Alert archive / Louisiana / Mesoscale Discussions in 2004

Mesoscale Discussion 31

January 25, 200421 parishes in Louisiana; Wilkinson County, Mississippi; Jefferson County, Orange County, Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 25, 2004, 1:11 AM CST for 21 parishes in Louisiana; Wilkinson County, Mississippi; Jefferson County, Orange County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 25, 2004, 1:11 AM CST (07:11 UTC)
Expired: Jan 25, 2004, 3:15 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 24 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Wilkinson County, MS, Jefferson County, TX, Orange County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 7.2 hours before the alert went out and 60 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: 78 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 558 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 24, 10:46 PM CST	Mesoscale Discussion	SPC	Sabine	89 min
Jan 25, 10:08 AM CST	Mesoscale Discussion	SPC	Jefferson, Orleans, Saint Bernard	3 hr
Jan 24, 7:56 PM CST	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 22 more	94 min

Nearby

Mesoscale Discussions in Louisiana, 2004 Mesoscale Discussions in Texas, 2004 Mesoscale Discussions in Mississippi, 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.