Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 335

March 22, 200520 parishes in Louisiana; 14 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2005, 5:59 AM CST for 20 parishes in Louisiana; 14 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 22, 2005, 5:59 AM CST (11:59 UTC)
Expired: Mar 22, 2005, 8:00 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 34 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Jefferson County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Warren County, MS, Wilkinson County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 141 km from the middle of the area, began a volume at 11:59 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 nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 12.0 hours before the alert went out and 136 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: 18 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1125 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 140 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
Mar 21, 8:29 PM CST	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 4 more	91 min
Mar 21, 9:20 PM CST	Tornado Watch	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 15 more	7 hr
Mar 21, 11:09 PM CST	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto	96 min
Mar 21, 11:26 PM CST	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, Franklin and 14 more	94 min
Mar 22, 12:50 AM CST	Tornado Watch	SPC	De Soto, Sabine	5 hr
Mar 22, 1:45 AM CST	Tornado Watch	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 14 more	6 hr
Mar 22, 3:00 AM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 13 more	5 hr
Mar 22, 3:43 AM CST	Mesoscale Discussion	SPC	De Soto, Sabine	2 hr
Mar 22, 3:57 AM CST	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 14 more	2 hr
Mar 22, 6:55 AM CST	Tornado Watch	SPC	Saint Tammany, Washington	6 hr
Mar 22, 9:44 AM CST	Mesoscale Discussion	SPC	George, Greene, Hancock, Harrison, Jackson	61 min
Mar 22, 11:55 AM CST	Mesoscale Discussion	SPC	Benton, Bolivar, Carroll, Coahoma, DeSoto, Grenada and 11 more	95 min
Mar 22, 12:55 PM CST	Severe Thunderstorm Watch	SPC	Attala, Bolivar, Calhoun, Carroll, Choctaw, Coahoma and 20 more	7 hr
Mar 22, 2:39 PM CST	Mesoscale Discussion	SPC	Coahoma, DeSoto, Lafayette, Marshall, Panola, Quitman and 2 more	96 min
Mar 22, 3:43 PM CST	Mesoscale Discussion	SPC	Amite, Attala, Clarke, Covington, Forrest, Greene and 23 more	2 hr
Mar 22, 4:27 PM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Marshall, Tippah	33 min
Mar 22, 4:50 PM CST	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Itawamba, Lee, Pontotoc, Prentiss and 3 more	5 hr

Nearby

Mesoscale Discussions in Louisiana, 2005 Mesoscale Discussions in Mississippi, 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.