Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 2214

September 28, 201132 parishes in Louisiana; 13 counties in Mississippi; Jasper County, Newton County, Orange County, Texas

The Storm Prediction Center issued this mesoscale discussion at Sep 28, 2011, 9:41 PM CDT for 32 parishes in Louisiana; 13 counties in Mississippi; Jasper County, Newton County, Orange County, Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Sep 28, 2011, 9:41 PM CDT (02:41 UTC)
Expired: Sep 28, 2011, 11:15 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 48 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Franklin County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wilkinson County, MS, Jasper County, TX, Newton County, TX, Orange County, TX

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 2.7 hours before the alert went out and 163 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: 90 J/kg
Mixed-layer CIN: -254 J/kg
Mixed-layer LCL: 1543 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -214 m²/s²
0-3 km storm-relative helicity: -103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Sep 29, 3:53 PM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bastrop, Bee, Bexar, Brazoria and 52 more	2 hr

Nearby

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