Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 2297

December 21, 200633 parishes in Louisiana; 35 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 21, 2006, 4:56 PM CST for 33 parishes in Louisiana; 35 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Dec 21, 2006, 4:56 PM CST (22:56 UTC)
Expired: Dec 21, 2006, 6:30 PM CST
In force: 94 min
Issued by: the Storm Prediction Center

All 68 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, 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, Pointe Coupee Parish, LA, Rapides 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, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Angelina County, TX, Aransas County, TX, Austin County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Karnes County, TX, Lavaca County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Refugio County, TX, San Jacinto County, TX, San Patricio County, TX, Tyler County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 100 km from the middle of the area, began a volume at 22:56 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, 10.9 hours before the alert went out and 105 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: 329 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 450 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.6

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
Dec 21, 10:45 AM CST	Mesoscale Discussion	SPC	Jefferson, Orleans, Plaquemines, Saint Bernard	90 min
Dec 21, 2:22 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Beauregard, Calcasieu and 15 more	83 min
Dec 21, 2:28 PM CST	Severe Thunderstorm Watch	SPC	Acadia, Allen, Ascension, Assumption, Beauregard, Calcasieu and 21 more	8 hr
Dec 21, 8:53 AM CST	Mesoscale Discussion	SPC	Atascosa, Bastrop, Caldwell, Colorado, DeWitt, Fayette and 6 more	97 min
Dec 21, 11:53 AM CST	Mesoscale Discussion	SPC	Austin, Brazoria, Colorado, DeWitt, Fort Bend, Galveston and 9 more	67 min
Dec 21, 12:04 PM CST	Severe Thunderstorm Watch	SPC	Aransas, Austin, Bee, Brazoria, Calhoun, Colorado and 20 more	6 hr

Nearby

Mesoscale Discussions in Texas, 2006 Mesoscale Discussions in Louisiana, 2006 Every mesoscale discussion in 2006

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.