Alert archive / Mississippi / Mesoscale Discussions in 2022

Mesoscale Discussion 7

January 1, 202211 counties in Arkansas; 15 parishes in Louisiana; 33 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 1, 2022, 11:37 AM CST for 11 counties in Arkansas; 15 parishes in Louisiana; 33 counties in Mississippi. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jan 1, 2022, 11:37 AM CST (17:37 UTC)
Expired: Jan 1, 2022, 1:30 PM CST
In force: 113 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...tornado watch likely
Chance of a watch: 95%

All 59 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Phillips County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Madison County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 175 km from the middle of the area, began a volume at 17:41 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 5Jan 1, 1:30 PM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.6 hours before the alert went out and 165 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: 387 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 714 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 265 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.3

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
Dec 31, 9:08 PM CST	Mesoscale Discussion	SPC	Cleburne, Conway, Craighead, Cross, Faulkner, Garland and 24 more	3 hr
Dec 31, 10:35 PM CST	Severe Thunderstorm Watch	SPC	Clark, Cleburne, Conway, Faulkner, Garland, Hot Spring and 26 more	353 days
Dec 31, 11:57 PM CST	Tornado Watch	SPC	Clay, Craighead, Cross, Greene, Mississippi, Poinsett	7 hr
Jan 1, 2:07 AM CST	Mesoscale Discussion	SPC	Cleburne, Craighead, Cross, Greene, Independence, Jackson and 4 more	113 min
Jan 1, 1:30 PM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more	9 hr
Jan 1, 1:57 PM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Calhoun, Carroll, Chickasaw, Choctaw and 15 more	93 min
Jan 1, 3:27 PM CST	Mesoscale Discussion	SPC	Alcorn, Itawamba, Lee, Pontotoc, Prentiss, Tishomingo and 1 more	93 min

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.