Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 432

April 3, 2012Caddo Parish, De Soto Parish, Louisiana; 15 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2012, 1:46 PM CDT for Caddo Parish, De Soto Parish, Louisiana; 15 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Apr 3, 2012, 1:46 PM CDT (18:46 UTC)
Expired: Apr 3, 2012, 3:15 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

Counties Caddo Parish, LA, De Soto Parish, LA, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 81 km from the middle of the area, began a volume at 18:47 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 135Apr 3, 2:35 PM CDT

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 6.8 hours before the alert went out and 90 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: 1328 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 475 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 286 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.5

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
Apr 2, 10:10 PM CDT	Mesoscale Discussion	SPC	Iberia, St. Mary	3 hr
Apr 3, 1:42 PM CDT	Mesoscale Discussion	SPC	East Carroll, Madison, West Carroll	93 min
Apr 3, 2:22 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 16 more	8 hr
Apr 3, 2:36 PM CDT	Tornado Watch	SPC	Bossier, Caddo, De Soto, Sabine	7 hr
Apr 3, 5:24 PM CDT	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 16 more	66 min
Apr 3, 6:53 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, Claiborne, De Soto, Red River, Webster	67 min
Apr 2, 7:17 PM CDT	Mesoscale Discussion	SPC	Hansford, Hemphill, Hutchinson, Lipscomb, Ochiltree, Roberts	58 min
Apr 2, 9:12 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Hardeman, Haskell, Hemphill and 12 more	63 min
Apr 2, 10:51 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Jack, Montague, Wichita and 2 more	5 hr
Apr 2, 11:45 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 17 more	2 hr
Apr 3, 1:14 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Clay, Jack, Montague and 7 more	2 hr
Apr 3, 3:32 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Borden, Brown, Callahan, Clay and 24 more	88 min
Apr 3, 8:36 AM CDT	Mesoscale Discussion	SPC	Archer, Bell, Blanco, Bosque, Brown, Burnet and 40 more	84 min
Apr 3, 9:18 AM CDT	Severe Thunderstorm Watch	SPC	Bosque, Clay, Collin, Comanche, Cooke, Coryell and 33 more	8 hr
Apr 3, 11:47 AM CDT	Mesoscale Discussion	SPC	Bosque, Collin, Cooke, Coryell, Dallas, Delta and 32 more	118 min
Apr 3, 12:08 PM CDT	Tornado Watch	SPC	Anderson, Bell, Bosque, Collin, Coryell, Dallas and 30 more	9 hr
Apr 3, 1:12 PM CDT	Mesoscale Discussion	SPC	Bosque, Collin, Dallas, Denton, Ellis, Erath and 16 more	93 min
Apr 3, 2:21 PM CDT	Mesoscale Discussion	SPC	Lamar, Montague	84 min
Apr 3, 3:05 PM CDT	Mesoscale Discussion	SPC	Grayson, Lamar, Red River	85 min
Apr 3, 4:38 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Caldwell, Fayette and 10 more	67 min
Apr 3, 5:00 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Delta, Falls and 18 more	60 min

Nearby

Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in Louisiana, 2012 Every mesoscale discussion in 2012

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.