Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 2306

November 8, 201113 counties in Arkansas; 24 parishes in Louisiana; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 8, 2011, 5:09 PM CST for 13 counties in Arkansas; 24 parishes in Louisiana; 8 counties in Texas. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Nov 8, 2011, 5:09 PM CST (23:09 UTC)
Expired: Nov 8, 2011, 6:15 PM CST
In force: 66 min
Issued by: the Storm Prediction Center

All 45 counties

Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lafayette County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Hardin County, TX, Jasper County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX

The radar

The Shreveport radar (KSHV), 70 km from the middle of the area, began a volume at 23:08 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 877Nov 8, 5:30 PM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.2 hours before the alert went out and 66 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: 12 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 496 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 296 m²/s²
0-3 km storm-relative helicity: 361 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Nov 8, 1:17 AM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 16 more	118 min
Nov 8, 9:38 AM CST	Mesoscale Discussion	SPC	Crawford, Franklin, Sebastian	67 min
Nov 8, 10:31 AM CST	Mesoscale Discussion	SPC	Baxter, Clark, Cleburne, Columbia, Conway, Dallas and 31 more	29 min
Nov 8, 10:49 AM CST	Tornado Watch	SPC	Clark, Cleburne, Columbia, Conway, Dallas, Faulkner and 25 more	7 hr
Nov 8, 1:03 PM CST	Mesoscale Discussion	SPC	Calhoun, Clark, Columbia, Conway, Dallas, Faulkner and 22 more	57 min
Nov 8, 3:48 PM CST	Mesoscale Discussion	SPC	Clark, Cleburne, Columbia, Conway, Faulkner, Garland and 18 more	87 min
Nov 8, 5:30 PM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 17 more	7 hr
Nov 7, 6:44 PM CST	Tornado Watch	SPC	Bosque, Camp, Collin, Cooke, Coryell, Dallas and 24 more	2 hr
Nov 7, 7:43 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Haskell, Knox and 3 more	62 min
Nov 7, 8:28 PM CST	Tornado Watch	SPC	Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more	8 hr
Nov 7, 8:53 PM CST	Mesoscale Discussion	SPC	Borden, Coke, Fisher, Glasscock, Haskell, Howard and 9 more	2 hr
Nov 7, 9:16 PM CST	Tornado Watch	SPC	Borden, Callahan, Coke, Coleman, Concho, Crane and 31 more	8 hr
Nov 7, 11:20 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Knox, Wichita	85 min
Nov 8, 2:12 AM CST	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coleman and 28 more	93 min
Nov 8, 1:44 PM CST	Mesoscale Discussion	SPC	Austin, Chambers, Grimes, Hardin, Harris, Jasper and 10 more	61 min
Nov 8, 1:59 PM CST	Tornado Watch	SPC	Chambers, Grimes, Hardin, Harris, Houston, Jasper and 12 more	6 hr
Nov 8, 3:53 PM CST	Mesoscale Discussion	SPC	Angelina, Grimes, Hardin, Harris, Jasper, Liberty and 7 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2011 Mesoscale Discussions in Arkansas, 2011 Mesoscale Discussions in Texas, 2011 Every mesoscale discussion in 2011

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.