Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 321

April 13, 20195 parishes in Louisiana; 18 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2019, 11:52 AM CDT for 5 parishes in Louisiana; 18 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2019, 11:52 AM CDT (16:52 UTC)
Expired: Apr 13, 2019, 1:15 PM CDT
In force: 83 min
Issued by: the Storm Prediction Center

All 23 counties

De Soto Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Anderson County, TX, Angelina County, TX, Brazos County, TX, Cherokee County, TX, Freestone County, TX, Grimes County, TX, Houston County, TX, Leon County, TX, Madison County, TX, Nacogdoches County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Trinity County, TX, Walker County, TX

The radar

The Shreveport radar (KSHV), 144 km from the middle of the area, began a volume at 16:52 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

Shreveport, LA (KBAD), launched 12:00Z, 4.9 hours before the alert went out and 152 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: 651 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 337 m²/s²
0-3 km storm-relative helicity: 747 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 12, 10:14 PM CDT	Mesoscale Discussion	SPC	Beauregard, Calcasieu, Vernon	3 hr
Apr 13, 1:52 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more	113 min
Apr 13, 9:49 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 2 more	56 min
Apr 13, 10:01 AM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	5 hr
Apr 13, 11:26 AM CDT	Tornado Watch	SPC	Allen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 18 more	8 hr
Apr 13, 12:53 PM CDT	Mesoscale Discussion	SPC	East Carroll, Franklin, Madison, Richland, Tensas, West Carroll	2 hr
Apr 13, 1:38 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Catahoula, De Soto, Grant and 7 more	97 min
Apr 13, 2:20 PM CDT	Tornado Watch	SPC	Catahoula, Concordia, East Carroll, East Feliciana, Franklin, Madison and 7 more	10 hr
Apr 13, 3:39 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Bienville, Bossier, Calcasieu and 25 more	96 min
Apr 13, 4:35 PM CDT	Mesoscale Discussion	SPC	Caldwell, Franklin, Grant, LaSalle, Madison, Richland and 2 more	55 min
Apr 12, 11:40 PM CDT	Mesoscale Discussion	SPC	Coke, Crane, Crockett, Ector, Glasscock, Howard and 13 more	2 hr
Apr 13, 12:56 AM CDT	Mesoscale Discussion	SPC	Bandera, Crockett, Edwards, Kerr, Kimble, Kinney and 7 more	2 hr
Apr 13, 1:32 AM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Concho, Crane and 21 more	8 hr
Apr 13, 1:50 AM CDT	Tornado Watch	SPC	Bandera, Crockett, Edwards, Frio, Gillespie, Kendall and 13 more	8 hr
Apr 13, 4:35 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coke, Coleman, Comanche and 26 more	55 min
Apr 13, 4:50 AM CDT	Mesoscale Discussion	SPC	Bandera, Crockett, Edwards, Frio, Gillespie, Kendall and 13 more	55 min
Apr 13, 6:48 AM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Brown, Callahan, Coleman, Comanche and 27 more	57 min
Apr 13, 7:11 AM CDT	Mesoscale Discussion	SPC	Bandera, Bastrop, Bell, Bexar, Blanco, Burleson and 28 more	2 hr
Apr 13, 7:55 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Comanche, Coryell, Dallas and 27 more	6 hr
Apr 13, 8:38 AM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 22 more	5 hr
Apr 13, 9:40 AM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Bexar, Blanco, Brazos, Burleson and 19 more	95 min
Apr 13, 11:11 AM CDT	Mesoscale Discussion	SPC	Brazos, Grimes, Hardin, Harris, Jasper, Liberty and 10 more	34 min

Nearby

Mesoscale Discussions in Texas, 2019 Mesoscale Discussions in Louisiana, 2019 Every mesoscale discussion in 2019

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.