Alert archive / North Carolina / Mesoscale Discussions in 2013

Mesoscale Discussion 532

April 19, 201335 counties in North Carolina; 22 counties in South Carolina; Henry County, City of Danville, Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2013, 12:35 PM EDT for 35 counties in North Carolina; 22 counties in South Carolina; Henry County, City of Danville, Virginia. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2013, 12:35 PM EDT (16:35 UTC)
Expired: Apr 19, 2013, 2:30 PM EDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 59 counties

Alamance County, NC, Alexander County, NC, Anson County, NC, Burke County, NC, Cabarrus County, NC, Caswell County, NC, Catawba County, NC, Chatham County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Durham County, NC, Forsyth County, NC, Gaston County, NC, Guilford County, NC, Hoke County, NC, Iredell County, NC, Lee County, NC, Lincoln County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Rockingham County, NC, Rowan County, NC, Rutherford County, NC, Scotland County, NC, Stanly County, NC, Stokes County, NC, Union County, NC, Wake County, NC, Yadkin County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Chesterfield County, SC, Darlington County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marlboro County, SC, Newberry County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC, City of Danville, VA, Henry County, VA

The radar

The Columbia radar (KCAE), 122 km from the middle of the area, began a volume at 16:35 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.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 4.6 hours before the alert went out and 140 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: 58 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 567 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 223 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 19, 2:00 PM EDT	Tornado Watch	SPC	Alamance, Alexander, Anson, Cabarrus, Catawba, Chatham and 31 more	7 hr
Apr 19, 2:31 PM EDT	Tornado Watch	SPC	Caswell, Rockingham, Stokes, Surry, Yadkin	7 hr
Apr 19, 4:48 PM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 58 more	57 min
Apr 19, 6:27 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 29 more	4 hr
Apr 19, 6:54 PM EDT	Mesoscale Discussion	SPC	Bladen, Cumberland, Edgecombe, Franklin, Greene, Halifax and 11 more	66 min
Apr 19, 12:37 PM EDT	Severe Thunderstorm Watch	SPC	Aiken, Bamberg, Barnwell, Calhoun, Clarendon, Edgefield and 6 more	6 hr
Apr 19, 1:57 PM EDT	Mesoscale Discussion	SPC	Aiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 12 more	2 hr
Apr 19, 2:36 PM EDT	Severe Thunderstorm Watch	SPC	Allendale, Beaufort, Berkeley, Charleston, Colleton, Dorchester and 2 more	7 hr
Apr 19, 4:29 PM EDT	Mesoscale Discussion	SPC	Aiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 9 more	2 hr
Apr 19, 6:37 PM EDT	Mesoscale Discussion	SPC	Beaufort, Berkeley, Charleston, Clarendon, Colleton, Dorchester	113 min
Apr 19, 1:27 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amelia, Amherst, Appomattox, Arlington, Augusta and 80 more	63 min
Apr 19, 4:36 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amelia, Amherst, Appomattox, Arlington, Augusta and 66 more	114 min

Nearby

Mesoscale Discussions in North Carolina, 2013 Mesoscale Discussions in South Carolina, 2013 Mesoscale Discussions in Virginia, 2013 Every mesoscale discussion in 2013

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.