Alert archive / North Carolina / Mesoscale Discussions in 2020

Mesoscale Discussion 377

April 13, 202057 counties in North Carolina; 4 counties in South Carolina; 48 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2020, 4:40 AM EDT for 57 counties in North Carolina; 4 counties in South Carolina; 48 counties in Virginia. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2020, 4:40 AM EDT (08:40 UTC)
Expired: Apr 13, 2020, 6:15 AM EDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 109 counties

Alamance County, NC, Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Camden County, NC, Carteret County, NC, Caswell County, NC, Chatham County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Currituck County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Hyde County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, New Hanover County, NC, Northampton County, NC, Onslow County, NC, Orange County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Person County, NC, Pitt County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Dillon County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Amelia County, VA, Brunswick County, VA, Buckingham County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Danville, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Richmond, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Gloucester County, VA, Goochland County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King William County, VA, Lunenburg County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA

The radar

The Raleigh/Durham radar (KRAX), 36 km from the middle of the area, began a volume at 08:40 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.

Tornado Watch 118Apr 13, 5:00 AM EDT

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 8.7 hours before the alert went out and 153 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: 3 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 712 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 299 m²/s²
0-3 km storm-relative helicity: 489 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 12, 8:41 PM EDT	Mesoscale Discussion	SPC	Cherokee, Clay, Graham, Jackson, Macon, Transylvania	64 min
Apr 12, 8:57 PM EDT	Tornado Watch	SPC	Cherokee, Clay, Graham, Haywood, Jackson, Macon and 2 more	6 hr
Apr 12, 11:17 PM EDT	Mesoscale Discussion	SPC	Alexander, Anson, Avery, Buncombe, Burke, Cabarrus and 31 more	88 min
Apr 13, 1:51 AM EDT	Tornado Watch	SPC	Alexander, Burke, Cabarrus, Caldwell, Catawba, Cleveland and 14 more	6 hr
Apr 13, 2:39 AM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Cabarrus, Chatham, Cumberland, Davidson and 21 more	96 min
Apr 13, 5:01 AM EDT	Tornado Watch	SPC	Alamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 53 more	7 hr
Apr 13, 6:46 AM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Chowan, Columbus, Craven and 32 more	89 min
Apr 13, 9:56 AM EDT	Mesoscale Discussion	SPC	Carteret, Dare, Hyde, Pamlico, Tyrrell, Washington	64 min
Apr 13, 3:20 AM EDT	Tornado Watch	SPC	Aiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 20 more	8 hr
Apr 13, 6:17 AM EDT	Mesoscale Discussion	SPC	Beaufort, Berkeley, Charleston, Clarendon, Colleton, Darlington and 8 more	88 min
Apr 13, 10:34 AM EDT	Mesoscale Discussion	SPC	Albemarle, Arlington, Caroline, Clarke, Culpeper, Essex and 28 more	86 min
Apr 13, 11:33 AM EDT	Tornado Watch	SPC	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 15 more	5 hr
Apr 13, 1:20 PM EDT	Mesoscale Discussion	SPC	Arlington, Clarke, Fairfax, Fauquier, King George, Loudoun and 7 more	85 min

Nearby

Mesoscale Discussions in North Carolina, 2020 Mesoscale Discussions in Virginia, 2020 Mesoscale Discussions in South Carolina, 2020 Every mesoscale discussion in 2020

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.