Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 2326

November 15, 201124 parishes in Louisiana; Wilkinson County, Mississippi; Newton County, Orange County, Sabine County, Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 15, 2011, 5:44 PM CST for 24 parishes in Louisiana; Wilkinson County, Mississippi; Newton County, Orange County, Sabine County, Texas. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Nov 15, 2011, 5:44 PM CST (23:44 UTC)
Expired: Nov 15, 2011, 6:45 PM CST
In force: 61 min
Issued by: the Storm Prediction Center

All 28 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Wilkinson County, MS, Newton County, TX, Orange County, TX, Sabine County, TX

The radar

The Lake Charles radar (KLCH), 90 km from the middle of the area, began a volume at 23:47 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 886Nov 15, 5:55 PM CST

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.7 hours before the alert went out and 88 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: 26 J/kg
Mixed-layer CIN: -395 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Nov 15, 2:30 PM CST	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, Cameron, De Soto, Natchitoches and 3 more	2 hr
Nov 15, 5:56 PM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 23 more	7 hr
Nov 15, 12:02 AM CST	Mesoscale Discussion	SPC	Bandera, Bexar, Dimmit, Edwards, Frio, Kerr and 8 more	2 hr
Nov 15, 2:14 AM CST	Severe Thunderstorm Watch	SPC	Bandera, Dimmit, Edwards, Frio, Gillespie, Kendall and 10 more	7 hr
Nov 15, 5:35 AM CST	Mesoscale Discussion	SPC	Atascosa, Bexar, Blanco, Comal, Duval, Frio and 10 more	85 min
Nov 15, 6:38 AM CST	Severe Thunderstorm Watch	SPC	Atascosa, Bastrop, Bexar, Blanco, Caldwell, Comal and 10 more	6 hr
Nov 15, 8:57 AM CST	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Austin, Brazoria, Brazos, Burleson and 38 more	9 hr
Nov 15, 10:35 AM CST	Mesoscale Discussion	SPC	Atascosa, Bexar, Blanco, Comal, Duval, Frio and 10 more	115 min
Nov 15, 3:49 PM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Delta, Fannin, Franklin and 6 more	116 min

Nearby

Mesoscale Discussions in Louisiana, 2011 Mesoscale Discussions in Texas, 2011 Mesoscale Discussions in Mississippi, 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.