Alert archive / South Carolina / Mesoscale Discussions in 2007

Mesoscale Discussion 1861

August 23, 2007Columbus County, Robeson County, North Carolina; 19 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2007, 2:52 PM EDT for Columbus County, Robeson County, North Carolina; 19 counties in South Carolina. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2007, 2:52 PM EDT (18:52 UTC)
Expired: Aug 23, 2007, 4:45 PM EDT
In force: 113 min
Issued by: the Storm Prediction Center

All 21 counties

Columbus County, NC, Robeson County, NC, Bamberg 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, Florence County, SC, Georgetown County, SC, Horry County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Orangeburg 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 18:53 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.9 hours before the alert went out and 280 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: 1564 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 581 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 35 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
Aug 23, 2:16 PM EDT	Mesoscale Discussion	SPC	Ashe, Avery, Buncombe, Burke, Caldwell, Cherokee and 15 more	2 hr

Nearby

Mesoscale Discussions in South Carolina, 2007 Mesoscale Discussions in North Carolina, 2007 Every mesoscale discussion in 2007

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.