Alert archive / North Carolina / Mesoscale Discussions in 2020

Mesoscale Discussion 50

January 12, 202016 counties in North Carolina; Horry County, Marion County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2020, 1:49 AM EST for 16 counties in North Carolina; Horry County, Marion County, South Carolina. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jan 12, 2020, 1:49 AM EST (06:49 UTC)
Expired: Jan 12, 2020, 3:15 AM EST
In force: 86 min
Issued by: the Storm Prediction Center

Counties Beaufort County, NC, Bladen County, NC, Brunswick County, NC, Columbus County, NC, Craven County, NC, Duplin County, NC, Jones County, NC, Lenoir County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Pitt County, NC, Sampson County, NC, Tyrrell County, NC, Washington County, NC, Horry County, SC, Marion County, SC

The radar

The Morehead City radar (KMHX), 89 km from the middle of the area, began a volume at 06:51 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, 6.8 hours before the alert went out and 89 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: 19 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 236 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
Jan 11, 7:37 PM EST	Severe Thunderstorm Watch	SPC	Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more	5 hr
Jan 11, 8:40 PM EST	Mesoscale Discussion	SPC	Alexander, Burke, Cabarrus, Caldwell, Catawba, Cleveland and 14 more	95 min
Jan 11, 9:35 PM EST	Severe Thunderstorm Watch	SPC	Alamance, Anson, Bladen, Chatham, Cumberland, Davidson and 19 more	4 hr
Jan 11, 10:59 PM EST	Mesoscale Discussion	SPC	Alamance, Anson, Caswell, Chatham, Cumberland, Davidson and 22 more	91 min
Jan 11, 11:25 PM EST	Severe Thunderstorm Watch	SPC	Bertie, Camden, Chowan, Edgecombe, Gates, Greene and 13 more	4 hr

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.