Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 5

January 10, 201313 parishes in Louisiana; Adams County, Wilkinson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2013, 4:05 AM CST for 13 parishes in Louisiana; Adams County, Wilkinson County, Mississippi. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jan 10, 2013, 4:05 AM CST (10:05 UTC)
Expired: Jan 10, 2013, 5:30 AM CST
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Acadia Parish, LA, Avoyelles Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Wilkinson County, MS

The watches that followed

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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.1 hours before the alert went out and 213 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, 4:31 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, 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 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.