Alert archive / Louisiana / Mesoscale Discussions in 2007

Mesoscale Discussion 2223

December 15, 200715 parishes in Louisiana; 6 counties in Mississippi; Newton County, Orange County, Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 15, 2007, 8:45 AM CST for 15 parishes in Louisiana; 6 counties in Mississippi; Newton County, Orange County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Dec 15, 2007, 8:45 AM CST (14:45 UTC)
Expired
Dec 15, 2007, 10:45 AM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 23 counties

Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Rapides Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Adams County, MS, Claiborne County, MS, Hinds County, MS, Jefferson County, MS, Warren County, MS, Wilkinson County, MS, Newton County, TX, Orange County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 2.8 hours before the alert went out and 168 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 2007-12-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 173 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 2007-12-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 234 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
173 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
530 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
234 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.5

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
Dec 15, 12:44 AM CSTMesoscale DiscussionSPCBriscoe, Crosby, Floyd, Hale, Hall, Hockley and 2 more4 hr
Dec 15, 1:30 AM CSTMesoscale DiscussionSPCAnderson, Angelina, Austin, Brazos, Burleson, Cherokee and 24 more90 min

Nearby

Mesoscale Discussions in Louisiana, 2007Mesoscale Discussions in Mississippi, 2007Mesoscale Discussions in Texas, 2007Every mesoscale discussion in 2007

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.