Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 1819

October 6, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Oct 6, 2014, 6:36 PM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Oct 6, 2014, 6:36 PM CDT (23:36 UTC)
Expired: Oct 6, 2014, 8:00 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 48 counties

Colbert County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Morgan County, AL, Dade County, GA, Alcorn County, MS, Itawamba County, MS, Lee County, MS, Prentiss County, MS, Tishomingo County, MS, Bedford County, TN, Bledsoe County, TN, Cannon County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hardin County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Meigs County, TN, Moore County, TN, Overton County, TN, Putnam County, TN, Rhea County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Northeast Alabama radar (KHTX), 83 km from the middle of the area, began a volume at 23:36 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

Nashville Metro, TN (KBNA), launched 12:00Z, 11.6 hours before the alert went out and 111 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: 77 J/kg
Mixed-layer CIN: -196 J/kg
Mixed-layer LCL: 1248 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 209 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
Oct 6, 3:28 PM CDT	Mesoscale Discussion	SPC	Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 8 more	62 min
Oct 6, 9:31 AM CDT	Mesoscale Discussion	SPC	Adams, Amite, Franklin, Jefferson, Pike, Wilkinson	119 min
Oct 6, 5:20 PM CDT	Mesoscale Discussion	SPC	DeSoto, Tate, Tunica	115 min
Oct 6, 2:49 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Cheatham, Chester, Clay, Crockett and 35 more	56 min

Nearby

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