Alert archive / Mississippi / Mesoscale Discussions in 2019

Mesoscale Discussion 124

February 23, 20197 counties in Arkansas; 23 parishes in Louisiana; 30 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 23, 2019, 10:52 AM CST for 7 counties in Arkansas; 23 parishes in Louisiana; 30 counties in Mississippi. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Feb 23, 2019, 10:52 AM CST (16:52 UTC)
Expired: Feb 23, 2019, 12:45 PM CST
In force: 113 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 60 counties

Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Union County, AR, Avoyelles Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Coahoma County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Quitman County, MS, Rankin County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 149 km from the middle of the area, began a volume at 16:56 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 5Feb 23, 12:25 PM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 4.9 hours before the alert went out and 139 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: 735 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 553 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 278 m²/s²
0-3 km storm-relative helicity: 383 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 6.4

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 23, 6:57 AM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Columbia, Lafayette, Miller, Nevada and 2 more	2 hr
Feb 23, 12:26 PM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Chicot, Cleveland, Crittenden and 6 more	8 hr
Feb 23, 2:35 PM CST	Mesoscale Discussion	SPC	Attala, Choctaw, Clay, Holmes, Leake, Madison and 5 more	55 min
Feb 23, 5:01 PM CST	Mesoscale Discussion	SPC	Kemper, Lowndes, Noxubee	119 min

Nearby

Mesoscale Discussions in Mississippi, 2019 Mesoscale Discussions in Louisiana, 2019 Mesoscale Discussions in Arkansas, 2019 Every mesoscale discussion in 2019

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.