Alert archive / North Carolina / Mesoscale Discussions in 2019

Mesoscale Discussion 405

April 19, 201929 counties in North Carolina; 6 counties in South Carolina; 24 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2019, 1:40 PM EDT for 29 counties in North Carolina; 6 counties in South Carolina; 24 counties in Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 19, 2019, 1:40 PM EDT (17:40 UTC)
Expired: Apr 19, 2019, 3:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 59 counties

Alamance County, NC, Alexander County, NC, Alleghany County, NC, Anson County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Caswell County, NC, Catawba County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Gaston County, NC, Guilford County, NC, Iredell County, NC, Lincoln County, NC, Mecklenburg County, NC, Montgomery County, NC, Randolph County, NC, Rockingham County, NC, Rowan County, NC, Rutherford County, NC, Stanly County, NC, Stokes County, NC, Surry County, NC, Union County, NC, Wilkes County, NC, Yadkin County, NC, Cherokee County, SC, Chester County, SC, Lancaster County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, City of Danville, VA, City of Galax, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA

The radar

The Roanoke radar (KFCX), 149 km from the middle of the area, began a volume at 17:43 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 5.7 hours before the alert went out and 91 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: 407 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 641 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 250 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 19, 10:06 AM EDT	Mesoscale Discussion	SPC	Alexander, Burke, Cabarrus, Caldwell, Caswell, Catawba and 19 more	84 min
Apr 19, 10:31 AM EDT	Tornado Watch	SPC	Alamance, Alexander, Alleghany, Anson, Ashe, Avery and 40 more	9 hr
Apr 19, 10:54 AM EDT	Mesoscale Discussion	SPC	Bladen, Brunswick, Columbus, Cumberland, Duplin, Greene and 9 more	96 min
Apr 19, 12:29 PM EDT	Mesoscale Discussion	SPC	Bertie, Bladen, Brunswick, Chowan, Columbus, Craven and 27 more	2 hr
Apr 19, 1:17 PM EDT	Tornado Watch	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 35 more	11 hr
Apr 19, 3:18 PM EDT	Mesoscale Discussion	SPC	Bertie, Bladen, Brunswick, Chatham, Columbus, Cumberland and 33 more	87 min
Apr 19, 4:35 PM EDT	Mesoscale Discussion	SPC	Alamance, Caswell, Chatham, Cumberland, Durham, Edgecombe and 17 more	55 min
Apr 19, 6:21 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Chowan, Craven, Gates, Halifax and 7 more	84 min
Apr 19, 10:44 AM EDT	Tornado Watch	SPC	Aiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 20 more	5 hr
Apr 19, 1:19 PM EDT	Mesoscale Discussion	SPC	Abbeville, Aiken, Allendale, Bamberg, Barnwell, Beaufort and 20 more	86 min
Apr 19, 12:08 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amelia, Arlington, Augusta, Buckingham, Clarke and 33 more	2 hr
Apr 19, 12:48 PM EDT	Tornado Watch	SPC	Albemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 28 more	9 hr
Apr 19, 4:32 PM EDT	Mesoscale Discussion	SPC	Albemarle, Arlington, Augusta, Caroline, Clarke, Culpeper and 35 more	58 min

Nearby

Mesoscale Discussions in North Carolina, 2019 Mesoscale Discussions in Virginia, 2019 Mesoscale Discussions in South Carolina, 2019 Every mesoscale discussion in 2019

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.