Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 716

April 30, 200514 parishes in Louisiana; 26 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2005, 1:08 AM CDT for 14 parishes in Louisiana; 26 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 30, 2005, 1:08 AM CDT (06:08 UTC)
Expired
Apr 30, 2005, 3:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 40 counties

Avoyelles Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson 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, 6.1 hours before the alert went out and 121 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 2005-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 522 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 2005-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.1939587897Sfc1 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
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.

IssuedProductOfficeCountiesLasted
Apr 29, 8:53 PM CDTMesoscale DiscussionSPCEast Carroll, Franklin, Madison, Richland, Tensas, West Carroll97 min
Apr 29, 9:45 PM CDTTornado WatchSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 9 more7 hr
Apr 29, 10:55 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more2 hr
Apr 30, 1:39 AM CDTMesoscale DiscussionSPCCaldwell, Catahoula, East Carroll, Franklin, Grant, LaSalle and 7 more96 min
Apr 30, 2:40 AM CDTTornado WatchSPCEast Feliciana, Pointe Coupee, Saint Helena, Washington, West Feliciana7 hr
Apr 30, 4:42 AM CDTMesoscale DiscussionSPCEast Feliciana, Jefferson, Lafourche, Orleans, Pointe Coupee, Saint Bernard and 8 more93 min
Apr 30, 5:05 AM CDTTornado WatchSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles7 hr
Apr 30, 6:41 AM CDTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles94 min
Apr 30, 11:02 AM CDTMesoscale DiscussionSPCAscension, Assumption, Iberia, Iberville, Jefferson, Lafourche and 10 more58 min
Apr 29, 9:23 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall97 min
Apr 30, 2:25 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall95 min

Nearby

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