Alert archive / North Carolina / Mesoscale Discussions in 2018

Mesoscale Discussion 1457

September 15, 201815 counties in North Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 15, 2018, 12:01 PM EDT for 15 counties in North Carolina. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Sep 15, 2018, 12:01 PM EDT (16:01 UTC)
Expired: Sep 15, 2018, 2:00 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center

Counties Bladen County, NC, Brunswick County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Harnett County, NC, Jones County, NC, Lenoir County, NC, New Hanover County, NC, Onslow County, NC, Pender County, NC, Robeson County, NC, Sampson County, NC, Wayne County, NC

The nearest sounding before it

Newport, NC (KMHX), launched 12:00Z, 4.0 hours before the alert went out and 99 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: 711 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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
Sep 14, 8:01 PM EDT	Mesoscale Discussion	SPC	Beaufort, Carteret, Craven, Cumberland, Dare, Duplin and 18 more	119 min
Sep 14, 10:25 PM EDT	Mesoscale Discussion	SPC	Bladen, Brunswick, Carteret, Columbus, Craven, Cumberland and 11 more	95 min
Sep 14, 11:03 PM EDT	Tornado Watch	SPC	Bladen, Brunswick, Carteret, Columbus, Craven, Cumberland and 12 more	8 hr
Sep 15, 2:59 AM EDT	Mesoscale Discussion	SPC	Bladen, Brunswick, Carteret, Columbus, Craven, Cumberland and 12 more	91 min
Sep 15, 6:15 AM EDT	Mesoscale Discussion	SPC	Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 16 more	90 min
Sep 15, 6:59 AM EDT	Tornado Watch	SPC	Bladen, Brunswick, Columbus, Cumberland, Duplin, Greene and 14 more	10 hr
Sep 15, 3:26 PM EDT	Mesoscale Discussion	SPC	Pender	64 min
Sep 15, 4:38 PM EDT	Tornado Watch	SPC	Bladen, Brunswick, Columbus, Cumberland, Hoke, New Hanover and 4 more	6 hr

Nearby

Mesoscale Discussions in North Carolina, 2018 Every 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.