Alert archive / South Carolina / Tornado Warnings in 2019

Tornado Warning 49, NWS Wilmington, NC

October 20, 2019Horry County, South Carolina

NWS Wilmington, NC issued this tornado warning at Oct 20, 2019, 1:40 AM EDT for Horry County, South Carolina. It was in force for 35 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 20, 2019, 1:40 AM EDT (05:40 UTC)
Expired: Oct 20, 2019, 2:15 AM EDT
In force: 35 min
Issued by: NWS Wilmington, NC
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Horry County, SC

The radar

The Wilmington radar (KLTX), 40 km from the middle of the area, began a volume at 05:40 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 20, 1:52 AM EDT	TORNADO	1 Ssw Myrtle Beach, SC	NWS STORM SURVEY FOUND THAT A TORNADO RATED EF0 TOUCHED DOWN IN MYRTLE BEACH. THE SURVEY FOUND NUMEROUS LIMBS DOWN WITH A FEW LARGE HARDWOOD TREES SNAPPED. ESTIMATED WIND SPEEDS WITH THIS TORNADO WERE 85 MPH. MORE INFORMATION WILL BE AVAILABLE WITH A PUBLIC IN

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, 5.7 hours before the alert went out and 151 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: 3 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 514 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 297 m²/s²
0-3 km storm-relative helicity: 571 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

203 
WFUS52 KILM 200540
TORILM
SCC051-200615-
/O.NEW.KILM.TO.W.0049.191020T0540Z-191020T0615Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Wilmington NC
140 AM EDT Sun Oct 20 2019

The National Weather Service in Wilmington has issued a

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

* Until 215 AM EDT.
    
* At 140 AM EDT, a severe thunderstorm capable of producing a tornado
  was located near Springmaid Pier, moving north at 40 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

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

* This dangerous storm will be near...
  Myrtle Beach around 145 AM EDT.
  Nixonville around 155 AM EDT.
  North Myrtle Beach, North Myrtle Beach Airport, Hand and Barefoot 
  Landing Area Of North Myrtle Beach around 200 AM EDT.
  Wampee and Hammond around 205 AM EDT.

Other locations impacted by this tornadic thunderstorm include
Briarcliffe Acres, Atlantic Beach and Grand Strand Regional Medical
Center.

This includes the following highways...
 SC Highway 31 between mile markers 7 and 24.
 SC Highway 22 between mile markers 17 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 3395 7890 3390 7865 3380 7871 3377 7877
      3374 7882 3364 7893
TIME...MOT...LOC 0540Z 196DEG 36KT 3365 7886 

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

$$

21

2 follow-up statements

112 
WWUS52 KILM 200557
SVSILM

Severe Weather Statement
National Weather Service Wilmington NC
157 AM EDT Sun Oct 20 2019

SCC051-200615-
/O.CON.KILM.TO.W.0049.000000T0000Z-191020T0615Z/
Horry SC-
157 AM EDT Sun Oct 20 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 215 AM EDT FOR SOUTH
CENTRAL HORRY COUNTY...
    
At 157 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Hand, or near North Myrtle Beach Airport, moving
north at 40 mph.

HAZARD...TORNADO.

SOURCE...Radar indicated rotation.

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

This dangerous storm will be near...
  Hand around 200 AM EDT.
  Hammond around 205 AM EDT.

Other locations impacted by this tornadic thunderstorm include Grand
Strand Regional Medical Center.

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 3395 7890 3392 7875 3377 7879 3374 7882
      3371 7892
TIME...MOT...LOC 0557Z 196DEG 36KT 3382 7880 

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

$$

21

244 
WWUS52 KILM 200609
SVSILM

Severe Weather Statement
National Weather Service Wilmington NC
209 AM EDT Sun Oct 20 2019

SCC051-200619-
/O.EXP.KILM.TO.W.0049.000000T0000Z-191020T0615Z/
Horry SC-
209 AM EDT Sun Oct 20 2019

...THE TORNADO WARNING FOR SOUTH CENTRAL HORRY COUNTY WILL EXPIRE AT
215 AM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible.

LAT...LON 3395 7890 3392 7875 3377 7879 3374 7882
      3371 7892
TIME...MOT...LOC 0609Z 196DEG 36KT 3392 7876 

$$

MCK

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 20, 1:20 AM EDT	Tornado Warning	ILM	Horry	14 min
Oct 20, 2:19 AM EDT	Areal Flood Advisory	ILM	Horry	3 hr
Oct 20, 2:43 AM EDT	Areal Flood Advisory	ILM	Horry	2 hr

Nearby

Tornado Warnings in South Carolina, 2019 Every tornado warning in 2019 Tornadoes in 2019

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.