Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 119

January 31, 200811 parishes in Louisiana; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 31, 2008, 3:25 PM CST for 11 parishes in Louisiana; 7 counties in Mississippi. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jan 31, 2008, 3:25 PM CST (21:25 UTC)
Expired: Jan 31, 2008, 5:00 PM CST
In force: 95 min
Issued by: the Storm Prediction Center

Counties Ascension Parish, LA, Assumption Parish, LA, Livingston Parish, LA, Orleans 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, Washington Parish, LA, Forrest County, MS, George County, MS, 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, 9.4 hours before the alert went out and 12 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: 794 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 296 m²/s²
0-3 km storm-relative helicity: 357 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
Jan 30, 11:47 PM CST	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Sabine	2 hr
Jan 31, 5:23 AM CST	Mesoscale Discussion	SPC	Beauregard, Calcasieu, Cameron	3 hr
Jan 31, 5:51 AM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more	7 hr
Jan 31, 9:57 AM CST	Mesoscale Discussion	SPC	Cameron	2 hr
Jan 31, 12:06 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 15 more	54 min
Jan 31, 12:35 PM CST	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 22 more	6 hr

Nearby

Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Mississippi, 2008 Every mesoscale discussion in 2008

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.