Alert archive / North Carolina / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 542

June 23, 201115 counties in Georgia; 36 counties in North Carolina; 31 counties in South Carolina

The Storm Prediction Center issued this severe thunderstorm watch at Jun 23, 2011, 2:36 PM EDT for 15 counties in Georgia; 36 counties in North Carolina; 31 counties in South Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 23, 2011, 2:36 PM EDT (18:36 UTC)
Expired: Jun 23, 2011, 8:58 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 82 counties

Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Chatham County, GA, Columbia County, GA, Effingham County, GA, Evans County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Anson County, NC, Beaufort County, NC, Bladen County, NC, Brunswick County, NC, Carteret County, NC, Chatham County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Edgecombe County, NC, Franklin County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Pitt County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Wake County, NC, Wayne County, NC, Wilson County, NC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC

The radar

The Columbia radar (KCAE), 98 km from the middle of the area, began a volume at 18:39 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

37 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 23, 2:39 PM EDT	Severe Thunderstorm Warning	CAE	Edgefield, Lexington, Saluda	51 min
Jun 23, 2:55 PM EDT	Severe Thunderstorm Warning	CAE	Kershaw, Lee, Richland, Sumter	65 min
Jun 23, 3:20 PM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Harnett	27 min
Jun 23, 3:33 PM EDT	Severe Thunderstorm Warning	ILM	Darlington, Florence	57 min
Jun 23, 4:01 PM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Hoke, Scotland	59 min
Jun 23, 4:04 PM EDT	Severe Thunderstorm Warning	ILM	Robeson	56 min
Jun 23, 4:11 PM EDT	Severe Thunderstorm Warning	ILM	New Hanover, Pender	64 min
Jun 23, 4:13 PM EDT	Severe Thunderstorm Warning	RAH	Johnston, Sampson, Wayne, Wilson	62 min
Jun 23, 4:23 PM EDT	Severe Thunderstorm Warning	ILM	Georgetown	67 min
Jun 23, 4:46 PM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Sampson, Wayne	74 min
Jun 23, 4:47 PM EDT	Severe Thunderstorm Warning	CHS	Chatham	58 min
Jun 23, 4:52 PM EDT	Severe Thunderstorm Warning	ILM	Bladen, Robeson	55 min
Jun 23, 4:56 PM EDT	Severe Thunderstorm Warning	CHS	Bulloch, Candler, Tattnall	64 min
Jun 23, 4:58 PM EDT	Severe Thunderstorm Warning	MHX	Greene, Pitt	62 min
Jun 23, 4:59 PM EDT	Severe Thunderstorm Warning	ILM	Horry, Marion	46 min
Jun 23, 5:03 PM EDT	Severe Thunderstorm Warning	ILM	Williamsburg	42 min
Jun 23, 5:11 PM EDT	Severe Thunderstorm Warning	RAH	Edgecombe, Wilson	46 min
Jun 23, 5:20 PM EDT	Severe Thunderstorm Warning	ILM	Georgetown, Horry	55 min
Jun 23, 5:27 PM EDT	Severe Thunderstorm Warning	MHX	Beaufort, Martin, Pitt	49 min
Jun 23, 5:29 PM EDT	Severe Thunderstorm Warning	ILM	Florence, Georgetown, Horry, Marion, Williamsburg	50 min
Jun 23, 5:35 PM EDT	Severe Thunderstorm Warning	ILM	Bladen, Brunswick, Columbus, New Hanover, Pender	55 min
Jun 23, 5:40 PM EDT	Severe Thunderstorm Warning	ILM	Horry	35 min
Jun 23, 5:42 PM EDT	Severe Thunderstorm Warning	CHS	Bulloch, Effingham	63 min
Jun 23, 5:49 PM EDT	Severe Thunderstorm Warning	MHX	Greene, Lenoir	38 min
Jun 23, 5:50 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley	40 min
Jun 23, 5:55 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Charleston, Colleton, Dorchester, Hampton, Jasper	65 min
Jun 23, 6:01 PM EDT	Severe Thunderstorm Warning	MHX	Beaufort, Martin, Washington	59 min
Jun 23, 6:13 PM EDT	Severe Thunderstorm Warning	ILM	Brunswick, Columbus	47 min
Jun 23, 6:29 PM EDT	Severe Thunderstorm Warning	ILM	Pender	34 min
Jun 23, 6:31 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Charleston, Colleton, Jasper	59 min
Jun 23, 6:47 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Charleston	45 min
Jun 23, 6:50 PM EDT	Severe Thunderstorm Warning	MHX	Onslow	55 min
Jun 23, 6:52 PM EDT	Severe Thunderstorm Warning	CHS	Liberty, McIntosh	28 min
Jun 23, 7:02 PM EDT	Severe Thunderstorm Warning	MHX	Beaufort, Craven, Hyde, Pamlico, Washington	58 min
Jun 23, 7:11 PM EDT	Severe Thunderstorm Warning	MHX	Craven, Jones, Onslow, Pamlico	49 min
Jun 23, 7:24 PM EDT	Severe Thunderstorm Warning	ILM	Bladen, Columbus, Pender	38 min
Jun 23, 7:28 PM EDT	Severe Thunderstorm Warning	MHX	Carteret, Craven, Jones, Onslow	47 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

Mesoscale Discussion 1366Jun 23, 1:40 PM EDT

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 6.6 hours before the alert went out and 143 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: 1114 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 994 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 23, 1:40 PM EDT	Mesoscale Discussion	SPC	Bleckley, Bulloch, Burke, Candler, Effingham, Emanuel and 8 more	3 hr

Nearby

Severe Thunderstorm Watches in North Carolina, 2011 Severe Thunderstorm Watches in South Carolina, 2011 Severe Thunderstorm Watches in Georgia, 2011 Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.