Alert archive / Tennessee / Mesoscale Discussions in 2022

Mesoscale Discussion 313

March 22, 2022Jackson County, Alabama; 4 counties in Georgia; 26 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2022, 4:55 PM CDT for Jackson County, Alabama; 4 counties in Georgia; 26 counties in Tennessee. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Mar 22, 2022, 4:55 PM CDT (21:55 UTC)
Expired: Mar 22, 2022, 6:30 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

All 31 counties

Jackson County, AL, Catoosa County, GA, Dade County, GA, Walker County, GA, Whitfield County, GA, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, Meigs County, TN, Moore County, TN, Rhea County, TN, Rutherford County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, Williamson County, TN

The radar

The Northeast Alabama radar (KHTX), 53 km from the middle of the area, began a volume at 21:59 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, 9.9 hours before the alert went out and 89 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: 2336 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 403 m²/s²
0-3 km storm-relative helicity: 358 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
Mar 22, 11:57 AM CDT	Mesoscale Discussion	SPC	Colbert, Cullman, Franklin, Lauderdale, Lawrence, Limestone and 3 more	2 hr
Mar 22, 12:42 PM CDT	Tornado Watch	SPC	Choctaw, Clarke, Colbert, Fayette, Franklin, Greene and 12 more	6 hr
Mar 22, 2:56 PM CDT	Mesoscale Discussion	SPC	Bibb, Choctaw, Clarke, Fayette, Franklin, Greene and 12 more	2 hr
Mar 22, 4:08 PM CDT	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Chilton and 14 more	7 hr
Mar 22, 5:33 PM CDT	Mesoscale Discussion	SPC	Choctaw, Clarke, Marengo, Mobile, Sumter, Washington	87 min
Mar 22, 5:57 PM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Cullman, Greene, Hale and 8 more	93 min

Nearby

Mesoscale Discussions in Tennessee, 2022 Mesoscale Discussions in Georgia, 2022 Mesoscale Discussions in Alabama, 2022 Every mesoscale discussion in 2022

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.