Alert archive / South Carolina / Tornado Warnings in 2011

Tornado Warning 23, NWS Wilmington, NC

May 10, 2011Horry County, South Carolina

NWS Wilmington, NC issued this tornado warning at May 10, 2011, 5:39 PM EDT for Horry County, South Carolina. It was in force for 30 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: May 10, 2011, 5:39 PM EDT (21:39 UTC)
Expired: May 10, 2011, 6:09 PM EDT
In force: 30 min
Issued by: NWS Wilmington, NC
Area: Storm-based polygon

County Horry County, SC

The radar

The Wilmington radar (KLTX), 41 km from the middle of the area, began a volume at 21:42 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
May 10, 5:50 PM EDT	HAIL 2.5	4 Ssw Longs, SC	GOLFBALL TO TENNIS BALL SIZE HAIL. HAIL TORE THE GUTTERS OFF THE HOUSE AND DAMAGED A CAR.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 10, 3:20 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 9.7 hours before the alert went out and 149 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: 904 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

329 
WFUS52 KILM 102139
TORILM
SCC051-102230-
/O.NEW.KILM.TO.W.0023.110510T2139Z-110510T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WILMINGTON NC
539 PM EDT TUE MAY 10 2011

THE NATIONAL WEATHER SERVICE IN WILMINGTON NC HAS ISSUED A

* TORNADO WARNING FOR...
  HORRY COUNTY IN NORTHEAST SOUTH CAROLINA

* UNTIL 630 PM EDT

* AT 537 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR HAND...OR
  ABOUT 9 MILES NORTHWEST OF NORTH MYRTLE BEACH...MOVING SOUTHWEST AT
  20 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
   MYRTLE BEACH...
   SOCASTEE...

IN ADDITION TO THE TORNADO POTENTIAL...THIS STORM HAS PRODUCED 
GOLFBALL SIZE HAIL IN NORTH MYRTLE BEACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT 
TUESDAY EVENING FOR SOUTHEAST NORTH CAROLINA AND NORTHEAST SOUTH 
CAROLINA.

&&

PLEASE REPORT HAIL...DOWNED TREES OR DAMAGING WINDS TO THE NATIONAL
WEATHER SERVICE IN WILMINGTON NC...TOLL FREE AT 877-633-6772...WHEN
YOU CAN DO SO SAFELY.

LAT...LON 3372 7905 3401 7881 3384 7858 3383 7859
      3384 7860 3377 7875 3373 7882 3362 7896
TIME...MOT...LOC 2139Z 029DEG 18KT 3387 7881

$$

RAS

2 follow-up statements

093 
WWUS52 KILM 102151
SVSILM

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
551 PM EDT TUE MAY 10 2011

SCC051-102230-
/O.CON.KILM.TO.W.0023.000000T0000Z-110510T2230Z/
HORRY SC-
551 PM EDT TUE MAY 10 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
SOUTHEASTERN HORRY COUNTY...

AT 546 PM EDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM WITH STRONG ROTATION. THIS DEVELOPING TORNADO 
WAS CROSSING HIGHWAY 90 NEAR HAND...OR 9 MILES WEST OF NORTH MYRTLE 
BEACH...MOVING SOUTH AT 25 MPH. 

THE CORE OF THE THUNDERSTORM IS MOVING INTO BRIARCLIFFE ACRES...AND 
IS CAPABLE OF PRODUCING GOLFBALL SIZE HAIL AS IT CONTINUES SOUTH 
TOWARD MYRTLE BEACH. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BRIARCLIFFE
ACRES...FORESTBROOK...MYRTLE BEACH AND SOCASTEE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE DEVELOPING TORNADO...THIS STORM IS CAPABLE OF 
PRODUCING GOLFBALL SIZE HAIL...AND CLOUD TO GROUND LIGHTNING IS 
OCCURRING SEVERAL MILES SOUTH AND WEST OF THE RAIN AND HAIL. 

&&

PLEASE REPORT HAIL...DOWNED TREES OR DAMAGING WINDS TO THE NATIONAL
WEATHER SERVICE IN WILMINGTON NC...TOLL FREE AT 877-633-6772...WHEN
YOU CAN DO SO SAFELY.

LAT...LON 3372 7905 3401 7881 3384 7858 3383 7859
      3384 7860 3377 7875 3373 7882 3362 7896
TIME...MOT...LOC 2147Z 010DEG 21KT 3382 7882

$$

RAS

058 
WWUS52 KILM 102209
SVSILM

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
609 PM EDT TUE MAY 10 2011

SCC051-102218-
/O.CAN.KILM.TO.W.0023.000000T0000Z-110510T2230Z/
HORRY SC-
609 PM EDT TUE MAY 10 2011

...THE TORNADO WARNING FOR SOUTHEASTERN HORRY COUNTY IS CANCELED...

AT 605 PM EDT...THE STORM WHICH PROMPTED THE TORNADO WARNING HAS 
WEAKENED AND MOVED OFF THE COAST...THEREFORE THE TORNADO WARNING HAS 
BEEN CANCELED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
TUESDAY EVENING FOR SOUTHEAST NORTH CAROLINA AND NORTHEAST SOUTH
CAROLINA.

PLEASE REPORT HAIL...DOWNED TREES OR DAMAGING WINDS TO THE NATIONAL
WEATHER SERVICE IN WILMINGTON NC...TOLL FREE AT 877-633-6772...WHEN
YOU CAN DO SO SAFELY.

LAT...LON 3372 7905 3401 7881 3384 7858 3383 7859
      3384 7860 3377 7875 3373 7882 3362 7896
TIME...MOT...LOC 2208Z 010DEG 21KT 3370 7885

$$

RAS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 4:33 PM EDT	Severe Thunderstorm Warning	ILM	Horry	42 min
May 10, 5:15 PM EDT	Severe Thunderstorm Warning	ILM	Horry	30 min
May 10, 5:18 PM EDT	Special Marine Warning	ILM		57 min
May 10, 5:27 PM EDT	Severe Thunderstorm Warning	ILM	Florence, Marion	63 min
May 10, 5:48 PM EDT	Special Marine Warning	ILM		57 min
May 10, 6:13 PM EDT	Severe Thunderstorm Warning	ILM	Horry, Marion	77 min
May 10, 6:19 PM EDT	Severe Thunderstorm Warning	ILM	Florence, Georgetown, Williamsburg	56 min
May 10, 6:31 PM EDT	Special Marine Warning	ILM		59 min
May 10, 6:40 PM EDT	Severe Thunderstorm Warning	ILM	Dillon, Horry, Marion	50 min
May 10, 7:12 PM EDT	Severe Thunderstorm Warning	ILM	Georgetown, Williamsburg	63 min
May 10, 7:16 PM EDT	Severe Thunderstorm Warning	ILM	Florence, Georgetown, Williamsburg	31 min
May 10, 7:24 PM EDT	Special Marine Warning	ILM		66 min
May 10, 7:24 PM EDT	Tornado Warning	ILM	Georgetown, Williamsburg	51 min

Nearby

Tornado Warnings in South Carolina, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.