Alert archive / Louisiana / Mesoscale Discussions in 2016

Mesoscale Discussion 240

March 18, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Mar 18, 2016, 7:06 PM CDT for 4 states. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Mar 18, 2016, 7:06 PM CDT (00:06 UTC)
Expired: Mar 18, 2016, 8:00 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

All 46 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Columbia County, AR, Drew County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, East Carroll 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, Carroll County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Madison County, MS, Rankin County, MS, Sharkey County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS, Bowie County, TX, Camp County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 102 km from the middle of the area, began a volume at 00:06 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 nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 0.1 hours before the alert went out and 289 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: 45 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 111 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 18, 7:28 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 24 more	92 min
Mar 18, 7:34 PM CDT	Mesoscale Discussion	SPC	Bee, Brooks, Duval, Goliad, Hidalgo, Jim Hogg and 7 more	116 min
Mar 18, 8:53 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 23 more	67 min
Mar 18, 11:11 PM CDT	Severe Thunderstorm Watch	SPC	Brooks, Duval, Hidalgo, Jim Hogg, Jim Wells, Kenedy and 4 more	5 hr
Mar 19, 12:34 AM CDT	Mesoscale Discussion	SPC	Brooks, Hidalgo, Jim Wells, Kenedy, Kleberg, Nueces and 3 more	86 min
Mar 19, 2:38 AM CDT	Mesoscale Discussion	SPC	Cameron, Hidalgo, Willacy	67 min

Nearby

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