Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 930

May 30, 2007Beauregard Parish, Calcasieu Parish, Louisiana; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 30, 2007, 1:23 PM CDT for Beauregard Parish, Calcasieu Parish, Louisiana; 16 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 30, 2007, 1:23 PM CDT (18:23 UTC)
Expired: May 30, 2007, 3:00 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Beauregard Parish, LA, Calcasieu Parish, LA, Angelina County, TX, Chambers County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Liberty 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

The radar

The Lake Charles radar (KLCH), 134 km from the middle of the area, began a volume at 18:22 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, 6.4 hours before the alert went out and 136 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: 1253 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 98 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 30, 11:07 AM CDT	Mesoscale Discussion	SPC	Beauregard, Caddo, De Soto, Sabine	83 min
May 29, 7:53 PM CDT	Mesoscale Discussion	SPC	Bell, Brown, Burnet, Coleman, Coryell, Lampasas and 5 more	2 hr
May 29, 9:02 PM CDT	Mesoscale Discussion	SPC	Hansford, Lipscomb, Ochiltree, Sherman	118 min
May 30, 1:52 AM CDT	Mesoscale Discussion	SPC	Armstrong, Carson, Collingsworth, Donley, Gray, Hemphill and 1 more	83 min
May 30, 4:11 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Hardeman, Wichita and 1 more	94 min
May 30, 4:50 AM CDT	Severe Thunderstorm Watch	SPC	Clay, Collin, Cooke, Dallas, Denton, Fannin and 8 more	6 hr
May 30, 7:42 AM CDT	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Dallas, Denton and 11 more	93 min
May 30, 8:59 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Austin, Bell, Bosque, Bowie and 63 more	5 hr
May 30, 6:13 PM CDT	Mesoscale Discussion	SPC	Bandera, Brown, Callahan, Coleman, Comanche, Concho and 18 more	92 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.