Alert archive / Mississippi / Mesoscale Discussions in 2022

Mesoscale Discussion 1978

November 29, 2022Ashley County, Chicot County, Arkansas; 19 parishes in Louisiana; 38 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 29, 2022, 11:20 AM CST for Ashley County, Chicot County, Arkansas; 19 parishes in Louisiana; 38 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 29, 2022, 11:20 AM CST (17:20 UTC)
Expired: Nov 29, 2022, 1:45 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...tornado watch likely
Chance of a watch: 95%

All 59 counties

Ashley County, AR, Chicot County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Kemper County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 80 km from the middle of the area, began a volume at 17:22 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.

Tornado Watch 572Nov 29, 12:10 PM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.3 hours before the alert went out and 71 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: 1026 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 361 m²/s²
0-3 km storm-relative helicity: 372 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, 12:11 PM CST	Tornado Watch PDS	SPC	Ashley, Chicot	7 hr
Nov 29, 2:28 PM CST	Mesoscale Discussion	SPC	East Carroll, Franklin, Madison, Tensas	2 hr
Nov 29, 5:12 PM CST	Mesoscale Discussion	SPC	Caldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 7 more	93 min
Nov 29, 10:56 AM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Itawamba, Lafayette, Lee, Marshall and 5 more	2 hr
Nov 29, 1:52 PM CST	Mesoscale Discussion	SPC	George, Greene, Jackson, Wayne	113 min
Nov 29, 4:45 PM CST	Mesoscale Discussion	SPC	Clarke, Forrest, Greene, Jones, Lamar, Marion and 2 more	90 min
Nov 29, 5:07 PM CST	Tornado Watch	SPC	Clarke, Covington, Forrest, Greene, Jasper, Jones and 6 more	6 hr

Nearby

Mesoscale Discussions in Mississippi, 2022 Mesoscale Discussions in Louisiana, 2022 Mesoscale Discussions in Arkansas, 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.