Alert archive / South Carolina / Mesoscale Discussions in 2018

Mesoscale Discussion 1563

October 10, 2018Anson County, Union County, North Carolina; 35 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Oct 10, 2018, 11:08 PM EDT for Anson County, Union County, North Carolina; 35 counties in South Carolina. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Oct 10, 2018, 11:08 PM EDT (03:08 UTC)
Expired: Oct 11, 2018, 12:45 AM EDT
In force: 97 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 37 counties

Anson County, NC, Union 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, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dorchester County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Greenwood County, SC, Hampton County, SC, Jasper County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC, York County, SC

The radar

The Columbia radar (KCAE), 52 km from the middle of the area, began a volume at 03:12 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 408Oct 10, 11:35 PM EDT

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 3.1 hours before the alert went out and 111 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: 846 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 11, 4:34 AM EDT	Mesoscale Discussion	SPC	Anson, Bladen, Brunswick, Cabarrus, Chatham, Columbus and 22 more	56 min
Oct 11, 8:31 AM EDT	Mesoscale Discussion	SPC	Alamance, Bladen, Caswell, Chatham, Cumberland, Duplin and 25 more	89 min
Oct 11, 9:58 AM EDT	Tornado Watch	SPC	Alamance, Beaufort, Bertie, Bladen, Brunswick, Camden and 49 more	13 hr
Oct 11, 12:48 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 28 more	117 min
Oct 11, 3:54 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Caswell, Chowan, Currituck and 18 more	2 hr
Oct 10, 11:38 PM EDT	Tornado Watch	SPC	Abbeville, Aiken, Allendale, Bamberg, Barnwell, Beaufort and 36 more	7 hr

Nearby

Mesoscale Discussions in South Carolina, 2018 Mesoscale Discussions in North Carolina, 2018 Every mesoscale discussion in 2018

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.