Alert archive / Mississippi / Mesoscale Discussions in 2022

Mesoscale Discussion 142

February 17, 20224 states

The Storm Prediction Center issued this mesoscale discussion at Feb 17, 2022, 10:05 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Feb 17, 2022, 10:05 AM CST (16:05 UTC)
Expired: Feb 17, 2022, 12:30 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...tornado watch likely
Chance of a watch: 80%

All 62 counties

Arkansas County, AR, Ashley County, AR, Chicot County, AR, Crittenden County, AR, Desha County, AR, Drew County, AR, Lee County, AR, Phillips County, AR, Avoyelles Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Claiborne County, MS, Coahoma County, MS, DeSoto County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lafayette 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, Tippah County, MS, Tunica County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Yalobusha County, MS, Yazoo County, MS, Chester County, TN, Fayette County, TN, Hardeman County, TN, McNairy County, TN, Shelby County, TN

The radar

The Jackson/Brandon,MS radar (KDGX), 138 km from the middle of the area, began a volume at 16:04 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.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 4.1 hours before the alert went out and 130 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: 148 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 470 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 364 m²/s²
0-3 km storm-relative helicity: 546 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.9

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
Feb 17, 3:20 AM CST	Mesoscale Discussion	SPC	Hempstead, Howard, Little River, Logan, Montgomery, Pike and 5 more	115 min
Feb 17, 7:30 AM CST	Mesoscale Discussion	SPC	Arkansas, Baxter, Bradley, Calhoun, Clark, Cleburne and 44 more	2 hr
Feb 17, 10:49 AM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Chicot, Crittenden, Cross and 10 more	7 hr
Feb 17, 1:46 PM CST	Tornado Watch	SPC	Alcorn, Clarke, Clay, Covington, Forrest, Itawamba and 18 more	6 hr
Feb 17, 1:56 PM CST	Mesoscale Discussion	SPC	Clarke, Covington, Forrest, Jasper, Jefferson Davis, Jones and 18 more	3 hr
Feb 17, 3:47 PM CST	Mesoscale Discussion	SPC	Jasper, Kemper, Lauderdale, Newton	118 min
Feb 17, 1:11 PM CST	Mesoscale Discussion	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 29 more	2 hr
Feb 17, 5:32 PM CST	Mesoscale Discussion	SPC	Bedford, Bledsoe, Cannon, Clay, Coffee, Cumberland and 13 more	88 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.