Alert archive / North Carolina / Mesoscale Discussions in 2018
Mesoscale Discussion 272
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2018, 5:45 PM EDT for 30 counties in North Carolina; 20 counties in South Carolina; 28 counties in Virginia. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2018, 5:45 PM EDT (21:45 UTC)
- Expired
- Apr 15, 2018, 7:15 PM EDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 78 counties
Alamance County, NC, Anson County, NC, Cabarrus County, NC, Caswell County, NC, Chatham County, NC, Cumberland County, NC, Davidson County, NC, Davie County, NC, Durham County, NC, Forsyth County, NC, Granville County, NC, Guilford County, NC, Harnett County, NC, Hoke County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Rockingham County, NC, Rowan County, NC, Scotland County, NC, Stanly County, NC, Stokes County, NC, Union County, NC, Vance County, NC, Wake County, NC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Sumter County, SC, Williamsburg County, SC, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Covington, VA, City of Danville, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Roanoke, VA, City of Salem, VA, Floyd County, VA, Franklin County, VA, Halifax County, VA, Henry County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nelson County, VA, Patrick County, VA, Pittsylvania County, VA, Prince Edward County, VA, Roanoke County, VA, Rockbridge County, VA
The radar
The Raleigh/Durham radar (KRAX), 113 km from the middle of the area, began a volume at 21:46 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, 9.8 hours before the alert went out and 50 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.
- Mixed-layer CAPE
- 28 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 638 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 11:15 AM EDT | Mesoscale Discussion | SPC | Alexander, Anson, Cabarrus, Catawba, Davidson, Davie and 11 more | 2 hr |
| Apr 15, 12:13 PM EDT | Tornado Watch | SPC | Alexander, Alleghany, Ashe, Burke, Cabarrus, Caldwell and 16 more | 9 hr |
| Apr 15, 2:29 PM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Caswell, Chatham, Cumberland, Davidson and 20 more | 91 min |
| Apr 15, 3:02 PM EDT | Tornado Watch | SPC | Alamance, Anson, Bladen, Brunswick, Caswell, Chatham and 34 more | 8 hr |
| Apr 15, 3:17 PM EDT | Mesoscale Discussion | SPC | Anson, Cabarrus, Davidson, Davie, Forsyth, Rowan and 3 more | 88 min |
| Apr 15, 6:28 PM EDT | Mesoscale Discussion | SPC | Cumberland, Franklin, Granville, Halifax, Johnston, Nash and 4 more | 62 min |
| Apr 15, 6:14 PM EDT | Tornado Watch | SPC | Amelia, Brunswick, Chesterfield, Cumberland, Dinwiddie, Fluvanna and 8 more | 7 hr |
Nearby
Mesoscale Discussions in North Carolina, 2018Mesoscale Discussions in Virginia, 2018Mesoscale Discussions in South Carolina, 2018Every mesoscale discussion in 2018
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.