Alert archive / Louisiana / Mesoscale Discussions in 2022

Mesoscale Discussion 86

January 19, 20224 states

The Storm Prediction Center issued this mesoscale discussion at Jan 19, 2022, 11:53 AM CST for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jan 19, 2022, 11:53 AM CST (17:53 UTC)
Expired: Jan 19, 2022, 2:30 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 60%

All 51 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Ouachita County, AR, Union County, AR, Beauregard Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Coahoma County, MS, Sunflower County, MS, Washington County, MS, Angelina County, TX, Hardin County, TX, Jasper County, TX, Liberty County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX

The radar

The Shreveport radar (KSHV), 85 km from the middle of the area, began a volume at 17:55 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.9 hours before the alert went out and 204 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: 24 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 938 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 19, 1:07 PM CST	Severe Thunderstorm Watch	SPC	Columbia, Union	8 hr
Jan 19, 2:20 PM CST	Severe Thunderstorm Watch	SPC	Ashley, Bradley, Chicot, Desha, Drew	5 hr
Jan 19, 5:47 PM CST	Mesoscale Discussion	SPC	Columbia, Union	118 min
Jan 19, 3:00 PM CST	Mesoscale Discussion	SPC	Caldwell, Catahoula, East Carroll, Franklin, Jackson, Madison and 5 more	2 hr
Jan 19, 5:18 PM CST	Mesoscale Discussion	SPC	East Carroll, Franklin, Madison, Ouachita, Richland, Tensas and 1 more	117 min

Nearby

Mesoscale Discussions in Louisiana, 2022 Mesoscale Discussions in Texas, 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.