Alert archive / Louisiana / Mesoscale Discussions in 2016

Mesoscale Discussion 189

March 8, 2016Union County, Arkansas; 21 parishes in Louisiana; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 8, 2016, 5:52 PM CST for Union County, Arkansas; 21 parishes in Louisiana; 8 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Mar 8, 2016, 5:52 PM CST (23:52 UTC)
Expired: Mar 8, 2016, 7:15 PM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 30 counties

Union County, AR, Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Hardin County, TX, Jasper County, TX, Newton County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX

The radar

The Ft Polk radar (KPOE), 82 km from the middle of the area, began a volume at 23:54 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

Shreveport, LA (KBAD), launched 12:00Z, 11.9 hours before the alert went out and 85 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: 7 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 710 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 280 m²/s²
0-3 km storm-relative helicity: 415 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Mar 8, 12:41 PM CST	Tornado Watch	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	5 hr
Mar 8, 3:11 PM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 7 more	94 min
Mar 7, 6:42 PM CST	Mesoscale Discussion	SPC	Bosque, Comanche, Cooke, Dallas, Denton, Ellis and 10 more	63 min
Mar 7, 11:41 PM CST	Mesoscale Discussion	SPC	Borden, Coke, Concho, Crane, Crockett, Dawson and 27 more	2 hr
Mar 8, 1:18 AM CST	Severe Thunderstorm Watch	SPC	Bosque, Brown, Callahan, Coke, Coleman, Collin and 48 more	10 hr
Mar 8, 3:36 AM CST	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Cottle, Dickens and 6 more	84 min
Mar 8, 3:57 AM CST	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coleman and 36 more	2 hr
Mar 8, 7:06 AM CST	Mesoscale Discussion	SPC	Anderson, Austin, Bastrop, Bell, Blanco, Bosque and 64 more	2 hr
Mar 8, 7:24 AM CST	Tornado Watch	SPC	Anderson, Bastrop, Bell, Blanco, Brazos, Burleson and 29 more	8 hr
Mar 8, 9:00 AM CST	Mesoscale Discussion	SPC	Anderson, Bastrop, Bell, Bosque, Burleson, Burnet and 35 more	90 min
Mar 8, 10:46 AM CST	Mesoscale Discussion	SPC	Angelina, Cherokee, Hardin, Houston, Jasper, Liberty and 12 more	89 min
Mar 8, 1:10 PM CST	Mesoscale Discussion	SPC	Bell, Blanco, Bosque, Brown, Burnet, Coke and 32 more	95 min

Nearby

Mesoscale Discussions in Louisiana, 2016 Mesoscale Discussions in Texas, 2016 Mesoscale Discussions in Arkansas, 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.