Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 2453

November 24, 200415 parishes in Louisiana; 20 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 24, 2004, 1:28 AM CST for 15 parishes in Louisiana; 20 counties in Mississippi. It was in force for 32 min.

The area

The outline as issued.

The facts

Issued
Nov 24, 2004, 1:28 AM CST (07:28 UTC)
Expired
Nov 24, 2004, 2:00 AM CST
In force
32 min
Issued by
the Storm Prediction Center
All 35 counties

Avoyelles Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Neshoba County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Warren County, MS, Wilkinson County, MS, Yazoo County, MS

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, 7.5 hours before the alert went out and 161 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 2004-11-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1370 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 2004-11-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 185 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
1370 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
857 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
185 m²/s²
0-3 km storm-relative helicity
198 m²/s²
Significant tornado parameter
1.9
Supercell composite
6.1

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
Nov 23, 7:50 PM CSTTornado WatchSPCSabine6 hr
Nov 23, 7:53 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 20 more37 min
Nov 23, 8:15 PM CSTTornado WatchSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 21 more6 hr
Nov 23, 9:14 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Catahoula, Concordia, East Carroll and 7 more2 hr
Nov 23, 10:01 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 38 more119 min
Nov 23, 11:00 PM CSTSevere Thunderstorm WatchSPCAcadia, Ascension, Assumption, Calcasieu, Cameron, Iberia and 15 more7 hr
Nov 24, 12:30 AM CSTMesoscale DiscussionSPCSaint Tammany, Tangipahoa, Washington30 min
Nov 24, 12:45 AM CSTTornado WatchSPCSaint Helena, Tangipahoa, Washington5 hr
Nov 24, 1:45 AM CSTTornado WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 2 more4 hr
Nov 24, 2:43 AM CSTMesoscale DiscussionSPCTangipahoa, Washington62 min
Nov 24, 2:50 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 11 more3 hr
Nov 24, 5:35 AM CSTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard25 min
Nov 24, 5:55 AM CSTTornado WatchSPCPlaquemines, Saint Bernard2 hr
Nov 23, 6:35 PM CSTTornado WatchSPCAlcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 28 more7 hr
Nov 23, 9:00 PM CSTMesoscale DiscussionSPCAlcorn, Itawamba, Prentiss, Tishomingo2 hr
Nov 23, 9:20 PM CSTTornado WatchSPCItawamba, Lowndes, Monroe, Tishomingo7 hr
Nov 24, 3:35 AM CSTMesoscale DiscussionSPCLowndes25 min
Nov 24, 4:57 AM CSTMesoscale DiscussionSPCClarke, Forrest, George, Greene, Lamar, Pearl River and 3 more63 min
Nov 24, 5:20 AM CSTTornado WatchSPCGeorge, Jackson6 hr
Nov 24, 10:16 AM CSTMesoscale DiscussionSPCAlcorn, Benton, Lafayette, Marshall, Prentiss, Tippah and 1 more2 hr

Nearby

Mesoscale Discussions in Mississippi, 2004Mesoscale Discussions in Louisiana, 2004Every 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.