Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 774

May 2, 200829 parishes in Louisiana; 30 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 2, 2008, 2:21 PM CDT for 29 parishes in Louisiana; 30 counties in Mississippi. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: May 2, 2008, 2:21 PM CDT (19:21 UTC)
Expired: May 2, 2008, 4:15 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center

All 59 counties

Ascension Parish, LA, Assumption Parish, LA, Avoyelles 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, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Madison Parish, LA, Orleans Parish, LA, Pointe Coupee 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, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Issaquena 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, Pearl River County, MS, Pike County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Warren 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.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 7.4 hours before the alert went out and 132 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: 1080 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 323 m²/s²
0-3 km storm-relative helicity: 393 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 9.2

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
May 2, 8:49 AM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more	6 hr
May 2, 12:12 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caldwell, Claiborne, East Carroll, Jackson and 8 more	2 hr
May 2, 5:18 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more	6 hr
May 2, 1:54 PM CDT	Tornado Watch	SPC	Alcorn, Benton, Bolivar, Calhoun, Coahoma, DeSoto and 15 more	6 hr
May 2, 3:35 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 23 more	85 min
May 2, 4:43 PM CDT	Tornado Watch	SPC	Attala, Carroll, Chickasaw, Choctaw, Clay, Holmes and 16 more	7 hr

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.