Alert archive / Mississippi / Mesoscale Discussions in 2020

Mesoscale Discussion 27

January 11, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 3:52 AM CST for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jan 11, 2020, 3:52 AM CST (09:52 UTC)
Expired: Jan 11, 2020, 5:15 AM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 31 counties

Crittenden County, AR, Desha County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, St. Francis County, AR, Pemiscot County, MO, Benton County, MS, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Yalobusha County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Hardeman County, TN, Haywood County, TN, Lauderdale County, TN, Madison County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 49 km from the middle of the area, began a volume at 09:54 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 10Jan 11, 4:15 AM CST

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 9.9 hours before the alert went out and 22 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: 346 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 532 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 385 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

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
Jan 10, 7:30 PM CST	Mesoscale Discussion	SPC	Baxter, Boone, Clark, Cleburne, Columbia, Conway and 34 more	2 hr
Jan 10, 10:40 PM CST	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 40 more	2 hr
Jan 10, 11:58 PM CST	Tornado Watch	SPC	Ashley, Chicot, Clay, Craighead, Crittenden, Cross and 6 more	7 hr
Jan 11, 12:28 AM CST	Tornado Watch	SPC	Union	8 hr
Jan 11, 2:22 AM CST	Mesoscale Discussion	SPC	Adams, Claiborne, Copiah, Franklin, Hinds, Humphreys and 8 more	53 min
Jan 11, 2:37 AM CST	Tornado Watch	SPC	Adams, Attala, Carroll, Choctaw, Claiborne, Copiah and 22 more	8 hr
Jan 11, 4:17 AM CST	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 8 more	6 hr
Jan 11, 4:31 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 11 more	59 min
Jan 11, 5:06 AM CST	Mesoscale Discussion	SPC	Alcorn, Benton, DeSoto, Lafayette, Lee, Marshall and 7 more	54 min
Jan 11, 5:18 AM CST	Tornado Watch	SPC	Amite, Hancock, Pearl River, Pike, Walthall, Wilkinson	7 hr
Jan 11, 7:39 AM CST	Mesoscale Discussion	SPC	Amite, Attala, Choctaw, Clarke, Copiah, Covington and 31 more	96 min
Jan 11, 7:57 AM CST	Tornado Watch	SPC	Clarke, Clay, Covington, Forrest, George, Greene and 20 more	9 hr
Jan 11, 9:54 AM CST	Mesoscale Discussion	SPC	Clarke, Forrest, Greene, Jasper, Jones, Kemper and 10 more	96 min
Jan 11, 3:10 PM CST	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Cole, Crawford, Franklin and 15 more	4 hr
Jan 11, 6:12 AM CST	Mesoscale Discussion	SPC	Benton, Cheatham, Davidson, Dickson, Giles, Hickman and 14 more	93 min
Jan 11, 6:57 AM CST	Tornado Watch	SPC	Bedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 34 more	7 hr
Jan 11, 8:20 AM CST	Mesoscale Discussion	SPC	Bledsoe, Cannon, Clay, Cumberland, DeKalb, Fentress and 11 more	55 min
Jan 11, 9:28 AM CST	Mesoscale Discussion	SPC	Bedford, Bledsoe, Cannon, Clay, Coffee, Cumberland and 27 more	92 min
Jan 11, 12:20 PM CST	Mesoscale Discussion	SPC	Bledsoe, Bradley, Franklin, Grundy, Hamilton, McMinn and 6 more	85 min
Jan 11, 12:42 PM CST	Tornado Watch	SPC	Anderson, Bledsoe, Blount, Bradley, Coffee, Cumberland and 18 more	7 hr
Jan 11, 3:16 PM CST	Mesoscale Discussion	SPC	Anderson, Blount, Bradley, Jefferson, Knox, Loudon and 9 more	89 min
Jan 11, 5:36 PM CST	Mesoscale Discussion	SPC	Carter, Cocke, Greene, Hamblen, Hancock, Hawkins and 4 more	84 min

Nearby

Mesoscale Discussions in Mississippi, 2020 Mesoscale Discussions in Tennessee, 2020 Mesoscale Discussions in Arkansas, 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.