Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 2140

October 18, 20069 parishes in Louisiana; 19 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2006, 11:52 PM CDT for 9 parishes in Louisiana; 19 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Oct 18, 2006, 11:52 PM CDT (04:52 UTC)
Expired: Oct 19, 2006, 1:45 AM CDT
In force: 113 min
Issued by: the Storm Prediction Center

All 28 counties

Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fort Bend County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Victoria County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 69 km from the middle of the area, began a volume at 04:52 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 00:00Z, 4.9 hours before the alert went out and 133 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: 1015 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 579 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.3

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
Oct 19, 3:03 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 21 more	117 min
Oct 19, 6:11 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 26 more	94 min
Oct 19, 6:31 AM CDT	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 25 more	7 hr
Oct 19, 10:12 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 14 more	2 hr
Oct 19, 12:08 PM CDT	Mesoscale Discussion	SPC	Orleans, Saint Bernard, Saint Charles, Saint John the Baptist, Saint Tammany	2 hr
Oct 19, 1:16 PM CDT	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more	59 min
Oct 18, 8:01 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Brazos, Burleson, Falls, Freestone and 11 more	59 min

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.