Alert archive / South Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 1411

July 5, 20124 counties in North Carolina; 14 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2012, 6:41 PM EDT for 4 counties in North Carolina; 14 counties in South Carolina. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 5, 2012, 6:41 PM EDT (22:41 UTC)
Expired: Jul 5, 2012, 8:15 PM EDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Bladen County, NC, Columbus County, NC, Robeson County, NC, Scotland County, NC, Calhoun County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Florence County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 128 km from the middle of the area, began a volume at 22:43 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, 10.7 hours before the alert went out and 153 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: 1961 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 44 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
Jul 5, 11:14 AM EDT	Mesoscale Discussion	SPC	Alleghany, Ashe, Avery, Watauga	91 min
Jul 5, 11:37 AM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Ashe, Stokes, Surry, Watauga, Wilkes and 1 more	7 hr
Jul 5, 1:11 PM EDT	Mesoscale Discussion	SPC	Buncombe, Cherokee, Clay, Graham, Haywood, Henderson and 9 more	94 min
Jul 5, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 22 more	8 hr
Jul 5, 1:40 PM EDT	Mesoscale Discussion	SPC	Anson, Beaufort, Bertie, Bladen, Brunswick, Chowan and 34 more	95 min
Jul 5, 2:57 PM EDT	Mesoscale Discussion	SPC	Alexander, Alleghany, Ashe, Avery, Caldwell, Mitchell and 5 more	2 hr
Jul 5, 3:19 PM EDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay	6 hr

Nearby

Mesoscale Discussions in South Carolina, 2012 Mesoscale Discussions in North Carolina, 2012 Every mesoscale discussion in 2012

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.