Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 212

March 9, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Mar 9, 2011, 6:28 AM CST for 4 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Mar 9, 2011, 6:28 AM CST (12:28 UTC)
Expired: Mar 9, 2011, 8:00 AM CST
In force: 92 min
Issued by: the Storm Prediction Center

All 97 counties

Choctaw County, AL, Mobile County, AL, Washington County, AL, Ashley County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Orleans Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Issaquena County, MS, Jackson County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Wilkinson County, MS, Yazoo County, MS

The watches that followed

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

Tornado Watch 46Mar 9, 7:25 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 0.5 hours before the alert went out and 151 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: 898 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -132 m²/s²
0-3 km storm-relative helicity: -197 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 8, 7:37 PM CST	Tornado Watch	SPC	Choctaw, Mobile, Washington	7 hr
Mar 9, 1:28 AM CST	Mesoscale Discussion	SPC	Choctaw, Mobile, Washington	92 min
Mar 9, 2:39 AM CST	Tornado Watch	SPC	Baldwin, Choctaw, Clarke, Mobile, Monroe, Washington and 1 more	5 hr
Mar 9, 7:26 AM CST	Tornado Watch	SPC	Baldwin, Butler, Conecuh, Covington, Crenshaw, Escambia and 2 more	6 hr
Mar 9, 8:32 AM CST	Mesoscale Discussion	SPC	Coffee, Dale, Geneva, Henry, Houston	28 min
Mar 9, 8:39 AM CST	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	7 hr
Mar 9, 9:31 AM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 7 more	59 min
Mar 8, 6:27 PM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Columbia, Hempstead, Howard, Lafayette and 6 more	63 min
Mar 8, 9:40 PM CST	Mesoscale Discussion	SPC	Columbia, Lafayette, Union	65 min
Mar 9, 4:39 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Orleans and 9 more	66 min

Nearby

Mesoscale Discussions in Louisiana, 2011 Mesoscale Discussions in Mississippi, 2011 Mesoscale Discussions in Alabama, 2011 Every mesoscale discussion in 2011

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.