Alert archive / Georgia / Mesoscale Discussions in 2015

Mesoscale Discussion 1085

June 20, 201515 counties in Georgia; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2015, 3:22 PM EDT for 15 counties in Georgia; 13 counties in South Carolina. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2015, 3:22 PM EDT (19:22 UTC)
Expired: Jun 20, 2015, 5:15 PM EDT
In force: 113 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 28 counties

Baldwin County, GA, Columbia County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Jefferson County, GA, Jones County, GA, Lincoln County, GA, McDuffie County, GA, Monroe County, GA, Richmond County, GA, Taliaferro County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Abbeville County, SC, Aiken County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Richland County, SC, Saluda County, SC

The radar

The Greer radar (KGSP), 130 km from the middle of the area, began a volume at 19:21 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.4 hours before the alert went out and 187 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: 987 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 705 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Jun 20, 1:36 PM EDT	Mesoscale Discussion	SPC	Cherokee, Chester, Greenville, Laurens, Newberry, Pickens and 3 more	114 min

Nearby

Mesoscale Discussions in Georgia, 2015 Mesoscale Discussions in South Carolina, 2015 Every mesoscale discussion in 2015

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.