Alert archive / North Carolina / Mesoscale Discussions in 2020

Mesoscale Discussion 99

February 6, 202017 counties in North Carolina; 4 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Feb 6, 2020, 8:09 PM EST for 17 counties in North Carolina; 4 counties in South Carolina. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Feb 6, 2020, 8:09 PM EST (01:09 UTC)
Expired: Feb 6, 2020, 9:45 PM EST
In force: 96 min
Issued by: the Storm Prediction Center

All 21 counties

Beaufort County, NC, Bladen County, NC, Brunswick County, NC, Carteret County, NC, Columbus County, NC, Craven County, NC, Dare County, NC, Duplin County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Tyrrell County, NC, Washington County, NC, Georgetown County, SC, Horry County, SC, Marion County, SC, Williamsburg County, SC

The radar

The Morehead City radar (KMHX), 51 km from the middle of the area, began a volume at 01:10 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

Newport, NC (KMHX), launched 00:00Z, 1.2 hours before the alert went out and 51 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: 320 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 610 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 500 m²/s²
0-3 km storm-relative helicity: 508 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

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, 11:32 PM EST	Mesoscale Discussion	SPC	Brunswick, Carteret, New Hanover	118 min
Feb 6, 7:32 PM EST	Mesoscale Discussion	SPC	Beaufort, Charleston, Colleton, Dorchester, Hampton, Jasper	118 min

Nearby

Mesoscale Discussions in North Carolina, 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.