Alert archive / Mississippi / Mesoscale Discussions in 2006

Mesoscale Discussion 334

March 20, 200625 parishes in Louisiana; 26 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 20, 2006, 2:12 PM CST for 25 parishes in Louisiana; 26 counties in Mississippi. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Mar 20, 2006, 2:12 PM CST (20:12 UTC)
Expired: Mar 20, 2006, 3:45 PM CST
In force: 93 min
Issued by: the Storm Prediction Center

All 51 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hinds County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wilkinson County, MS

The watches that followed

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

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.2 hours before the alert went out and 185 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: 551 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 420 m²/s²
0-3 km storm-relative helicity: 432 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
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, 6:36 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Evangeline, Rapides, Vernon	54 min
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, 3:09 PM CST	Tornado Watch	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 6 more	7 hr
Mar 20, 5:47 PM CST	Mesoscale Discussion	SPC	George, Greene, Hancock, Harrison, Jackson, Pearl River and 2 more	118 min

Nearby

Mesoscale Discussions in Mississippi, 2006 Mesoscale Discussions in Louisiana, 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.