Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 900

June 8, 201417 counties in Arkansas; 18 parishes in Louisiana; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2014, 1:39 PM CDT for 17 counties in Arkansas; 18 parishes in Louisiana; 16 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 8, 2014, 1:39 PM CDT (18:39 UTC)
Expired: Jun 8, 2014, 3:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 51 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 62 km from the middle of the area, began a volume at 18:38 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.

Severe Thunderstorm Watch 262Jun 8, 2:20 PM CDT

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 6.7 hours before the alert went out and 53 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: 2072 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 695 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: -59 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.7

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
Jun 7, 9:55 PM CDT	Mesoscale Discussion	SPC	Howard, Little River, Montgomery, Pike, Polk, Scott and 2 more	2 hr
Jun 8, 11:24 AM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Columbia, Union	66 min
Jun 8, 2:19 PM CDT	Severe Thunderstorm Watch	SPC	Ashley, Bradley, Calhoun, Chicot, Columbia, Desha and 10 more	7 hr
Jun 8, 3:37 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Columbia, Desha and 8 more	83 min
Jun 7, 7:06 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Foard, Hardeman, Montague and 2 more	2 hr
Jun 7, 8:14 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Cooke, Fannin, Foard and 6 more	8 hr
Jun 7, 9:50 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Castro, Childress, Cochran and 22 more	85 min
Jun 7, 11:43 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Dawson, Gaines, Howard, Martin and 2 more	92 min
Jun 8, 2:02 AM CDT	Mesoscale Discussion	SPC	Andrews, Archer, Baylor, Borden, Callahan, Clay and 33 more	118 min
Jun 8, 10:32 AM CDT	Mesoscale Discussion	SPC	Borden, Coke, Crosby, Dawson, Fisher, Gaines and 16 more	118 min
Jun 8, 2:37 PM CDT	Mesoscale Discussion	SPC	Dallam	53 min
Jun 8, 2:43 PM CDT	Mesoscale Discussion	SPC	Andrews, Coke, Concho, Crane, Crockett, Ector and 27 more	3 hr
Jun 8, 2:55 PM CDT	Tornado Watch	SPC	Dallam, Deaf Smith, Hartley, Oldham	8 hr
Jun 8, 5:09 PM CDT	Tornado Watch	SPC	Andrews, Brewster, Cochran, Crane, Culberson, Dawson and 15 more	8 hr
Jun 8, 5:25 PM CDT	Mesoscale Discussion	SPC	Dallam, Hartley, Sherman	2 hr
Jun 8, 6:34 PM CDT	Mesoscale Discussion	SPC	Bosque, Brewster, Concho, Coryell, Crockett, Hamilton and 14 more	86 min

Nearby

Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Arkansas, 2014 Mesoscale Discussions in Texas, 2014 Every mesoscale discussion in 2014

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.