Alert archive / Louisiana / Mesoscale Discussions in 2007

Mesoscale Discussion 442

April 10, 200728 parishes in Louisiana; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2007, 9:46 AM CDT for 28 parishes in Louisiana; 6 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2007, 9:46 AM CDT (14:46 UTC)
Expired: Apr 10, 2007, 11:45 AM CDT
In force: 119 min
Issued by: the Storm Prediction Center

All 34 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Sabine County, TX

The radar

The Lake Charles radar (KLCH), 49 km from the middle of the area, began a volume at 14:47 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 2.8 hours before the alert went out and 48 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 290 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 470 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 352 m²/s²
0-3 km storm-relative helicity: 483 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.2

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.

Issued	Product	Office	Counties	Lasted
Apr 10, 2:52 PM CDT	Mesoscale Discussion	SPC	Childress, Collingsworth, Donley, Hardeman, Wheeler, Wichita and 1 more	83 min
Apr 10, 3:40 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Cooke, Foard, Grayson and 5 more	6 hr

Nearby

Mesoscale Discussions in Louisiana, 2007 Mesoscale Discussions in Texas, 2007 Every 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; radar from the NEXRAD Level II archive.