Alert archive / South Carolina / Tornado Warnings in 2020

Tornado Warning 29, NWS Columbia, SC

September 25, 2020Chesterfield County, Kershaw County, South Carolina

NWS Columbia, SC issued this tornado warning at Sep 25, 2020, 3:57 PM EDT for Chesterfield County, Kershaw County, South Carolina. It was in force for 33 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 25, 2020, 3:57 PM EDT (19:57 UTC)
Expired: Sep 25, 2020, 4:30 PM EDT
In force: 33 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Chesterfield County, SC, Kershaw County, SC

The radar

The Columbia radar (KCAE), 89 km from the middle of the area, began a volume at 19:57 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, 8.0 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 102 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 908 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

089 
WFUS52 KCAE 251957
TORCAE
SCC025-055-252030-
/O.NEW.KCAE.TO.W.0029.200925T1957Z-200925T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Columbia SC
357 PM EDT Fri Sep 25 2020

The National Weather Service in Columbia has issued a

* Tornado Warning for...
  South central Chesterfield County in central South Carolina...
  East central Kershaw County in central South Carolina...

* Until 430 PM EDT.
    
* At 356 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Cassatt, or 13 miles northwest of Bishopville,
  moving northeast at 20 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
  south central Chesterfield and east central Kershaw Counties,
  including the following locations... Bethune and Mcbee.

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 3437 8028 3434 8033 3434 8036 3432 8037
      3441 8043 3453 8022 3443 8017
TIME...MOT...LOC 1956Z 244DEG 18KT 3439 8036 

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

$$

fwa

2 follow-up statements

523 
WWUS52 KCAE 252014
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
414 PM EDT Fri Sep 25 2020

SCC025-055-252030-
/O.CON.KCAE.TO.W.0029.000000T0000Z-200925T2030Z/
Chesterfield SC-Kershaw SC-
414 PM EDT Fri Sep 25 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR SOUTH
CENTRAL CHESTERFIELD AND NORTHEASTERN KERSHAW COUNTIES...
    
At 412 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Clyde, or 11 miles west of Hartsville, moving
northeast at 20 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...
Mcbee and Bethune. 

The public reported some rotation near Casset as the storm passed 
by, but did not touch down.

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 3437 8028 3434 8033 3445 8036 3453 8022
      3443 8017
TIME...MOT...LOC 2012Z 244DEG 18KT 3443 8027 

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

$$

fwa

746 
WWUS52 KCAE 252031
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
431 PM EDT Fri Sep 25 2020

SCC025-055-252039-
/O.EXP.KCAE.TO.W.0029.000000T0000Z-200925T2030Z/
Chesterfield SC-Kershaw SC-
431 PM EDT Fri Sep 25 2020

...THE TORNADO WARNING FOR SOUTH CENTRAL CHESTERFIELD AND
NORTHEASTERN KERSHAW COUNTIES WILL EXPIRE AT 430 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

We are watching another thunderstorm near Bethune with some 
rotation, but it is not strong enough to require a tornado warning 
at this time. A warning may be needed soon if the storm strengthens.


LAT...LON 3437 8028 3434 8033 3445 8036 3453 8022
      3443 8017
TIME...MOT...LOC 2029Z 244DEG 18KT 3447 8018 

$$

fwa

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 25, 3:52 PM EDT	Special Weather Statement	CAE	Chesterfield	53 min
Sep 25, 4:28 PM EDT	Areal Flood Advisory	CAE	Clarendon, Orangeburg	2 hr
Sep 25, 4:34 PM EDT	Special Weather Statement	CAE	Chesterfield	41 min

Nearby

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