Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 283

March 13, 200525 parishes in Louisiana; 10 counties in Mississippi; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2005, 1:50 PM CST for 25 parishes in Louisiana; 10 counties in Mississippi; 7 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 13, 2005, 1:50 PM CST (19:50 UTC)
Expired: Mar 13, 2005, 4:15 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 42 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Claiborne County, MS, Copiah County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Madison County, MS, Rankin County, MS, Sharkey County, MS, Warren County, MS, Yazoo County, MS, Harrison County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The watches that followed

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

Severe Thunderstorm Watch 49Mar 13, 2:30 PM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.8 hours before the alert went out and 133 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: 6 J/kg
Mixed-layer CIN: -496 J/kg
Mixed-layer LCL: 1121 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 274 m²/s²
0-3 km storm-relative helicity: 384 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 13, 2:30 PM CST	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more	8 hr
Mar 13, 5:02 PM CST	Mesoscale Discussion	SPC	Sabine, Vernon	118 min
Mar 13, 2:13 PM CST	Mesoscale Discussion	SPC	Choctaw, Clay, Kemper, Leake, Lowndes, Neshoba and 3 more	2 hr

Nearby

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