Alert archive / Louisiana / Mesoscale Discussions in 2004

Mesoscale Discussion 2397

November 2, 200418 parishes in Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 2, 2004, 9:52 AM CST for 18 parishes in Louisiana; 5 counties in Mississippi. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Nov 2, 2004, 9:52 AM CST (15:52 UTC)
Expired: Nov 2, 2004, 11:45 AM CST
In force: 113 min
Issued by: the Storm Prediction Center

All 23 counties

Ascension Parish, LA, Assumption Parish, LA, Iberia Parish, LA, Iberville 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 Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.9 hours before the alert went out and 99 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: 1756 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 7.5

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 1, 6:34 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Caldwell, Cameron, Catahoula and 16 more	116 min
Nov 1, 9:37 PM CST	Mesoscale Discussion	SPC	Calcasieu, Cameron	3 hr
Nov 2, 3:30 AM CST	Mesoscale Discussion	SPC	Acadia, East Baton Rouge, East Feliciana, Iberville, Lafayette, Pointe Coupee and 4 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 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.