Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 209

February 12, 200833 parishes in Louisiana; 16 counties in Mississippi; Jefferson County, Orange County, Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 12, 2008, 12:40 PM CST for 33 parishes in Louisiana; 16 counties in Mississippi; Jefferson County, Orange County, Texas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Feb 12, 2008, 12:40 PM CST (18:40 UTC)
Expired
Feb 12, 2008, 1:45 PM CST
In force
65 min
Issued by
the Storm Prediction Center
All 51 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Covington County, MS, Forrest County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Jefferson County, TX, Orange County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.7 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, Lake Charles Mun, LA at 12:00Z on 2008-02-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 583 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 2008-02-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 175 square meters per square second.193958Sfc1 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
583 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
595 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
175 m²/s²
0-3 km storm-relative helicity
250 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

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.

IssuedProductOfficeCountiesLasted
Feb 12, 1:17 AM CSTMesoscale DiscussionSPCBossier, Caddo88 min
Feb 12, 7:50 AM CSTMesoscale DiscussionSPCBeauregard, Bienville, Claiborne, De Soto, Grant, Jackson and 7 more55 min
Feb 12, 9:53 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 33 more67 min
Feb 12, 10:25 AM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more7 hr
Feb 12, 2:19 PM CSTMesoscale DiscussionSPCAscension, Assumption, Iberia, Jefferson, Lafourche, Orleans and 11 more116 min
Feb 12, 12:12 PM CSTMesoscale DiscussionSPCClarke, George, Greene, Jackson, Lauderdale, Perry and 1 more2 hr
Feb 12, 12:34 PM CSTTornado WatchSPCClarke, George, Greene, Jackson, Jasper, Kemper and 9 more7 hr
Feb 11, 7:57 PM CSTSevere Thunderstorm WatchSPCCamp, Collin, Cooke, Dallas, Delta, Denton and 16 more6 hr
Feb 11, 9:48 PM CSTSevere Thunderstorm WatchSPCBowie, Cass4 hr
Feb 11, 10:51 PM CSTMesoscale DiscussionSPCCollin, Cooke, Delta, Denton, Fannin, Grayson and 7 more114 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.