Alert archive / Louisiana / Mesoscale Discussions in 2011

Mesoscale Discussion 2308

November 8, 20116 counties in Arkansas; 22 parishes in Louisiana; Bolivar County, Issaquena County, Washington County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 8, 2011, 9:21 PM CST for 6 counties in Arkansas; 22 parishes in Louisiana; Bolivar County, Issaquena County, Washington County, Mississippi. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Nov 8, 2011, 9:21 PM CST (03:21 UTC)
Expired: Nov 8, 2011, 10:45 PM CST
In force: 84 min
Issued by: the Storm Prediction Center

All 31 counties

Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Issaquena County, MS, Washington County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 3.4 hours before the alert went out and 216 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: 107 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1030 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Nov 8, 6:43 PM CST	Mesoscale Discussion	SPC	Craighead, Crittenden, Cross, Independence, Jackson, Lonoke and 6 more	62 min
Nov 8, 7:04 PM CST	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Faulkner, Greene and 13 more	2 hr
Nov 8, 11:18 PM CST	Mesoscale Discussion	SPC	Acadia, Avoyelles, Catahoula, Concordia, East Carroll, Evangeline and 10 more	57 min

Nearby

Mesoscale Discussions in Louisiana, 2011 Mesoscale Discussions in Arkansas, 2011 Mesoscale Discussions in Mississippi, 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.