Alert archive / Tennessee / Mesoscale Discussions in 2013

Mesoscale Discussion 28

January 13, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2013, 2:46 PM CST for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jan 13, 2013, 2:46 PM CST (20:46 UTC)
Expired: Jan 13, 2013, 4:45 PM CST
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 53 counties

Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Morgan County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Adair County, KY, Allen County, KY, Barren County, KY, Cumberland County, KY, Metcalfe County, KY, Monroe County, KY, Simpson County, KY, Warren County, KY, Kemper County, MS, Lauderdale County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Bedford County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Davidson County, TN, DeKalb County, TN, Giles County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Williamson County, TN, Wilson County, TN

The radar

The Northeast Alabama radar (KHTX), 109 km from the middle of the area, began a volume at 20:47 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, 8.8 hours before the alert went out and 161 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: 36 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 359 m²/s²
0-3 km storm-relative helicity: 389 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
Jan 12, 9:25 PM CST	Mesoscale Discussion	SPC	Fulton	2 hr
Jan 12, 10:47 PM CST	Mesoscale Discussion	SPC	Boone, Campbell, Carroll, Gallatin, Henderson, Kenton and 1 more	88 min
Jan 12, 11:29 PM CST	Tornado Watch	SPC	Benton, Bolivar, Coahoma, DeSoto, Humphreys, Issaquena and 12 more	5 hr
Jan 13, 1:18 AM CST	Mesoscale Discussion	SPC	Bolivar, Coahoma	87 min
Jan 13, 3:53 AM CST	Mesoscale Discussion	SPC	Bolivar, Calhoun, Carroll, Coahoma, Grenada, Holmes and 18 more	97 min
Jan 13, 2:30 PM CST	Mesoscale Discussion	SPC	Covington, Forrest, George, Greene, Hancock, Harrison and 8 more	90 min
Jan 13, 10:11 AM CST	Mesoscale Discussion	SPC	Bedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 14 more	94 min

Nearby

Mesoscale Discussions in Tennessee, 2013 Mesoscale Discussions in Alabama, 2013 Mesoscale Discussions in Kentucky, 2013 Every mesoscale discussion in 2013

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.