Alert archive / South Carolina / Tornado Warnings in 2020

Tornado Warning 29, NWS Wilmington, NC

October 11, 2020Florence County, Horry County, Marion County, South Carolina

NWS Wilmington, NC issued this tornado warning at Oct 11, 2020, 1:59 PM EDT for Florence County, Horry County, Marion County, South Carolina. It was in force for 12 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 11, 2020, 1:59 PM EDT (17:59 UTC)
Expired: Oct 11, 2020, 2:11 PM EDT
In force: 12 min
Issued by: NWS Wilmington, NC
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Florence County, SC, Horry County, SC, Marion County, SC

The radar

The Wilmington radar (KLTX), 96 km from the middle of the area, began a volume at 18:02 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, 6.0 hours before the alert went out and 122 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: 228 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 753 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

973 
WFUS52 KILM 111759
TORILM
SCC041-051-067-111830-
/O.NEW.KILM.TO.W.0029.201011T1759Z-201011T1830Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Wilmington NC
159 PM EDT Sun Oct 11 2020

The National Weather Service in Wilmington has issued a

* Tornado Warning for...
  Southeastern Florence County in northeastern South Carolina...
  West central Horry County in northeastern South Carolina...
  Central Marion County in northeastern South Carolina...

* Until 230 PM EDT.
    
* At 159 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Hannah, or 13 miles east of Lake City, moving
  northeast at 20 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Expect damage to mobile homes, roofs, and vehicles.

* This dangerous storm will be near...
  Kingsburg and Poston around 210 PM EDT.
  Gresham around 220 PM EDT.
  Brittons Neck around 225 PM EDT.

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 3380 7955 3390 7963 3411 7939 3391 7921
TIME...MOT...LOC 1759Z 234DEG 19KT 3388 7953 

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

$$

21

1 follow-up statement

645 
WWUS52 KILM 111811
SVSILM

Severe Weather Statement
National Weather Service Wilmington NC
211 PM EDT Sun Oct 11 2020

SCC041-051-067-111821-
/O.CAN.KILM.TO.W.0029.000000T0000Z-201011T1830Z/
Florence SC-Horry SC-Marion SC-
211 PM EDT Sun Oct 11 2020

...THE TORNADO WARNING FOR SOUTHEASTERN FLORENCE...WEST CENTRAL HORRY
AND CENTRAL MARION 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.

LAT...LON 3380 7955 3390 7963 3411 7939 3391 7921
TIME...MOT...LOC 1809Z 234DEG 19KT 3392 7947 

$$

21

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 11, 1:31 PM EDT	Special Weather Statement	ILM	Darlington	29 min
Oct 11, 1:43 PM EDT	Special Weather Statement	ILM	Darlington	32 min
Oct 11, 2:13 PM EDT	Special Weather Statement	ILM	Darlington	32 min
Oct 11, 2:25 PM EDT	Special Weather Statement	ILM	Marlboro	50 min
Oct 11, 2:31 PM EDT	Special Weather Statement	ILM	Marion	44 min
Oct 11, 2:43 PM EDT	Special Weather Statement	ILM	Dillon	47 min
Oct 11, 3:15 PM EDT	Tornado Warning	ILM	Dillon	30 min
Oct 11, 3:34 PM EDT	Areal Flood Advisory	ILM	Horry, Marion	116 min
Oct 11, 3:37 PM EDT	Tornado Warning	ILM	Horry	23 min
Oct 11, 3:46 PM EDT	Special Weather Statement	ILM	Dillon	44 min
Oct 11, 4:32 PM EDT	Tornado Warning	ILM	Horry	43 min
Oct 11, 4:35 PM EDT	Areal Flood Advisory	ILM	Horry	85 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.