Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 138

February 10, 201325 parishes in Louisiana; 8 counties in Mississippi; Jasper County, Newton County, Sabine County, Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2013, 10:19 AM CST for 25 parishes in Louisiana; 8 counties in Mississippi; Jasper County, Newton County, Sabine County, Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Feb 10, 2013, 10:19 AM CST (16:19 UTC)
Expired: Feb 10, 2013, 11:45 AM CST
In force: 86 min
Issued by: the Storm Prediction Center

All 36 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson 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, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Yazoo County, MS, Jasper County, TX, Newton County, TX, Sabine County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 32Feb 10, 11:10 AM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 4.3 hours before the alert went out and 178 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: 323 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 384 m²/s²
0-3 km storm-relative helicity: 448 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 10, 4:18 AM CST	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more	5 hr
Feb 10, 5:12 AM CST	Mesoscale Discussion	SPC	Sabine	93 min
Feb 10, 6:20 AM CST	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 18 more	85 min
Feb 10, 6:58 AM CST	Tornado Watch	SPC	Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 24 more	7 hr
Feb 10, 10:53 AM CST	Mesoscale Discussion	SPC	Avoyelles, Concordia, Evangeline, Pointe Coupee, Saint Landry, West Feliciana	97 min
Feb 10, 11:10 AM CST	Tornado Watch	SPC	Avoyelles, Catahoula, Concordia, East Baton Rouge, East Feliciana, Evangeline and 12 more	7 hr
Feb 10, 1:59 PM CST	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 5 more	91 min
Feb 10, 3:47 PM CST	Mesoscale Discussion	SPC	Saint Helena, Washington	88 min
Feb 10, 5:03 PM CST	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Evangeline, Livingston, Pointe Coupee, Saint Helena and 6 more	27 min
Feb 10, 5:34 PM CST	Tornado Watch	SPC	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more	5 hr
Feb 10, 2:39 PM CST	Mesoscale Discussion	SPC	George, Greene, Wayne	66 min
Feb 10, 3:14 PM CST	Tornado Watch	SPC	George, Greene, Harrison, Jackson, Perry, Stone and 1 more	8 hr
Feb 9, 11:12 PM CST	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Comanche, Concho and 21 more	2 hr
Feb 9, 11:37 PM CST	Severe Thunderstorm Watch	SPC	Bell, Bosque, Brown, Callahan, Coleman, Collin and 52 more	6 hr
Feb 10, 12:41 AM CST	Mesoscale Discussion	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 11 more	94 min
Feb 10, 1:33 AM CST	Tornado Watch	SPC	Anderson, Bandera, Bastrop, Bell, Blanco, Brazos and 22 more	6 hr
Feb 10, 2:39 AM CST	Mesoscale Discussion	SPC	Bosque, Camp, Cherokee, Collin, Coryell, Dallas and 33 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.