Alert archive / Louisiana / Mesoscale Discussions in 2006

Mesoscale Discussion 330

March 20, 20066 parishes in Louisiana; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 20, 2006, 6:36 AM CST for 6 parishes in Louisiana; 4 counties in Texas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Mar 20, 2006, 6:36 AM CST (12:36 UTC)
Expired: Mar 20, 2006, 7:30 AM CST
In force: 54 min
Issued by: the Storm Prediction Center

Counties Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Evangeline Parish, LA, Rapides Parish, LA, Vernon Parish, LA, Jasper County, TX, Newton County, TX, Sabine County, TX, San Augustine County, TX

The watches that followed

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

Tornado Watch 102Mar 20, 9:50 AM CST

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.6 hours before the alert went out and 72 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: 175 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 896 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 216 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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
Mar 20, 3:36 AM CST	Mesoscale Discussion	SPC	Beauregard, Calcasieu	24 min
Mar 20, 4:21 AM CST	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Calcasieu, Evangeline, Grant and 6 more	24 min
Mar 20, 4:44 AM CST	Tornado Watch	SPC	Allen, Avoyelles, Beauregard, Evangeline, Rapides, Saint Landry and 1 more	5 hr
Mar 20, 9:20 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Concordia and 12 more	85 min
Mar 20, 9:53 AM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Catahoula and 19 more	7 hr
Mar 20, 2:12 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Catahoula and 19 more	93 min
Mar 20, 3:09 PM CST	Tornado Watch	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 6 more	7 hr
Mar 19, 6:09 PM CST	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Castro, Cochran, Crane, Deaf Smith and 12 more	7 hr
Mar 19, 8:34 PM CST	Tornado Watch	SPC	Atascosa, Austin, Bandera, Bastrop, Bell, Bexar and 39 more	7 hr
Mar 19, 8:54 PM CST	Mesoscale Discussion	SPC	Andrews, Bailey, Castro, Cochran, Crosby, Dawson and 17 more	2 hr
Mar 19, 9:48 PM CST	Severe Thunderstorm Watch	SPC	Baylor, Borden, Briscoe, Callahan, Childress, Coke and 33 more	5 hr
Mar 19, 10:32 PM CST	Mesoscale Discussion	SPC	Atascosa, Austin, Bandera, Bastrop, Bexar, Brazos and 28 more	118 min
Mar 19, 11:37 PM CST	Mesoscale Discussion	SPC	Atascosa, Austin, Bandera, Bastrop, Bexar, Brazos and 28 more	83 min
Mar 20, 1:26 AM CST	Mesoscale Discussion	SPC	Angelina, Aransas, Atascosa, Austin, Bastrop, Bee and 59 more	64 min
Mar 20, 2:08 AM CST	Mesoscale Discussion	SPC	Baylor, Callahan, Childress, Coke, Coleman, Cottle and 17 more	67 min
Mar 20, 12:47 PM CST	Mesoscale Discussion	SPC	Clay, Hardeman, Montague, Wichita, Wilbarger	88 min

Nearby

Mesoscale Discussions in Louisiana, 2006 Mesoscale Discussions in Texas, 2006 Every mesoscale discussion in 2006

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.