Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 399

April 2, 2017Beauregard Parish, Sabine Parish, Vernon Parish, Louisiana; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2017, 9:04 AM CDT for Beauregard Parish, Sabine Parish, Vernon Parish, Louisiana; 14 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 2, 2017, 9:04 AM CDT (14:04 UTC)
Expired: Apr 2, 2017, 11:30 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 95%

Counties Beauregard Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Houston County, TX, Jasper County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton 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, Walker County, TX

The radar

The Ft Polk radar (KPOE), 153 km from the middle of the area, began a volume at 14:04 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 109Apr 2, 10:35 AM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 2.1 hours before the alert went out and 171 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: 2197 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 489 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 317 m²/s²
Significant tornado parameter: 3.3
Supercell composite: 19.3

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 2, 9:05 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, East Baton Rouge, Iberville, Lafayette, Livingston and 5 more	85 min
Apr 2, 10:39 AM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 13 more	5 hr
Apr 2, 12:22 PM CDT	Mesoscale Discussion	SPC	Sabine	83 min
Apr 2, 12:49 PM CDT	Mesoscale Discussion	SPC	Avoyelles, Concordia, East Baton Rouge, East Carroll, East Feliciana, Franklin and 7 more	116 min
Apr 2, 1:34 PM CDT	Tornado Watch PDS	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 28 more	7 hr
Apr 2, 2:06 PM CDT	Mesoscale Discussion	SPC	Grant, LaSalle, Natchitoches, Rapides, Sabine, Vernon and 1 more	54 min
Apr 2, 3:08 PM CDT	Mesoscale Discussion	SPC	Ascension, East Baton Rouge, East Feliciana, Livingston, Saint Charles, Saint Helena and 6 more	3 hr
Apr 2, 3:13 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 13 more	92 min
Apr 2, 4:52 PM CDT	Tornado Watch	SPC	Ascension, Concordia, East Baton Rouge, East Feliciana, Iberville, Livingston and 8 more	9 hr
Apr 2, 5:54 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Catahoula and 7 more	96 min
Apr 1, 7:20 PM CDT	Mesoscale Discussion	SPC	Val Verde	85 min
Apr 1, 8:44 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 5 more	61 min
Apr 1, 10:06 PM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Comal, Edwards, Gillespie and 9 more	114 min
Apr 1, 10:28 PM CDT	Tornado Watch	SPC	Bandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more	8 hr
Apr 2, 2:53 AM CDT	Mesoscale Discussion	SPC	Bandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more	82 min
Apr 2, 5:16 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Bandera, Bastrop, Bell, Bexar and 51 more	119 min
Apr 2, 6:00 AM CDT	Tornado Watch	SPC	Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 51 more	7 hr
Apr 2, 9:44 AM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Caldwell, Cherokee and 19 more	2 hr
Apr 2, 4:23 PM CDT	Mesoscale Discussion	SPC	Aransas, Brazoria, Calhoun, Cameron, Jackson, Kenedy and 5 more	3 hr

Nearby

Mesoscale Discussions in Texas, 2017 Mesoscale Discussions in Louisiana, 2017 Every mesoscale discussion in 2017

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.