Alert archive / Mississippi / Mesoscale Discussions in 2020

Mesoscale Discussion 32

January 11, 20209 counties in Alabama; 14 parishes in Louisiana; 37 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 7:39 AM CST for 9 counties in Alabama; 14 parishes in Louisiana; 37 counties in Mississippi. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jan 11, 2020, 7:39 AM CST (13:39 UTC)
Expired: Jan 11, 2020, 9:15 AM CST
In force: 96 min
Issued by: the Storm Prediction Center

All 60 counties

Choctaw County, AL, Clarke County, AL, Greene County, AL, Hale County, AL, Marengo County, AL, Mobile County, AL, Pickens County, AL, Sumter County, AL, Washington County, AL, Ascension Parish, LA, Assumption Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Amite County, MS, Attala County, MS, Choctaw County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 75 km from the middle of the area, began a volume at 13:38 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 13Jan 11, 8:00 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 1.7 hours before the alert went out and 84 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: 795 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 364 m²/s²
0-3 km storm-relative helicity: 593 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 10.2

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 11, 6:12 AM CST	Mesoscale Discussion	SPC	Colbert, Lauderdale, Limestone, Madison	93 min
Jan 11, 6:57 AM CST	Tornado Watch	SPC	Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 7 more	7 hr
Jan 11, 7:57 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Chilton and 22 more	9 hr
Jan 11, 9:28 AM CST	Mesoscale Discussion	SPC	Blount, Cullman, DeKalb, Fayette, Jackson, Lawrence and 7 more	92 min
Jan 11, 9:54 AM CST	Mesoscale Discussion	SPC	Choctaw, Greene, Marengo, Pickens, Sumter, Washington	96 min
Jan 11, 11:50 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Choctaw, Clarke, Cullman and 15 more	85 min
Jan 11, 12:20 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 9 more	85 min
Jan 11, 12:42 PM CST	Tornado Watch	SPC	Barbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 15 more	7 hr
Jan 11, 1:15 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Chilton, DeKalb, Etowah and 6 more	90 min
Jan 11, 2:26 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Coffee, Covington, Crenshaw and 10 more	94 min
Jan 11, 2:44 PM CST	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	5 hr
Jan 11, 3:16 PM CST	Mesoscale Discussion	SPC	Bullock, Chambers, Clay, Cleburne, Lee, Macon and 3 more	89 min
Jan 11, 5:21 PM CST	Mesoscale Discussion	SPC	Houston	114 min
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, 2:22 AM CST	Mesoscale Discussion	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Richland and 2 more	53 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 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

Nearby

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