Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 6

January 10, 201310 parishes in Louisiana; 15 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2013, 5:47 AM CST for 10 parishes in Louisiana; 15 counties in Mississippi. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jan 10, 2013, 5:47 AM CST (11:47 UTC)
Expired: Jan 10, 2013, 6:45 AM CST
In force: 58 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 25 counties

Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Covington County, MS, Forrest County, MS, Hancock County, MS, Harrison County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Simpson County, MS, Stone County, MS, Walthall County, MS

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 2Jan 10, 6:15 AM CST

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.8 hours before the alert went out and 69 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: 196 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 447 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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, 6:14 AM CST	Tornado Watch	SPC	Ascension, Assumption, Concordia, East Baton Rouge, East Feliciana, Iberville and 17 more	11 hr
Jan 10, 7:36 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Jefferson, Lafourche and 12 more	84 min
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 Mississippi, 2013 Mesoscale Discussions in Louisiana, 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.