Alert archive / Arkansas / Mesoscale Discussions in 2016

Mesoscale Discussion 361

April 11, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2016, 11:48 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 11, 2016, 11:48 AM CDT (16:48 UTC)
Expired: Apr 11, 2016, 2:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 48 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Hempstead County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Phillips County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Coahoma County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Bowie County, TX, Cass County, TX, Marion County, TX

The radar

The Shreveport radar (KSHV), 151 km from the middle of the area, began a volume at 16:51 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, 4.8 hours before the alert went out and 142 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: 520 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 389 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.2

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 11, 12:57 AM CDT	Severe Thunderstorm Watch	SPC	Crawford, Sebastian, Washington	4 hr
Apr 11, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	Ashley, Bradley, Calhoun, Chicot, Columbia, Desha and 5 more	6 hr
Apr 11, 1:38 PM CDT	Severe Thunderstorm Watch	SPC	Hempstead, Howard, Little River, Miller, Polk, Sevier	9 hr
Apr 11, 3:42 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Chicot, Columbia, Drew, Union	93 min
Apr 11, 6:09 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Columbia, Drew and 2 more	66 min
Apr 11, 12:15 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Catahoula, Concordia, East Feliciana, Evangeline and 12 more	3 hr
Apr 11, 6:58 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more	5 hr
Apr 11, 6:40 PM CDT	Mesoscale Discussion	SPC	Clarke, Covington, Forrest, Greene, Jones, Lamar and 2 more	65 min
Apr 10, 7:36 PM CDT	Mesoscale Discussion	SPC	Montague	114 min
Apr 10, 8:54 PM CDT	Mesoscale Discussion	SPC	Dimmit, Edwards, Kinney, Maverick, Real, Uvalde and 2 more	66 min
Apr 10, 9:31 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Cooke, Cottle and 19 more	59 min
Apr 10, 9:52 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Cooke, Foard, Hardeman and 4 more	6 hr
Apr 10, 11:06 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Comal, Dimmit, Frio and 9 more	54 min
Apr 11, 6:15 AM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Delta, Denton, Fannin and 7 more	3 hr
Apr 11, 12:39 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Camp, Clay, Collin, Cooke and 33 more	2 hr
Apr 11, 1:43 PM CDT	Mesoscale Discussion	SPC	Austin, Brazos, Grimes, Hardin, Harris, Liberty and 8 more	3 hr
Apr 11, 3:26 PM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Dallas, Delta, Denton and 18 more	94 min
Apr 11, 4:49 PM CDT	Mesoscale Discussion	SPC	Collin, Dallas, Denton, Hunt, Rains, Rockwall and 1 more	86 min
Apr 11, 5:27 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Fisher, Haskell, Jones, King and 7 more	93 min

Nearby

Mesoscale Discussions in Arkansas, 2016 Mesoscale Discussions in Louisiana, 2016 Mesoscale Discussions in Mississippi, 2016 Every mesoscale discussion in 2016

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.