Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 2009

August 3, 200812 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2008, 1:17 AM CDT for 12 parishes in Louisiana. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Aug 3, 2008, 1:17 AM CDT (06:17 UTC)
Expired: Aug 3, 2008, 2:15 AM CDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Avoyelles Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Winn Parish, LA

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 6.3 hours before the alert went out and 154 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: 395 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 2937 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 1 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
Aug 2, 7:52 PM CDT	Severe Thunderstorm Watch	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more	6 hr
Aug 2, 10:57 PM CDT	Mesoscale Discussion	SPC	East Carroll, Madison, Tensas, West Carroll	93 min
Aug 3, 10:50 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 21 more	55 min
Aug 3, 1:07 PM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 24 more	7 hr
Aug 3, 4:21 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 28 more	54 min
Aug 3, 6:44 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more	3 hr

Nearby

Mesoscale Discussions in Louisiana, 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.