Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 7

January 10, 201318 parishes in Louisiana; 17 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2013, 7:36 AM CST for 18 parishes in Louisiana; 17 counties in Mississippi. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jan 10, 2013, 7:36 AM CST (13:36 UTC)
Expired: Jan 10, 2013, 9:00 AM CST
In force: 84 min
Issued by: the Storm Prediction Center

All 35 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, 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, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wilkinson County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.6 hours before the alert went out and 103 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: 581 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 442 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 313 m²/s²
0-3 km storm-relative helicity: 334 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.3

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
Jan 9, 6:18 PM CST	Mesoscale Discussion	SPC	Assumption, Iberia, Jefferson, Lafourche, Orleans, Plaquemines and 5 more	117 min
Jan 10, 4:05 AM CST	Mesoscale Discussion	SPC	Acadia, Avoyelles, Concordia, Evangeline, Iberia, Iberville and 7 more	85 min
Jan 10, 4:31 AM CST	Tornado Watch	SPC	Acadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 16 more	6 hr
Jan 10, 5:47 AM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 4 more	58 min
Jan 10, 6:14 AM CST	Tornado Watch	SPC	Ascension, Assumption, Concordia, East Baton Rouge, East Feliciana, Iberville and 17 more	11 hr
Jan 10, 11:35 AM CST	Mesoscale Discussion	SPC	Orleans, Plaquemines, Saint Bernard	85 min
Jan 10, 5:40 PM CST	Mesoscale Discussion	SPC	Tunica	2 hr

Nearby

Mesoscale Discussions in Louisiana, 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.