Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 828

June 5, 20145 counties in Alabama; 7 counties in Georgia; 14 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2014, 2:14 AM CDT for 5 counties in Alabama; 7 counties in Georgia; 14 counties in Tennessee. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jun 5, 2014, 2:14 AM CDT (07:14 UTC)
Expired: Jun 5, 2014, 3:45 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 26 counties

DeKalb County, AL, Jackson County, AL, Lauderdale County, AL, Limestone County, AL, Madison County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Gilmer County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Bedford County, TN, Coffee County, TN, Decatur County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Moore County, TN, Perry County, TN, Wayne County, TN

The radar

The Northeast Alabama radar (KHTX), 78 km from the middle of the area, began a volume at 07:15 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

Nashville Metro, TN (KBNA), launched 00:00Z, 7.2 hours before the alert went out and 91 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: 1296 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1296 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.6

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 4, 11:53 PM CDT	Mesoscale Discussion	SPC	Limestone	97 min
Jun 5, 1:22 PM CDT	Mesoscale Discussion	SPC	Marion	53 min
Jun 5, 2:27 PM CDT	Severe Thunderstorm Watch	SPC	Blount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 19 more	6 hr
Jun 5, 5:10 PM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 5 more	95 min
Jun 5, 6:44 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Banks, Barrow, Bibb, Bleckley, Butts and 54 more	3 hr
Jun 4, 7:00 PM CDT	Tornado Watch	SPC	Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 17 more	6 hr
Jun 4, 7:24 PM CDT	Tornado Watch	SPC	Benton, Cannon, Carroll, Cheatham, Clay, Cumberland and 28 more	8 hr
Jun 4, 9:45 PM CDT	Mesoscale Discussion	SPC	Blount, Carter, Cocke, Grainger, Greene, Hamblen and 10 more	2 hr
Jun 5, 9:27 AM CDT	Mesoscale Discussion	SPC	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	63 min
Jun 5, 10:06 AM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	7 hr

Nearby

Mesoscale Discussions in Tennessee, 2014 Mesoscale Discussions in Georgia, 2014 Mesoscale Discussions in Alabama, 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.