Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 1985

December 23, 20145 counties in Alabama; 41 parishes in Louisiana; 36 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2014, 11:33 AM CST for 5 counties in Alabama; 41 parishes in Louisiana; 36 counties in Mississippi. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Dec 23, 2014, 11:33 AM CST (17:33 UTC)
Expired: Dec 23, 2014, 1:00 PM CST
In force: 87 min
Issued by: the Storm Prediction Center

All 82 counties

Choctaw County, AL, Greene County, AL, Mobile County, AL, Sumter County, AL, Washington County, AL, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Rapides 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, St. Mary Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vermilion 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, 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, Jackson County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale 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, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.6 hours before the alert went out and 179 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: 1212 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 831 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.1

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
Dec 23, 3:45 AM CST	Mesoscale Discussion	SPC	Baldwin	2 hr
Dec 23, 7:39 AM CST	Mesoscale Discussion	SPC	Choctaw, Greene, Pickens, Sumter	3 hr
Dec 23, 7:40 AM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 8 more	2 hr
Dec 23, 9:30 AM CST	Tornado Watch	SPC	Baldwin, Choctaw, Mobile, Washington	11 hr
Dec 23, 2:06 PM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 32 more	114 min
Dec 23, 2:47 PM CST	Tornado Watch	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 34 more	8 hr
Dec 23, 2:57 PM CST	Mesoscale Discussion	SPC	Choctaw, Greene, Mobile, Sumter, Washington	93 min
Dec 23, 4:59 PM CST	Mesoscale Discussion	SPC	Baldwin, Mobile, Washington	61 min
Dec 23, 4:19 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 20 more	116 min

Nearby

Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Mississippi, 2014 Mesoscale Discussions in Alabama, 2014 Every mesoscale discussion in 2014

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.