Alert archive / Louisiana / Mesoscale Discussions in 2006

Mesoscale Discussion 2333

December 30, 200615 parishes in Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 30, 2006, 10:22 AM CST for 15 parishes in Louisiana; 6 counties in Mississippi. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Dec 30, 2006, 10:22 AM CST (16:22 UTC)
Expired: Dec 30, 2006, 11:45 AM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 21 counties

Ascension Parish, LA, Assumption 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 James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The watches that followed

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

Tornado Watch 892Dec 30, 1:30 PM CST

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.4 hours before the alert went out and 51 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 413 m²/s²
0-3 km storm-relative helicity: 525 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
Dec 29, 7:52 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 18 more	53 min
Dec 29, 8:19 PM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 23 more	10 hr
Dec 29, 11:41 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 24 more	94 min
Dec 30, 3:14 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Assumption, Avoyelles, Beauregard, Bienville and 30 more	91 min
Dec 30, 5:43 AM CST	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 19 more	6 hr
Dec 30, 7:49 AM CST	Mesoscale Discussion	SPC	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint John the Baptist and 3 more	86 min
Dec 30, 8:43 AM CST	Tornado Watch	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 5 more	5 hr
Dec 30, 1:13 PM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Saint Bernard, Saint Charles, Saint Tammany	62 min
Dec 30, 1:30 PM CST	Tornado Watch	SPC	Jefferson, Lafourche, Livingston, Orleans, Plaquemines, Saint Bernard and 6 more	7 hr
Dec 30, 5:45 PM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 4 more	60 min

Nearby

Mesoscale Discussions in Louisiana, 2006 Mesoscale Discussions in Mississippi, 2006 Every mesoscale discussion in 2006

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.