Alert archive / North Carolina / Mesoscale Discussions in 2020

Mesoscale Discussion 92

February 6, 202022 counties in North Carolina; 15 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Feb 6, 2020, 11:55 AM EST for 22 counties in North Carolina; 15 counties in Virginia. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Feb 6, 2020, 11:55 AM EST (16:55 UTC)
Expired: Feb 6, 2020, 1:00 PM EST
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 37 counties

Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Hertford County, NC, Johnston County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Greensville County, VA, Isle of Wight County, VA, Southampton County, VA, Sussex County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 76 km from the middle of the area, began a volume at 16:56 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 30Feb 6, 12:40 PM EST

The nearest sounding before it

Newport, NC (KMHX), launched 12:00Z, 4.9 hours before the alert went out and 179 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: 34 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 605 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 293 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
Feb 6, 9:50 AM EST	Mesoscale Discussion	SPC	Anson, Cabarrus, Catawba, Chatham, Cleveland, Davidson and 13 more	55 min
Feb 6, 10:12 AM EST	Tornado Watch	SPC	Alamance, Anson, Cabarrus, Catawba, Chatham, Cleveland and 20 more	7 hr
Feb 6, 11:01 AM EST	Tornado Watch	SPC	Caswell, Rockingham, Stokes, Surry, Yadkin	2 hr
Feb 6, 12:41 PM EST	Tornado Watch	SPC	Beaufort, Bertie, Camden, Chowan, Cumberland, Currituck and 28 more	6 hr
Feb 6, 1:08 PM EST	Mesoscale Discussion	SPC	Anson, Chatham, Hoke, Lee, Montgomery, Moore and 3 more	97 min
Feb 6, 4:00 PM EST	Mesoscale Discussion	SPC	Bladen, Brunswick, Carteret, Columbus, Craven, Duplin and 5 more	60 min
Feb 6, 4:23 PM EST	Tornado Watch	SPC	Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 15 more	9 hr

Nearby

Mesoscale Discussions in North Carolina, 2020 Mesoscale Discussions in Virginia, 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.