Alert archive / Tennessee / Mesoscale Discussions in 2016

Mesoscale Discussion 1848

November 29, 20168 counties in Alabama; Dade County, Georgia; 15 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Nov 29, 2016, 9:28 PM CST for 8 counties in Alabama; Dade County, Georgia; 15 counties in Tennessee. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Nov 29, 2016, 9:28 PM CST (03:28 UTC)
Expired: Nov 29, 2016, 10:30 PM CST
In force: 62 min
Issued by: the Storm Prediction Center

All 24 counties

Cullman County, AL, DeKalb County, AL, Jackson County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Dade County, GA, Bedford County, TN, Bledsoe County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN

The radar

The Northeast Alabama radar (KHTX), 23 km from the middle of the area, began a volume at 03:32 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 3.5 hours before the alert went out and 119 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1648 m above ground
0-6 km bulk shear: 90 kt
0-1 km storm-relative helicity: 321 m²/s²
0-3 km storm-relative helicity: 354 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 29, 6:43 PM CST	Mesoscale Discussion	SPC	Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more	92 min
Nov 29, 6:47 PM CST	Tornado Watch	SPC	Cullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more	8 hr
Nov 29, 8:03 PM CST	Mesoscale Discussion	SPC	Choctaw, Fayette, Greene, Hale, Lamar, Pickens and 2 more	2 hr
Nov 29, 8:50 PM CST	Tornado Watch	SPC	Bibb, Blount, Fayette, Greene, Hale, Jefferson and 7 more	8 hr
Nov 29, 10:28 PM CST	Tornado Watch	SPC	Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more	5 hr
Nov 29, 11:17 PM CST	Mesoscale Discussion	SPC	DeKalb, Jackson, Lawrence, Limestone, Madison, Morgan	118 min
Nov 29, 11:37 PM CST	Mesoscale Discussion	SPC	Fayette, Lamar, Pickens	113 min
Nov 30, 1:07 AM CST	Mesoscale Discussion	SPC	Blount, Cullman, DeKalb, Fayette, Jackson, Madison and 5 more	53 min
Nov 30, 2:54 AM CST	Tornado Watch	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Cleburne and 22 more	7 hr
Nov 30, 4:57 AM CST	Tornado Watch	SPC	Choctaw, Clarke, Mobile, Washington	7 hr
Nov 30, 5:10 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 27 more	95 min
Nov 30, 9:00 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Blount, Bullock, Butler and 37 more	2 hr
Nov 30, 11:06 AM CST	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Chambers, Coffee and 17 more	6 hr
Nov 30, 12:59 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Coffee, Covington, Crenshaw, Dale and 7 more	2 hr
Nov 30, 1:55 PM CST	Mesoscale Discussion	SPC	Barbour, Coffee, Covington, Dale, Geneva, Henry and 2 more	2 hr
Nov 29, 10:11 PM CST	Tornado Watch	SPC	Catoosa, Chattooga, Dade, Walker, Whitfield	5 hr
Nov 30, 2:23 PM CST	Severe Thunderstorm Watch	SPC	Baldwin, Bibb, Bleckley, Columbia, Crisp, Dooly and 22 more	3 hr
Nov 30, 4:43 PM CST	Mesoscale Discussion	SPC	Columbia, Elbert, Glascock, Hancock, Lincoln, McDuffie and 5 more	92 min
Nov 30, 4:45 PM CST	Mesoscale Discussion	SPC	Baker, Calhoun, Decatur, Dougherty, Early, Grady and 7 more	30 min
Nov 29, 11:46 PM CST	Mesoscale Discussion	SPC	Anderson, Blount, Campbell, Claiborne, Grainger, Hamblen and 6 more	119 min

Nearby

Mesoscale Discussions in Tennessee, 2016 Mesoscale Discussions in Alabama, 2016 Mesoscale Discussions in Georgia, 2016 Every mesoscale discussion in 2016

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.