Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 313

April 13, 201926 parishes in Louisiana; 31 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2019, 1:52 AM CDT for 26 parishes in Louisiana; 31 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2019, 1:52 AM CDT (06:52 UTC)
Expired
Apr 13, 2019, 3:45 AM CDT
In force
113 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 57 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Kaufman County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 42 km from the middle of the area, began a volume at 06:55 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 00:00Z, 6.9 hours before the alert went out and 235 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 00:00Z on 2019-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 707 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 2019-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 335 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
707 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
625 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
335 m²/s²
0-3 km storm-relative helicity
550 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.7

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.

IssuedProductOfficeCountiesLasted
Apr 12, 10:14 PM CDTMesoscale DiscussionSPCBeauregard, Calcasieu, Vernon3 hr
Apr 13, 9:49 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 2 more56 min
Apr 13, 10:01 AM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more5 hr
Apr 13, 11:26 AM CDTTornado WatchSPCAllen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 18 more8 hr
Apr 13, 11:52 AM CDTMesoscale DiscussionSPCDe Soto, Natchitoches, Red River, Sabine, Vernon83 min
Apr 13, 12:53 PM CDTMesoscale DiscussionSPCEast Carroll, Franklin, Madison, Richland, Tensas, West Carroll2 hr
Apr 13, 1:38 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Catahoula, De Soto, Grant and 7 more97 min
Apr 13, 2:20 PM CDTTornado WatchSPCCatahoula, Concordia, East Carroll, East Feliciana, Franklin, Madison and 7 more10 hr
Apr 13, 3:39 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Bienville, Bossier, Calcasieu and 25 more96 min
Apr 13, 4:35 PM CDTMesoscale DiscussionSPCCaldwell, Franklin, Grant, LaSalle, Madison, Richland and 2 more55 min
Apr 12, 11:40 PM CDTMesoscale DiscussionSPCCoke, Crane, Crockett, Ector, Glasscock, Howard and 13 more2 hr
Apr 13, 12:56 AM CDTMesoscale DiscussionSPCBandera, Crockett, Edwards, Kerr, Kimble, Kinney and 7 more2 hr
Apr 13, 1:32 AM CDTSevere Thunderstorm WatchSPCBrown, Callahan, Coke, Coleman, Concho, Crane and 21 more8 hr
Apr 13, 1:50 AM CDTTornado WatchSPCBandera, Crockett, Edwards, Frio, Gillespie, Kendall and 13 more8 hr
Apr 13, 4:35 AM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coke, Coleman, Comanche and 26 more55 min
Apr 13, 4:50 AM CDTMesoscale DiscussionSPCBandera, Crockett, Edwards, Frio, Gillespie, Kendall and 13 more55 min
Apr 13, 6:48 AM CDTMesoscale DiscussionSPCBell, Bosque, Brown, Callahan, Coleman, Comanche and 27 more57 min
Apr 13, 7:11 AM CDTMesoscale DiscussionSPCBandera, Bastrop, Bell, Bexar, Blanco, Burleson and 28 more2 hr
Apr 13, 7:55 AM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bosque, Comanche, Coryell, Dallas and 27 more6 hr
Apr 13, 8:38 AM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 22 more5 hr
Apr 13, 9:40 AM CDTMesoscale DiscussionSPCBastrop, Bell, Bexar, Blanco, Brazos, Burleson and 19 more95 min
Apr 13, 11:11 AM CDTMesoscale DiscussionSPCBrazos, Grimes, Hardin, Harris, Jasper, Liberty and 10 more34 min

Nearby

Mesoscale Discussions in Texas, 2019Mesoscale Discussions in Louisiana, 2019Every 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.