Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 739

May 24, 201524 counties in Arkansas; 20 parishes in Louisiana; Bowie County, Cass County, Marion County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 24, 2015, 12:05 PM CDT for 24 counties in Arkansas; 20 parishes in Louisiana; Bowie County, Cass County, Marion County, Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 24, 2015, 12:05 PM CDT (17:05 UTC)
Expired: May 24, 2015, 2:00 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 47 counties

Calhoun County, AR, Clark County, AR, Columbia County, AR, Dallas County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sevier County, AR, Union County, AR, Yell County, AR, Allen Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Bowie County, TX, Cass County, TX, Marion County, TX

The radar

The Shreveport radar (KSHV), 61 km from the middle of the area, began a volume at 17:06 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.

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 5.1 hours before the alert went out and 52 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: 718 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 586 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.5

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
May 23, 10:49 PM CDT	Mesoscale Discussion	SPC	Benton, Crawford, Franklin, Scott, Sebastian, Washington	86 min
May 24, 12:34 PM CDT	Tornado Watch	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Carroll and 52 more	6 hr
May 24, 1:49 PM CDT	Tornado Watch	SPC	Ashley, Chicot	8 hr
May 24, 3:31 PM CDT	Mesoscale Discussion	SPC	Ashley, Baxter, Boone, Bradley, Calhoun, Clark and 31 more	89 min
May 24, 4:14 PM CDT	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more	8 hr
May 24, 6:04 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	116 min
May 24, 5:03 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Avoyelles, Catahoula, Concordia, East Baton Rouge and 30 more	117 min
May 23, 8:39 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bastrop, Bee, Bexar, Blanco, Caldwell and 18 more	2 hr
May 23, 8:57 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Cooke, Denton, Fannin and 7 more	93 min
May 23, 9:46 PM CDT	Mesoscale Discussion	SPC	Anderson, Austin, Bell, Bosque, Brazos, Burleson and 28 more	89 min
May 23, 10:00 PM CDT	Tornado Watch	SPC	Anderson, Austin, Bell, Bosque, Brazos, Burleson and 34 more	6 hr
May 23, 10:31 PM CDT	Severe Thunderstorm Watch	SPC	Aransas, Brooks, Cameron, Hidalgo, Jim Hogg, Jim Wells and 8 more	5 hr
May 23, 11:32 PM CDT	Mesoscale Discussion	SPC	Anderson, Atascosa, Austin, Bell, Brazos, Burleson and 36 more	88 min
May 23, 11:52 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Wells, Kenedy and 3 more	83 min
May 23, 11:59 PM CDT	Mesoscale Discussion	SPC	Bandera, Gillespie, Kendall, Kerr, Kinney, Real and 2 more	91 min
May 24, 2:12 AM CDT	Mesoscale Discussion	SPC	Aransas, Brazoria, Calhoun, Cameron, Fort Bend, Jackson and 4 more	93 min
May 24, 3:16 AM CDT	Mesoscale Discussion	SPC	Collin, Fannin, Grayson	59 min
May 24, 3:15 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Callahan, Childress, Coleman, Collingsworth and 26 more	90 min

Nearby

Mesoscale Discussions in Arkansas, 2015 Mesoscale Discussions in Louisiana, 2015 Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.