Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 46

January 10, 20089 parishes in Louisiana; 26 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2008, 10:11 AM CST for 9 parishes in Louisiana; 26 counties in Mississippi. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jan 10, 2008, 10:11 AM CST (16:11 UTC)
Expired: Jan 10, 2008, 11:15 AM CST
In force: 64 min
Issued by: the Storm Prediction Center

All 35 counties

Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Greene 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, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS

The watches that followed

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

Tornado Watch 17Jan 10, 11:35 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 4.2 hours before the alert went out and 108 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: 315 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 592 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

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
Jan 10, 3:25 AM CST	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, East Carroll and 10 more	2 hr
Jan 10, 7:17 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 43 more	118 min
Jan 10, 7:46 AM CST	Tornado Watch	SPC	Avoyelles, Catahoula, Concordia, East Baton Rouge, East Carroll, East Feliciana and 14 more	8 hr
Jan 10, 11:33 AM CST	Tornado Watch PDS	SPC	Ascension, Assumption, Iberville, Jefferson, Lafourche, Orleans and 7 more	9 hr
Jan 10, 12:09 PM CST	Mesoscale Discussion	SPC	Avoyelles, Concordia, East Baton Rouge, East Feliciana, Livingston, Pointe Coupee and 6 more	96 min
Jan 10, 1:42 PM CST	Mesoscale Discussion	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 7 more	93 min
Jan 10, 3:42 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Orleans and 8 more	93 min
Jan 10, 5:25 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 9 more	95 min
Jan 10, 9:23 AM CST	Mesoscale Discussion	SPC	Alcorn, Calhoun, Chickasaw, Choctaw, Clay, Itawamba and 13 more	67 min
Jan 10, 3:05 PM CST	Mesoscale Discussion	SPC	Clarke, Covington, Forrest, Greene, Jasper, Jefferson Davis and 14 more	115 min

Nearby

Mesoscale Discussions in Mississippi, 2008 Mesoscale Discussions in Louisiana, 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.