Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 2428

December 9, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Dec 9, 2008, 2:18 PM CST for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Dec 9, 2008, 2:18 PM CST (20:18 UTC)
Expired: Dec 9, 2008, 3:45 PM CST
In force: 87 min
Issued by: the Storm Prediction Center

All 106 counties

Chicot County, AR, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin 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, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Orleans Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland 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 Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lafayette County, MS, Lamar County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Oktibbeha County, MS, Pearl River County, MS, Pike County, MS, Pontotoc County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Hardin County, TX, Jasper County, TX, Newton County, TX, Orange County, TX

The radar

The Jackson/Brandon,MS radar (KDGX), 141 km from the middle of the area, began a volume at 20:18 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

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

Tornado Watch 946Dec 9, 3:50 PM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.3 hours before the alert went out and 135 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: 587 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 445 m²/s²
0-3 km storm-relative helicity: 522 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
Dec 8, 11:31 PM CST	Tornado Watch	SPC	Little River, Miller	7 hr
Dec 9, 12:10 AM CST	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Madison, Marion, Newton and 1 more	35 min
Dec 9, 12:22 AM CST	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 24 more	4 hr
Dec 9, 1:20 AM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more	25 min
Dec 9, 2:17 AM CST	Mesoscale Discussion	SPC	Little River, Miller	58 min
Dec 9, 3:41 AM CST	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 36 more	64 min
Dec 9, 4:11 AM CST	Tornado Watch	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 25 more	7 hr
Dec 9, 7:41 AM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 21 more	64 min
Dec 9, 9:32 AM CST	Tornado Watch	SPC	Ashley, Bradley, Chicot, Desha, Drew, Union	6 hr
Dec 9, 10:12 AM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 10 more	93 min
Dec 9, 3:51 PM CST	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 35 more	9 hr
Dec 9, 5:52 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Avoyelles, Catahoula, Concordia and 18 more	83 min
Dec 8, 7:10 PM CST	Mesoscale Discussion	SPC	Bosque, Collin, Comanche, Cooke, Dallas, Denton and 14 more	2 hr
Dec 8, 9:37 PM CST	Severe Thunderstorm Watch	SPC	Anderson, Bosque, Camp, Cherokee, Collin, Cooke and 36 more	5 hr
Dec 8, 11:14 PM CST	Mesoscale Discussion	SPC	Anderson, Camp, Delta, Franklin, Freestone, Henderson and 16 more	91 min
Dec 9, 2:30 AM CST	Mesoscale Discussion	SPC	Bosque, Collin, Dallas, Grayson	30 min

Nearby

Mesoscale Discussions in Mississippi, 2008 Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Texas, 2008 Every mesoscale discussion in 2008

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; radar from the NEXRAD Level II archive.