Alert archive / North Carolina / Mesoscale Discussions in 2014

Mesoscale Discussion 467

April 28, 20147 counties in Georgia; 8 counties in North Carolina; Oconee County, Pickens County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2014, 11:29 PM EDT for 7 counties in Georgia; 8 counties in North Carolina; Oconee County, Pickens County, South Carolina. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Apr 28, 2014, 11:29 PM EDT (03:29 UTC)
Expired: Apr 29, 2014, 12:30 AM EDT
In force: 61 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Banks County, GA, Habersham County, GA, Hall County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, White County, GA, Buncombe County, NC, Clay County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Transylvania County, NC, Oconee County, SC, Pickens County, SC

The radar

The Greer radar (KGSP), 94 km from the middle of the area, began a volume at 03:32 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 3.5 hours before the alert went out and 231 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: 1978 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 250 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 13.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 28, 8:12 PM EDT	Mesoscale Discussion	SPC	Dade	93 min
Apr 28, 8:59 PM EDT	Tornado Watch	SPC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Dade and 11 more	11 hr
Apr 28, 10:34 PM EDT	Mesoscale Discussion	SPC	Bartow, Catoosa, Chattooga, Dade, Fannin, Floyd and 8 more	86 min
Apr 29, 12:20 AM EDT	Mesoscale Discussion	SPC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 20 more	85 min
Apr 29, 12:30 AM EDT	Tornado Watch	SPC	Banks, Dawson, Forsyth, Franklin, Habersham, Hall and 7 more	7 hr
Apr 29, 2:38 AM EDT	Mesoscale Discussion	SPC	Barrow, Bibb, Butts, Calhoun, Carroll, Chattahoochee and 49 more	67 min
Apr 29, 2:56 AM EDT	Tornado Watch	SPC	Baker, Banks, Barrow, Bartow, Ben Hill, Bibb and 89 more	9 hr
Apr 29, 5:01 AM EDT	Mesoscale Discussion	SPC	Baker, Barrow, Bartow, Butts, Calhoun, Carroll and 49 more	89 min
Apr 29, 8:13 AM EDT	Mesoscale Discussion	SPC	Ben Hill, Bleckley, Brooks, Colquitt, Cook, Crisp and 13 more	92 min
Apr 29, 11:13 AM EDT	Mesoscale Discussion	SPC	Atkinson, Berrien, Brooks, Clinch, Colquitt, Cook and 5 more	62 min
Apr 29, 4:27 PM EDT	Mesoscale Discussion	SPC	Dade	33 min
Apr 29, 1:26 PM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Bladen, Cabarrus, Caswell, Catawba and 40 more	94 min
Apr 29, 2:27 PM EDT	Tornado Watch	SPC	Anson, Beaufort, Bertie, Carteret, Chatham, Chowan and 38 more	8 hr
Apr 29, 4:38 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Camden, Carteret, Chowan and 27 more	97 min
Apr 29, 7:22 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Carteret, Chowan, Craven, Cumberland and 26 more	53 min

Nearby

Mesoscale Discussions in North Carolina, 2014 Mesoscale Discussions in Georgia, 2014 Mesoscale Discussions in South Carolina, 2014 Every mesoscale discussion in 2014

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.