Alert archive / Mississippi / Mesoscale Discussions in 2020

Mesoscale Discussion 26

January 11, 20208 parishes in Louisiana; 14 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 2:22 AM CST for 8 parishes in Louisiana; 14 counties in Mississippi. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Jan 11, 2020, 2:22 AM CST (08:22 UTC)
Expired: Jan 11, 2020, 3:15 AM CST
In force: 53 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 22 counties

Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lincoln County, MS, Madison County, MS, Rankin County, MS, Sharkey County, MS, Warren County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 107 km from the middle of the area, began a volume at 08:25 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 9Jan 11, 2:35 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 8.4 hours before the alert went out and 98 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: 213 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 607 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 306 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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
Jan 10, 7:30 PM CST	Mesoscale Discussion	SPC	Bossier, Caddo, Webster	2 hr
Jan 10, 10:40 PM CST	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 2 more	2 hr
Jan 11, 12:21 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 11 more	99 min
Jan 11, 12:28 AM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 24 more	8 hr
Jan 11, 1:19 AM CST	Mesoscale Discussion	SPC	Bienville, Caldwell, Claiborne, De Soto, Jackson, Lincoln and 7 more	86 min
Jan 11, 2:37 AM CST	Tornado Watch	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more	8 hr
Jan 11, 4:31 AM CST	Mesoscale Discussion	SPC	Acadia, Ascension, Avoyelles, Caldwell, Catahoula, Concordia and 21 more	59 min
Jan 11, 5:18 AM CST	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more	7 hr
Jan 11, 7:39 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 8 more	96 min
Jan 10, 11:58 PM CST	Tornado Watch	SPC	Bolivar, Coahoma, DeSoto, Leflore, Marshall, Panola and 6 more	7 hr
Jan 11, 3:52 AM CST	Mesoscale Discussion	SPC	Benton, Bolivar, Coahoma, DeSoto, Grenada, Lafayette and 9 more	83 min
Jan 11, 4:17 AM CST	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 8 more	6 hr
Jan 11, 5:06 AM CST	Mesoscale Discussion	SPC	Alcorn, Benton, DeSoto, Lafayette, Lee, Marshall and 7 more	54 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

Nearby

Mesoscale Discussions in Mississippi, 2020 Mesoscale Discussions in Louisiana, 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.