Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 671

May 3, 200710 parishes in Louisiana; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 3, 2007, 6:34 PM CDT for 10 parishes in Louisiana; 25 counties in Texas. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: May 3, 2007, 6:34 PM CDT (23:34 UTC)
Expired: May 3, 2007, 8:30 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 35 counties

Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, Natchitoches Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Brazos County, TX, Burleson County, TX, Chambers County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX

The radar

The Houston radar (KHGX), 152 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 167 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1590 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -122 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 2, 7:24 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more	96 min
May 2, 7:59 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Grant and 7 more	7 hr
May 2, 11:09 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 4 more	96 min
May 3, 1:21 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Grant and 8 more	84 min
May 3, 11:27 AM CDT	Severe Thunderstorm Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 14 more	4 hr
May 3, 3:08 PM CDT	Tornado Watch	SPC	Allen, Beauregard, Calcasieu, Cameron, De Soto, Grant and 6 more	7 hr
May 3, 4:46 PM CDT	Mesoscale Discussion	SPC	East Carroll, Madison, Morehouse, Richland, West Carroll	59 min
May 3, 5:38 PM CDT	Tornado Watch	SPC	East Carroll	3 hr
May 3, 6:27 PM CDT	Tornado Watch	SPC	Avoyelles, Caldwell, Catahoula, Concordia, Franklin, LaSalle and 3 more	4 hr
May 2, 9:10 PM CDT	Mesoscale Discussion	SPC	Brewster, Crane, Pecos, Reeves, Terrell, Ward	65 min
May 2, 9:30 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Collin, Cooke, Coryell and 33 more	60 min
May 2, 9:57 PM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Brazoria, Calhoun, Chambers, Fort Bend and 21 more	63 min
May 2, 10:19 PM CDT	Severe Thunderstorm Watch	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 16 more	6 hr
May 2, 10:48 PM CDT	Tornado Watch	SPC	Aransas, Bee, Brooks, Calhoun, Cameron, DeWitt and 17 more	5 hr
May 2, 11:48 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 13 more	87 min
May 3, 12:01 AM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 13 more	89 min
May 3, 1:52 AM CDT	Mesoscale Discussion	SPC	Cameron, Kenedy, Willacy	83 min
May 3, 12:08 PM CDT	Mesoscale Discussion	SPC	Bosque, Burnet, Coryell, Hamilton, Hood, Johnson and 7 more	97 min
May 3, 2:19 PM CDT	Mesoscale Discussion	SPC	Austin, Chambers, Colorado, Fort Bend, Hardin, Harris and 10 more	86 min
May 3, 6:49 PM CDT	Mesoscale Discussion	SPC	Bosque, Dallas, Hamilton, Johnson	56 min

Nearby

Mesoscale Discussions in Texas, 2007 Mesoscale Discussions in Louisiana, 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.