Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 1348

June 21, 2011Beauregard Parish, Sabine Parish, Louisiana; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2011, 6:59 PM CDT for Beauregard Parish, Sabine Parish, Louisiana; 16 counties in Texas. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2011, 6:59 PM CDT (23:59 UTC)
Expired: Jun 21, 2011, 8:00 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

Counties Beauregard Parish, LA, Sabine Parish, LA, Angelina County, TX, Cherokee County, TX, Hardin County, TX, Houston County, TX, Jasper 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 12.0 hours before the alert went out and 160 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: 4282 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 552 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

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
Jun 21, 11:58 AM CDT	Mesoscale Discussion	SPC	Avoyelles, Catahoula, Concordia, East Carroll, Franklin, LaSalle and 3 more	62 min
Jun 21, 3:43 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Red River, Webster	62 min
Jun 20, 7:56 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Jack, Montague, Stephens and 3 more	94 min
Jun 20, 9:46 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Bosque, Clay, Collin, Comanche, Cooke and 30 more	9 hr
Jun 21, 3:15 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Collin, Comanche and 39 more	60 min
Jun 21, 4:58 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Bell, Bosque, Brewster, Brown and 84 more	10 hr
Jun 21, 6:21 PM CDT	Mesoscale Discussion	SPC	Collin, Dallas, Delta, Denton, Ellis, Fannin and 15 more	54 min

Nearby

Mesoscale Discussions in Texas, 2011 Mesoscale Discussions in Louisiana, 2011 Every mesoscale discussion in 2011

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.