Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 247

February 16, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Feb 16, 2008, 10:41 PM CST for 4 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Feb 16, 2008, 10:41 PM CST (04:41 UTC)
Expired
Feb 17, 2008, 12:15 AM CST
In force
94 min
Issued by
the Storm Prediction Center
All 41 counties

Ashley County, AR, Bradley County, AR, Chicot County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette 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, Richland Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Issaquena County, MS, Washington County, MS, Jefferson County, TX, Orange 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.7 hours before the alert went out and 101 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 00:00Z on 2008-02-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 188 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 00:00Z on 2008-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 354 square meters per square second.1939587897117Sfc1 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
188 J/kg
Mixed-layer CIN
-263 J/kg
Mixed-layer LCL
634 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
354 m²/s²
0-3 km storm-relative helicity
445 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.7

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 16, 11:30 PM CSTSevere Thunderstorm WatchSPCAshley, Chicot6 hr
Feb 16, 7:18 PM CSTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Cameron, De Soto, Jefferson Davis and 4 more87 min
Feb 16, 8:25 PM CSTTornado WatchSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 4 more6 hr
Feb 17, 1:33 AM CSTMesoscale DiscussionSPCAcadia, Allen, Cameron, Evangeline, Jefferson Davis, Rapides and 1 more57 min
Feb 17, 2:13 AM CSTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more32 min
Feb 17, 2:45 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more5 hr
Feb 17, 7:13 AM CSTMesoscale DiscussionSPCJefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany62 min
Feb 17, 4:19 AM CSTMesoscale DiscussionSPCAlcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 34 more56 min
Feb 17, 5:05 AM CSTMesoscale DiscussionSPCClarke, George, Greene, Harrison, Jackson, Lauderdale and 3 more55 min
Feb 17, 5:26 AM CSTTornado WatchSPCGeorge, Greene, Perry, Stone, Wayne7 hr
Feb 17, 9:43 AM CSTMesoscale DiscussionSPCClarke, George, Greene, Harrison, Jackson, Perry and 2 more62 min
Feb 16, 6:48 PM CSTMesoscale DiscussionSPCAransas, Bee, Brooks, Cameron, Duval, Hidalgo and 11 more57 min

Nearby

Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Arkansas, 2008Mesoscale Discussions in Mississippi, 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.