia, SC

September 17, 2020Calhoun County, Clarendon County, Orangeburg County, South Carolina

NWS Columbia, SC issued this tornado warning at Sep 17, 2020, 12:56 PM EDT for Calhoun County, Clarendon County, Orangeburg County, South Carolina. It was in force for 36 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
Sep 17, 2020, 12:56 PM EDT (16:56 UTC)
Expired
Sep 17, 2020, 1:32 PM EDT
In force
36 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Calhoun County, SC, Clarendon County, SC, Orangeburg County, SC

The radar

The Columbia radar (KCAE), 67 km from the middle of the area, began a volume at 17:01 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
Sep 17, 10:20 AM EDTTornado WatchSPC8 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 4.9 hours before the alert went out and 90 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 2020-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1154 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 2020-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 188 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
1154 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
652 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
188 m²/s²
0-3 km storm-relative helicity
261 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.7

Open this sounding in Storm Lab

The text

As transmitted.

916 
WFUS52 KCAE 171656
TORCAE
SCC017-027-075-171745-
/O.NEW.KCAE.TO.W.0026.200917T1656Z-200917T1745Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Columbia SC
1256 PM EDT Thu Sep 17 2020

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...
  Central Orangeburg County in central South Carolina...

* Until 145 PM EDT.
    
* At 1256 PM EDT, a severe thunderstorm capable of producing a
  tornado was located near Bowman, or 11 miles southeast of
  Brookdale, moving north at 40 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 dangerous storm will be near...
  Elloree around 110 PM EDT.
  Santee State Park around 115 PM EDT.

Other locations impacted by this tornadic thunderstorm include Poplar
Creek Landing, Creston, Stumphole Landing, Yonder Field, Cameron,
Lone Star, Low Falls Landing and Santee.

This includes Interstate 26 between mile markers 151 and 165.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! If you are outdoors, in a mobile home, or in a
vehicle, move to an interior room or closet on the lowest floor of a
sturdy building immediately.

&&

LAT...LON 3332 8061 3337 8081 3370 8072 3366 8055
      3365 8054 3365 8052 3362 8038
TIME...MOT...LOC 1656Z 201DEG 35KT 3341 8068 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

JAQ
2 follow-up statements
308 
WWUS52 KCAE 171716
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
116 PM EDT Thu Sep 17 2020

SCC017-027-075-171745-
/O.CON.KCAE.TO.W.0026.000000T0000Z-200917T1745Z/
Calhoun SC-Clarendon SC-Orangeburg SC-
116 PM EDT Thu Sep 17 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM EDT FOR
SOUTHEASTERN CALHOUN...WEST CENTRAL CLARENDON AND CENTRAL ORANGEBURG
COUNTIES...
    
At 116 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Elloree, or 15 miles east of Brookdale, moving
northeast at 40 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 central Orangeburg
Counties, including the following locations... Creston, Stumphole
Landing, Lone Star, Low Falls Landing and Poplar Creek Landing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! If you are outdoors, in a mobile home, or in a
vehicle, move to an interior room or closet on the lowest floor of a
sturdy building immediately.

&&

LAT...LON 3349 8056 3352 8067 3368 8063 3366 8055
      3365 8054 3365 8052 3363 8044
TIME...MOT...LOC 1716Z 202DEG 34KT 3358 8059 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

JAQ
353 
WWUS52 KCAE 171732
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
132 PM EDT Thu Sep 17 2020

SCC017-027-075-171742-
/O.CAN.KCAE.TO.W.0026.000000T0000Z-200917T1745Z/
Calhoun SC-Clarendon SC-Orangeburg SC-
132 PM EDT Thu Sep 17 2020

...THE TORNADO WARNING FOR SOUTHEASTERN CALHOUN...WEST CENTRAL
CLARENDON AND CENTRAL ORANGEBURG COUNTIES 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.

A Tornado Watch remains in effect until 600 PM EDT for central South
Carolina.

LAT...LON 3349 8056 3352 8067 3368 8063 3366 8055
      3365 8054 3365 8052 3363 8044
TIME...MOT...LOC 1731Z 201DEG 35KT 3373 8052 

$$

awp

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 16, 11:22 PM EDTRiver Flood AdvisoryCAELexington, Richland46 hr
Sep 17, 7:56 AM EDTTornado WarningCAERichland, Sumter34 min
Sep 17, 8:09 AM EDTTornado Warning Tornado observedCAECalhoun, Richland, Sumter21 min
Sep 17, 8:30 AM EDTFlash Flood WarningCAEAiken, Edgefield, McCormick3 hr
Sep 17, 9:22 AM EDTFlash Flood WarningCAEAiken, Barnwell, Edgefield, McCormick, Newberry, Saluda3 hr
Sep 17, 9:33 AM EDTTornado WarningCAECalhoun, Orangeburg27 min
Sep 17, 9:46 AM EDTRiver Flood WarningCAECalhoun, Lexington, Richland35 hr
Sep 17, 9:46 AM EDTRiver Flood WarningCAECalhoun, Richland3 days
Sep 17, 9:46 AM EDTRiver Flood WarningCAEEdgefield, McCormick12 hr
Sep 17, 10:00 AM EDTTornado WarningCAECalhoun, Clarendon, Orangeburg45 min
Sep 17, 10:28 AM EDTFlash Flood WarningCAEBamberg, Calhoun, Clarendon, Orangeburg, Richland, Sumter3 hr
Sep 17, 10:38 AM EDTFlash Flood WarningCAEAiken, Bamberg, Barnwell, Calhoun, Fairfield, Kershaw and 6 more3 hr
Sep 17, 10:44 AM EDTTornado WarningCAEClarendon, Sumter46 min
Sep 17, 11:01 AM EDTTornado WarningCAEClarendon, Sumter29 min
Sep 17, 11:27 AM EDTTornado WarningCAELee, Sumter48 min
Sep 17, 11:44 AM EDTTornado WarningCAECalhoun, Clarendon, Orangeburg, Sumter46 min
Sep 17, 12:06 PM EDTFlash Flood WarningCAEClarendon, Kershaw, Lee, Richland, Sumter3 hr
Sep 17, 12:39 PM EDTTornado WarningCAEClarendon, Sumter33 min
Sep 17, 1:11 PM EDTTornado WarningCAESumter49 min
Sep 17, 1:34 PM EDTFlash Flood WarningCAECalhoun, Clarendon, Orangeburg, Richland, Sumter3 hr
Sep 17, 2:37 PM EDTSevere Thunderstorm WarningCAELee, Sumter23 min
Sep 17, 2:52 PM EDTSevere Thunderstorm WarningCAEClarendon40 min
Sep 17, 3:02 PM EDTTornado WarningCAEClarendon, Sumter28 min
Sep 17, 3:19 PM EDTFlash Flood WarningCAEClarendon, Lee, Sumter3 hr
Sep 17, 5:45 PM EDTAreal Flood AdvisoryCAEClarendon, Orangeburg, Sumter60 min
Sep 17, 6:08 PM EDTSpecial Weather StatementCAEClarendon22 min

Nearby

Tornado Warnings in South Carolina, 2020Every tornado warning in 2020Tornadoes in 2020

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.