Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 718

April 30, 200515 counties in Alabama; 13 parishes in Louisiana; 51 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2005, 1:39 AM CDT for 15 counties in Alabama; 13 parishes in Louisiana; 51 counties in Mississippi. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2005, 1:39 AM CDT (06:39 UTC)
Expired: Apr 30, 2005, 3:15 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 79 counties

Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Morgan County, AL, Pickens County, AL, Walker County, AL, Winston County, AL, Caldwell Parish, LA, Catahoula Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Alcorn 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, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jefferson County, MS, Kemper County, MS, Lafayette County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 72 km from the middle of the area, began a volume at 06:40 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 214Apr 30, 2:40 AM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 6.7 hours before the alert went out and 72 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: 522 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1448 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 333 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.4

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 29, 8:53 PM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 26 more	97 min
Apr 29, 9:45 PM CDT	Tornado Watch	SPC	Colbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more	7 hr
Apr 30, 2:40 AM CDT	Tornado Watch	SPC	Bibb, Blount, Calhoun, Cherokee, Choctaw, Cullman and 16 more	7 hr
Apr 30, 4:42 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Blount, Bullock, Butler and 43 more	93 min
Apr 30, 5:05 AM CDT	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Chambers and 25 more	7 hr
Apr 30, 6:41 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Chambers and 29 more	94 min
Apr 30, 7:10 AM CDT	Severe Thunderstorm Watch	SPC	Dale, Geneva, Henry, Houston	6 hr
Apr 30, 11:02 AM CDT	Mesoscale Discussion	SPC	Baldwin, Covington, Escambia, Mobile	58 min
Apr 29, 10:55 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more	2 hr
Apr 30, 1:08 AM CDT	Mesoscale Discussion	SPC	Avoyelles, Concordia, East Baton Rouge, East Feliciana, Iberville, Livingston and 8 more	2 hr
Apr 29, 9:23 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Marshall	97 min
Apr 30, 2:25 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Marshall	95 min

Nearby

Mesoscale Discussions in Mississippi, 2005 Mesoscale Discussions in Alabama, 2005 Mesoscale Discussions in Louisiana, 2005 Every mesoscale discussion in 2005

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.