Alert archive / North Carolina / Mesoscale Discussions in 2014

Mesoscale Discussion 1495

July 28, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jul 28, 2014, 12:32 AM EDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jul 28, 2014, 12:32 AM EDT (04:32 UTC)
Expired: Jul 28, 2014, 2:00 AM EDT
In force: 88 min
Issued by: the Storm Prediction Center

All 54 counties

Banks County, GA, Dawson County, GA, Elbert County, GA, Fannin County, GA, Forsyth County, GA, Franklin County, GA, Gilmer County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, White County, GA, Cabarrus County, NC, Catawba County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Mecklenburg County, NC, Polk County, NC, Randolph County, NC, Rowan County, NC, Rutherford County, NC, Stanly County, NC, Swain County, NC, Transylvania County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Laurens County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Bradley County, TN, Monroe County, TN, Polk County, TN

The radar

The Greer radar (KGSP), 50 km from the middle of the area, began a volume at 04:36 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 4.5 hours before the alert went out and 256 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: 1368 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1274 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 339 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 8.7

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
Jul 28, 2:27 PM EDT	Mesoscale Discussion	SPC	Baldwin, Ben Hill, Bibb, Bleckley, Bryan, Bulloch and 52 more	93 min
Jul 28, 3:25 PM EDT	Severe Thunderstorm Watch	SPC	Appling, Bacon, Baker, Ben Hill, Berrien, Bleckley and 57 more	6 hr
Jul 28, 7:36 PM EDT	Mesoscale Discussion	SPC	Bulloch, Candler, Dodge, Dooly, Effingham, Evans and 9 more	84 min
Jul 27, 8:00 PM EDT	Tornado Watch	SPC	Cherokee, Clay	5 hr
Jul 27, 11:28 PM EDT	Mesoscale Discussion	SPC	Alamance, Caswell, Durham, Forsyth, Franklin, Granville and 7 more	2 hr

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.