Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 157

February 12, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Feb 12, 2013, 1:57 PM CST for 4 states. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Feb 12, 2013, 1:57 PM CST (19:57 UTC)
Expired: Feb 12, 2013, 3:00 PM CST
In force: 63 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 57 counties

Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee 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, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.0 hours before the alert went out and 205 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: 819 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 291 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
Feb 11, 11:43 PM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Dallas and 7 more	92 min
Feb 12, 3:35 PM CST	Mesoscale Discussion	SPC	Baldwin, Conecuh, Escambia, Mobile, Washington	85 min
Feb 12, 5:17 PM CST	Mesoscale Discussion	SPC	Baldwin, Covington, Escambia, Geneva, Houston, Mobile	58 min
Feb 11, 6:36 PM CST	Mesoscale Discussion	SPC	Bay, Liberty	84 min
Feb 12, 11:54 AM CST	Mesoscale Discussion	SPC	Franklin, Madison, Tensas	96 min

Nearby

Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Alabama, 2013 Mesoscale Discussions in Mississippi, 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.