Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 1345

June 21, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2011, 5:03 PM CDT for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2011, 5:03 PM CDT (22:03 UTC)
Expired: Jun 21, 2011, 6:00 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

All 45 counties

Cherokee County, AL, DeKalb County, AL, Jackson County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Polk County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Graham County, NC, Macon County, NC, Swain County, NC, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Franklin County, TN, Grundy County, TN, Hamilton County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Sevier County, TN, Van Buren County, TN

The radar

The Northeast Alabama radar (KHTX), 117 km from the middle of the area, began a volume at 22:04 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, 10.1 hours before the alert went out and 180 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: 1450 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1187 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: -64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jun 21, 1:11 PM CDT	Mesoscale Discussion	SPC	Habersham, Rabun, Stephens	64 min

Nearby

Mesoscale Discussions in Georgia, 2011 Mesoscale Discussions in Tennessee, 2011 Mesoscale Discussions in North Carolina, 2011 Every mesoscale discussion in 2011

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.