Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 1099

June 5, 201122 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2011, 11:01 AM CDT for 22 parishes in Louisiana. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 5, 2011, 11:01 AM CDT (16:01 UTC)
Expired: Jun 5, 2011, 12:30 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 22 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, Iberia Parish, LA, Iberville 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 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, Terrebonne Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.0 hours before the alert went out and 137 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: 1941 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1529 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 61 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
Jun 5, 5:35 PM CDT	Mesoscale Discussion	SPC	Beauregard, Bienville, Bossier, Caddo, De Soto, Natchitoches and 4 more	115 min
Jun 5, 6:13 PM CDT	Mesoscale Discussion	SPC	Ascension, Avoyelles, Caldwell, Catahoula, Concordia, East Baton Rouge and 27 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 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.