Alert archive / Tennessee / Mesoscale Discussions in 2023

Mesoscale Discussion 409

March 31, 2023Shelby County, Tipton County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2023, 5:14 PM CDT for Shelby County, Tipton County, Tennessee. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2023, 5:14 PM CDT (22:14 UTC)
Expired: Mar 31, 2023, 5:45 PM CDT
In force: 31 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 94

Counties Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 5 km from the middle of the area, began a volume at 22:18 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 12:00Z, 10.2 hours before the alert went out and 60 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: 30 J/kg
Mixed-layer CIN: -335 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 490 m²/s²
0-3 km storm-relative helicity: 655 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 31, 10:44 AM CDT	Mesoscale Discussion	SPC	Shelby, Tipton	2 hr
Mar 31, 10:47 AM CDT	Mesoscale Discussion	SPC	Fayette, Hardeman, Shelby	58 min
Mar 31, 12:28 PM CDT	Tornado Watch PDS	SPC	Crockett, Dyer, Fayette, Gibson, Haywood, Lake and 5 more	11 hr
Mar 31, 3:42 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 19 more	93 min
Mar 31, 5:28 PM CDT	Mesoscale Discussion	SPC	Bedford, Benton, Carroll, Cheatham, Chester, Davidson and 25 more	92 min
Mar 31, 5:58 PM CDT	Tornado Watch PDS	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 34 more	6 hr
Mar 31, 6:34 PM CDT	Mesoscale Discussion	SPC	Shelby	56 min
Mar 31, 6:59 PM CDT	Mesoscale Discussion	SPC	Shelby	61 min

Nearby

Mesoscale Discussions in Tennessee, 2023 Every mesoscale discussion in 2023

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.