Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 190

March 5, 201118 parishes in Louisiana; 11 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 5, 2011, 11:12 AM CST for 18 parishes in Louisiana; 11 counties in Mississippi. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Mar 5, 2011, 11:12 AM CST (17:12 UTC)
Expired: Mar 5, 2011, 12:45 PM CST
In force: 93 min
Issued by: the Storm Prediction Center

All 29 counties

Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines 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 Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, Forrest County, MS, George 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, Walthall County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.2 hours before the alert went out and 138 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: 960 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 451 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.8

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
Mar 4, 9:33 PM CST	Mesoscale Discussion	SPC	Saint Tammany, Tangipahoa, Washington	57 min
Mar 5, 8:40 AM CST	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 23 more	65 min
Mar 5, 8:54 AM CST	Tornado Watch	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 23 more	7 hr
Mar 5, 1:31 PM CST	Mesoscale Discussion	SPC	Plaquemines, Saint Bernard	89 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.