Alert archive / North Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 590

April 26, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2012, 8:47 AM EDT for 5 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2012, 8:47 AM EDT (12:47 UTC)
Expired: Apr 26, 2012, 10:15 AM EDT
In force: 88 min
Issued by: the Storm Prediction Center

All 89 counties

Banks County, GA, Dawson County, GA, Elbert County, GA, Fannin County, GA, Franklin County, GA, Gilmer County, GA, Gordon County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, White County, GA, Whitfield County, GA, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Stokes County, NC, Surry County, NC, Swain County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Blount County, TN, Bradley County, TN, Carter County, TN, Johnson County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN, Sullivan County, TN, Unicoi County, TN, Carroll County, VA, City of Bristol, VA, City of Galax, VA, City of Martinsville, VA, Grayson County, VA, Henry County, VA, Patrick County, VA, Smyth County, VA, Washington County, VA, Wythe County, VA

The radar

The Knoxville radar (KMRX), 79 km from the middle of the area, began a volume at 12:48 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, 0.8 hours before the alert went out and 255 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: 36 J/kg
Mixed-layer CIN: -279 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 266 m²/s²
0-3 km storm-relative helicity: 265 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
Apr 26, 8:10 AM EDT	Severe Thunderstorm Watch	SPC	Catoosa, Dade, Fannin, Gilmer, Habersham, Lumpkin and 8 more	3 hr
Apr 26, 7:09 PM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 27 more	96 min
Apr 26, 7:24 AM EDT	Mesoscale Discussion	SPC	Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 20 more	96 min
Apr 26, 4:22 PM EDT	Mesoscale Discussion	SPC	Buncombe, Graham, Haywood, Henderson, Jackson, Polk and 2 more	83 min
Apr 26, 5:07 AM EDT	Mesoscale Discussion	SPC	Anderson, Campbell, Claiborne, Clay, Cumberland, Davidson and 15 more	83 min
Apr 26, 6:22 AM EDT	Severe Thunderstorm Watch	SPC	Anderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 44 more	3 hr
Apr 26, 2:23 PM EDT	Mesoscale Discussion	SPC	Cheatham, Clay, Davidson, DeKalb, Dickson, Fentress and 17 more	2 hr
Apr 26, 3:11 PM EDT	Severe Thunderstorm Watch	SPC	Bedford, Campbell, Cannon, Cheatham, Claiborne, Clay and 30 more	6 hr
Apr 26, 5:52 PM EDT	Mesoscale Discussion	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dickson and 13 more	83 min
Apr 26, 6:40 PM EDT	Mesoscale Discussion	SPC	Anderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 58 more	95 min

Nearby

Mesoscale Discussions in North Carolina, 2012 Mesoscale Discussions in Georgia, 2012 Mesoscale Discussions in Tennessee, 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.