Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 2399

November 28, 200813 parishes in Louisiana; 6 counties in Mississippi; Jasper County, Newton County, Sabine County, Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 28, 2008, 5:33 PM CST for 13 parishes in Louisiana; 6 counties in Mississippi; Jasper County, Newton County, Sabine County, Texas. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Nov 28, 2008, 5:33 PM CST (23:33 UTC)
Expired
Nov 28, 2008, 6:30 PM CST
In force
57 min
Issued by
the Storm Prediction Center
All 22 counties

Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Vernon Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Franklin County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS, Jasper County, TX, Newton County, TX, Sabine County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.6 hours before the alert went out and 131 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, Lake Charles Mun, LA at 12:00Z on 2008-11-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 277 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, Lake Charles Mun, LA at 12:00Z on 2008-11-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
277 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
534 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
138 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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 28, 11:56 AM CSTMesoscale DiscussionSPCAvoyelles, Catahoula, Concordia, Grant, LaSalle, Natchitoches and 4 more2 hr
Nov 28, 3:16 PM CSTMesoscale DiscussionSPCAvoyelles, Catahoula, Concordia, East Feliciana, Grant, LaSalle and 6 more119 min

Nearby

Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Mississippi, 2008Mesoscale Discussions in Texas, 2008Every mesoscale discussion in 2008

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.