Alert archive / South Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 799

May 17, 20114 counties in North Carolina; 23 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 17, 2011, 6:51 PM EDT for 4 counties in North Carolina; 23 counties in South Carolina. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: May 17, 2011, 6:51 PM EDT (22:51 UTC)
Expired: May 17, 2011, 8:45 PM EDT
In force: 114 min
Issued by: the Storm Prediction Center

All 27 counties

Bladen County, NC, Columbus County, NC, Robeson County, NC, Scotland County, NC, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Calhoun County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Edgefield County, SC, Florence County, SC, Greenwood County, SC, Horry County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Williamsburg County, SC

The radar

The Columbia radar (KCAE), 64 km from the middle of the area, began a volume at 22:53 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, 10.9 hours before the alert went out and 152 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 542 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 11:14 AM EDT	Mesoscale Discussion	SPC	Bertie, Camden, Caswell, Chowan, Currituck, Franklin and 16 more	2 hr

Nearby

Mesoscale Discussions in South Carolina, 2011 Mesoscale Discussions in North Carolina, 2011 Every mesoscale discussion 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.