Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 2353

November 22, 201124 parishes in Louisiana; 13 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 22, 2011, 10:26 AM CST for 24 parishes in Louisiana; 13 counties in Mississippi. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Nov 22, 2011, 10:26 AM CST (16:26 UTC)
Expired: Nov 22, 2011, 12:00 PM CST
In force: 94 min
Issued by: the Storm Prediction Center

All 37 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Copiah County, MS, Franklin County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pike County, MS, Simpson County, MS, Walthall County, MS, Wilkinson County, MS

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.4 hours before the alert went out and 153 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: 764 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 253 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 5.9

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
Nov 22, 11:38 AM CST	Mesoscale Discussion	SPC	Clarke, Covington, Forrest, Greene, Jasper, Jefferson Davis and 18 more	37 min
Nov 22, 11:58 AM CST	Tornado Watch	SPC	Clarke, Covington, Forrest, Greene, Jasper, Jefferson Davis and 14 more	8 hr
Nov 22, 2:40 PM CST	Mesoscale Discussion	SPC	Greene	65 min

Nearby

Mesoscale Discussions in Louisiana, 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.