Alert archive / South Carolina / Tornado Warnings in 2017

Tornado Warning 20, NWS Wilmington, NC

October 23, 2017Horry County, South Carolina

NWS Wilmington, NC issued this tornado warning at Oct 23, 2017, 10:20 PM EDT for Horry County, South Carolina. It was in force for 25 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 23, 2017, 10:20 PM EDT (02:20 UTC)
Expired: Oct 23, 2017, 10:45 PM EDT
In force: 25 min
Issued by: NWS Wilmington, NC
Area: Storm-based polygon
Tornado: Radar indicated

County Horry County, SC

The radar

The Wilmington radar (KLTX), 42 km from the middle of the area, began a volume at 02:23 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.

What was reported inside it

Time	Report	Where	Remark
Oct 23, 10:27 PM EDT	TORNADO	1 Nnw Nixonville, SC	NWS STORM SURVEY CONFIRMS A TORNADO TOUCHDOWN BETWEEN INMAN CIRCLE AND THE WACCAMAW RIVER. DETAILS ARE AVAILABLE IN A PUBLIC INFORMATION STATEMENT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 2.3 hours before the alert went out and 153 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: 659 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 835 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 334 m²/s²
0-3 km storm-relative helicity: 424 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 8.9

Open this sounding in Storm Lab

The text

As transmitted.

576 
WFUS52 KILM 240220
TORILM
SCC051-240245-
/O.NEW.KILM.TO.W.0020.171024T0220Z-171024T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Wilmington NC
1020 PM EDT MON OCT 23 2017

The National Weather Service in Wilmington has issued a

* Tornado Warning for...
  Central Horry County in northeastern South Carolina...

* Until 1045 PM EDT
    
* At 1019 PM EDT, a severe thunderstorm capable of producing a
  tornado was located near Nixonville, or near Red Hill, moving
  northeast at 40 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

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

* Locations impacted include...
  Myrtle Beach, Conway, Red Hill, Loris, Hickory Grove, Horry
  Georgetown Technical College Conway Campus, Hand, Nixonville,
  Wampee, Longs, Hammond, Coastal Carolina University, Goretown,
  Barefoot Landing Area Of North Myrtle Beach, Lighthouse Care Center
  Of Conway, Conway Medical Center and Grand Strand Regional Medical
  Center.

This includes the following highways...
 SC Highway 31 between mile markers 6 and 17.
 SC Highway 22 between mile markers 12 and 26.

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 7907 3411 7884 3405 7877 3393 7864
      3370 7887
TIME...MOT...LOC 0219Z 215DEG 33KT 3381 7894 

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

$$

DCH

2 follow-up statements

428 
WWUS52 KILM 240231
SVSILM

Severe Weather Statement
National Weather Service Wilmington NC
1031 PM EDT MON OCT 23 2017

SCC051-240245-
/O.CON.KILM.TO.W.0020.000000T0000Z-171024T0245Z/
Horry SC-
1031 PM EDT MON OCT 23 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT FOR CENTRAL
HORRY COUNTY...
    
At 1031 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Hammond, or 10 miles northwest of North Myrtle Beach
Airport, moving northeast at 40 mph.

HAZARD...TORNADO. 

SOURCE...Radar indicated rotation. 

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

Locations impacted include...
Loris, Hickory Grove, Longs, Hammond, Goretown, Hand and Nixonville. 

This includes SC Highway 22 between mile markers 12 and 25.
 
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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 3411 7884 3405 7877 3394 7865 3380 7885
      3388 7902
TIME...MOT...LOC 0231Z 215DEG 33KT 3390 7886 

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

$$

DCH

696 
WWUS52 KILM 240245
SVSILM

Severe Weather Statement
National Weather Service Wilmington NC
1045 PM EDT MON OCT 23 2017

SCC051-240255-
/O.EXP.KILM.TO.W.0020.000000T0000Z-171024T0245Z/
Horry SC-
1045 PM EDT MON OCT 23 2017

...THE TORNADO WARNING FOR CENTRAL HORRY COUNTY HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.  However gusty winds are still possible with
this thunderstorm.

LAT...LON 3411 7884 3405 7877 3394 7865 3380 7885
      3388 7902
TIME...MOT...LOC 0245Z 215DEG 33KT 3400 7878 

$$

DCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 23, 8:11 PM EDT	Special Weather Statement	ILM	Florence, Williamsburg	49 min
Oct 23, 9:05 PM EDT	Special Weather Statement	ILM	Florence	40 min
Oct 23, 9:26 PM EDT	Severe Thunderstorm Warning	ILM	Horry	49 min
Oct 23, 9:57 PM EDT	Severe Thunderstorm Warning	ILM	Horry	38 min
Oct 23, 10:06 PM EDT	Special Weather Statement	ILM	Horry	24 min
Oct 23, 10:27 PM EDT	Special Weather Statement	ILM	Dillon	63 min
Oct 24, 12:35 AM EDT	Special Marine Warning	ILM		55 min
Oct 24, 12:46 AM EDT	Special Marine Warning	ILM		59 min
Oct 24, 1:46 AM EDT	Special Marine Warning	ILM		89 min

Nearby

Tornado Warnings in South Carolina, 2017 Every tornado warning in 2017 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.