Alert archive / Louisiana / Mesoscale Discussions in 2022

Mesoscale Discussion 307

March 22, 202226 parishes in Louisiana; 17 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2022, 6:15 AM CDT for 26 parishes in Louisiana; 17 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Mar 22, 2022, 6:15 AM CDT (11:15 UTC)
Expired: Mar 22, 2022, 7:45 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 58...59

All 43 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Tyler County, TX

The radar

The Ft Polk radar (KPOE), 74 km from the middle of the area, began a volume at 11:17 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 60Mar 22, 7:05 AM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 11.3 hours before the alert went out and 83 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: 320 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 676 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 458 m²/s²
0-3 km storm-relative helicity: 572 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 13.6

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
Mar 21, 7:03 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto	57 min
Mar 21, 8:09 PM CDT	Tornado Watch	SPC	Bossier, Caddo, De Soto, Sabine, Webster	6 hr
Mar 21, 10:51 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo	114 min
Mar 22, 1:08 AM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Webster	97 min
Mar 22, 1:58 AM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 4 more	5 hr
Mar 22, 4:00 AM CDT	Mesoscale Discussion	SPC	Bienville, Claiborne, De Soto, Jackson, Lincoln, Natchitoches and 3 more	2 hr
Mar 22, 7:08 AM CDT	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 19 more	8 hr
Mar 22, 9:43 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Cameron, Concordia, East Baton Rouge and 14 more	2 hr
Mar 22, 10:40 AM CDT	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more	8 hr
Mar 22, 12:19 PM CDT	Mesoscale Discussion	SPC	Saint Helena, Tangipahoa, Washington	116 min
Mar 22, 3:05 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Livingston, Orleans, Saint Charles and 6 more	115 min
Mar 22, 5:33 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Livingston, Orleans, Saint Helena, Saint James and 4 more	87 min
Mar 21, 7:24 PM CDT	Mesoscale Discussion	SPC	Anderson, Bastrop, Bell, Brazos, Burleson, Caldwell and 32 more	96 min
Mar 21, 9:12 PM CDT	Mesoscale Discussion	SPC	Anderson, Brazos, Cherokee, Freestone, Henderson, Houston and 8 more	93 min
Mar 21, 10:10 PM CDT	Mesoscale Discussion	SPC	Bee, Duval, Jim Wells, Live Oak, McMullen, Refugio and 2 more	95 min
Mar 22, 12:38 AM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Caldwell, Colorado and 27 more	67 min
Mar 22, 12:59 AM CDT	Tornado Watch	SPC	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 20 more	8 hr

Nearby

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