Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 471

March 31, 200535 parishes in Louisiana; 40 counties in Mississippi; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2005, 10:53 PM CST for 35 parishes in Louisiana; 40 counties in Mississippi; 8 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Mar 31, 2005, 10:53 PM CST (04:53 UTC)
Expired
Apr 1, 2005, 12:00 AM CST
In force
67 min
Issued by
the Storm Prediction Center
All 83 counties

Avoyelles Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline 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, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, Washington Parish, LA, Webster Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hinds County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Wilkinson County, MS, Yazoo County, MS, Angelina County, TX, Jasper County, TX, Newton County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX

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 00:00Z, 4.9 hours before the alert went out and 171 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-pSkew-T log-p diagram, Jackson, MS at 00:00Z on 2005-04-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 98 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2005-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
98 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
1744 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
239 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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.

IssuedProductOfficeCountiesLasted
Mar 31, 6:49 PM CSTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Bienville, Bossier, Caddo and 16 more56 min
Mar 31, 7:05 PM CSTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 17 more5 hr
Mar 31, 8:25 PM CSTMesoscale DiscussionSPCAcadia, Calcasieu, Cameron, Jefferson Davis, Vermilion65 min
Mar 31, 8:45 PM CSTSevere Thunderstorm WatchSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 4 more7 hr
Mar 31, 8:59 PM CSTMesoscale DiscussionSPCAscension, Catahoula, Concordia, East Baton Rouge, East Feliciana, Iberville and 8 more61 min
Mar 31, 9:27 PM CSTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 15 more63 min
Mar 31, 11:15 PM CSTTornado WatchSPCAvoyelles, Bienville, Caldwell, Catahoula, Claiborne, Concordia and 27 more8 hr
Apr 1, 12:25 AM CSTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis and 3 more95 min
Apr 1, 1:29 AM CSTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Tammany2 hr
Apr 1, 2:05 AM CSTTornado WatchSPCOrleans, Saint Bernard, Saint Tammany, Washington5 hr
Apr 1, 4:14 AM CSTMesoscale DiscussionSPCSaint Helena, Tangipahoa, Washington2 hr
Apr 1, 11:16 AM CSTMesoscale DiscussionSPCAlcorn, Benton, Itawamba, Lee, Pontotoc, Prentiss and 3 more2 hr
Apr 1, 11:20 AM CSTMesoscale DiscussionSPCClarke, Jasper, Jones, Kemper, Lauderdale, Lowndes and 9 more115 min
Apr 1, 11:45 AM CSTSevere Thunderstorm WatchSPCAlcorn, Chickasaw, Clay, Itawamba, Kemper, Lauderdale and 10 more6 hr
Apr 1, 3:19 PM CSTMesoscale DiscussionSPCGeorge, Greene, Perry, Stone, Wayne116 min
Mar 31, 7:07 PM CSTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Cherokee, Delta and 28 more113 min

Nearby

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