Alert archive / South Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 990

May 26, 2011Columbia County, Lincoln County, McDuffie County, Georgia; 17 counties in North Carolina; 18 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 26, 2011, 7:12 PM EDT for Columbia County, Lincoln County, McDuffie County, Georgia; 17 counties in North Carolina; 18 counties in South Carolina. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: May 26, 2011, 7:12 PM EDT (23:12 UTC)
Expired: May 26, 2011, 8:45 PM EDT
In force: 93 min
Issued by: the Storm Prediction Center

All 38 counties

Columbia County, GA, Lincoln County, GA, McDuffie County, GA, Alexander County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Gaston County, NC, Iredell County, NC, Lincoln County, NC, Mecklenburg County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Union County, NC, Wilkes County, NC, Yadkin County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 59 km from the middle of the area, began a volume at 23:15 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, 11.2 hours before the alert went out and 216 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: 149 J/kg
Mixed-layer CIN: -412 J/kg
Mixed-layer LCL: 1701 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -99 m²/s²
0-3 km storm-relative helicity: -89 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 26, 8:56 AM EDT	Mesoscale Discussion	SPC	Catoosa, Chattooga, Dade, Floyd, Gordon, Murray and 2 more	94 min
May 26, 10:15 AM EDT	Severe Thunderstorm Watch	SPC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 20 more	9 hr
May 26, 11:39 AM EDT	Mesoscale Discussion	SPC	Clay, Decatur, Early, Miller, Quitman, Seminole	96 min
May 26, 1:22 PM EDT	Mesoscale Discussion	SPC	Bartow, Catoosa, Chattooga, Dade, Fannin, Floyd and 7 more	83 min
May 26, 3:32 PM EDT	Mesoscale Discussion	SPC	Bartow, Cherokee, Cobb, Dawson, Fannin, Floyd and 16 more	58 min
May 26, 3:44 PM EDT	Severe Thunderstorm Watch	SPC	Baldwin, Banks, Barrow, Bibb, Butts, Calhoun and 59 more	6 hr
May 26, 4:36 PM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Bibb, Butts, Calhoun and 74 more	84 min
May 26, 5:10 PM EDT	Severe Thunderstorm Watch	SPC	Elbert, Franklin, Habersham, Hart, Rabun, Stephens	7 hr
May 26, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Ashe, Surry, Watauga, Wilkes, Yadkin	11 hr

Nearby

Mesoscale Discussions in South Carolina, 2011 Mesoscale Discussions in North Carolina, 2011 Mesoscale Discussions in Georgia, 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.