Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 151

February 11, 201318 parishes in Louisiana; 9 counties in Mississippi; Jasper County, Newton County, Tyler County, Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 11, 2013, 1:01 PM CST for 18 parishes in Louisiana; 9 counties in Mississippi; Jasper County, Newton County, Tyler County, Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Feb 11, 2013, 1:01 PM CST (19:01 UTC)
Expired: Feb 11, 2013, 2:30 PM CST
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 30 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Tangipahoa Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Franklin County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS, Jasper County, TX, Newton County, TX, Tyler County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 7.0 hours before the alert went out and 121 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 729 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 237 m²/s²
0-3 km storm-relative helicity: 333 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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, 9:32 PM CST	Mesoscale Discussion	SPC	East Baton Rouge, Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington	88 min
Feb 10, 6:23 PM CST	Mesoscale Discussion	SPC	Forrest, George, Greene, Jones, Lamar, Marion and 4 more	97 min
Feb 11, 1:55 AM CST	Mesoscale Discussion	SPC	Forrest, Greene, Jones, Lamar, Marion, Perry and 1 more	95 min
Feb 11, 2:18 AM CST	Mesoscale Discussion	SPC	Atascosa, Bee, DeWitt, Duval, Goliad, Jackson and 9 more	87 min

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.