Alert archive / Tennessee / Mesoscale Discussions in 2020

Mesoscale Discussion 266

March 28, 20208 counties in Alabama; 15 counties in Mississippi; 17 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2020, 11:27 PM CDT for 8 counties in Alabama; 15 counties in Mississippi; 17 counties in Tennessee. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Mar 28, 2020, 11:27 PM CDT (04:27 UTC)
Expired: Mar 29, 2020, 1:00 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 40 counties

Colbert County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Marion County, AL, Winston County, AL, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Itawamba County, MS, Lee County, MS, Monroe County, MS, Montgomery County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Tishomingo County, MS, Webster County, MS, Bedford County, TN, Cannon County, TN, Cheatham County, TN, Davidson County, TN, DeKalb County, TN, Giles County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Rutherford County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN

The radar

The Columbus AFB radar (KGWX), 64 km from the middle of the area, began a volume at 04:28 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

Little Rock, AR (KLZK), launched 00:00Z, 4.5 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 768 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 92 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 28, 8:25 PM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Lawrence, Marion	95 min
Mar 28, 9:58 PM CDT	Tornado Watch	SPC	Blount, Colbert, Cullman, DeKalb, Fayette, Franklin and 16 more	7 hr
Mar 29, 1:50 AM CDT	Mesoscale Discussion	SPC	Jackson, Lawrence, Limestone, Madison	85 min
Mar 29, 2:17 AM CDT	Mesoscale Discussion	SPC	Blount, Cullman, Fayette, Jefferson, Lamar, Marion and 4 more	88 min
Mar 28, 7:46 PM CDT	Mesoscale Discussion	SPC	Attala, Claiborne, Hinds, Holmes, Humphreys, Issaquena and 7 more	89 min
Mar 28, 9:34 PM CDT	Tornado Watch	SPC	Bedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 28 more	6 hr

Nearby

Mesoscale Discussions in Tennessee, 2020 Mesoscale Discussions in Mississippi, 2020 Mesoscale Discussions in Alabama, 2020 Every mesoscale discussion in 2020

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.