Alert archive / Louisiana / Mesoscale Discussions in 2004

Mesoscale Discussion 2442

November 23, 200413 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2004, 5:30 PM CST for 13 parishes in Louisiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 23, 2004, 5:30 PM CST (23:30 UTC)
Expired: Nov 23, 2004, 7:30 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Beauregard Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Vernon Parish, LA, Winn Parish, LA

The watches that followed

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

Tornado Watch 890Nov 23, 8:15 PM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.5 hours before the alert went out and 145 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: 472 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 662 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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
Nov 22, 6:03 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 26 more	2 hr
Nov 23, 9:45 AM CST	Tornado Watch	SPC	Allen, Beauregard, Calcasieu, De Soto, Grant, LaSalle and 5 more	5 hr
Nov 23, 11:10 AM CST	Mesoscale Discussion	SPC	Avoyelles, Concordia, Madison, Tensas	3 hr
Nov 23, 11:38 AM CST	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, Grant, LaSalle, Natchitoches and 4 more	2 hr
Nov 23, 12:48 PM CST	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Grant, Natchitoches, Sabine and 1 more	117 min
Nov 23, 2:00 PM CST	Tornado Watch	SPC	Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 19 more	7 hr
Nov 23, 3:21 PM CST	Mesoscale Discussion	SPC	Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 19 more	114 min

Nearby

Mesoscale Discussions in Louisiana, 2004 Every mesoscale discussion in 2004

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.