Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 289

April 7, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2004, 9:59 PM CDT for 4 states. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Apr 7, 2004, 9:59 PM CDT (02:59 UTC)
Expired: Apr 7, 2004, 11:00 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

All 55 counties

Ashley County, AR, Chicot County, AR, Drew County, AR, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Tensas Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Wilkinson County, MS, Yazoo County, MS, Jasper County, TX, Newton County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.0 hours before the alert went out and 195 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: 825 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1551 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

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
Apr 7, 7:20 PM CDT	Severe Thunderstorm Watch	SPC	Ashley, Bradley, Calhoun, Chicot, Drew, Union	6 hr
Apr 7, 11:43 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Catahoula, Concordia, East Feliciana and 5 more	62 min
Apr 7, 8:22 PM CDT	Mesoscale Discussion	SPC	Attala, Bolivar, Carroll, Choctaw, Clay, Grenada and 21 more	53 min
Apr 8, 1:31 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Castro, Cochran, Dawson, Deaf Smith and 14 more	119 min
Apr 8, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	Bailey, Castro, Cochran, Deaf Smith, Gaines, Hockley and 7 more	6 hr
Apr 8, 4:44 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Castro, Cochran, Deaf Smith, Gaines and 8 more	91 min
Apr 8, 5:45 PM CDT	Mesoscale Discussion	SPC	Bandera, Brooks, Crockett, Dimmit, Duval, Edwards and 22 more	90 min
Apr 8, 6:15 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Briscoe, Carson, Collingsworth, Crosby, Dickens and 12 more	6 hr

Nearby

Mesoscale Discussions in Mississippi, 2004 Mesoscale Discussions in Louisiana, 2004 Mesoscale Discussions in Arkansas, 2004 Every mesoscale discussion in 2004

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.