Alert archive / Louisiana / Mesoscale Discussions in 2016

Mesoscale Discussion 531

May 2, 20164 states

The Storm Prediction Center issued this mesoscale discussion at May 2, 2016, 5:48 AM CDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 2, 2016, 5:48 AM CDT (10:48 UTC)
Expired: May 2, 2016, 7:15 AM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 54 counties

Ashley County, AR, Chicot County, AR, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Humphreys County, MS, Issaquena County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Angelina County, TX, Hardin County, TX, Houston County, TX, Jasper County, TX, Liberty County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX

The radar

The Ft Polk radar (KPOE), 64 km from the middle of the area, began a volume at 10:53 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 00:00Z, 10.8 hours before the alert went out and 126 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: 767 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1159 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.4

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
May 2, 2:43 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Chicot, Drew, Union	2 hr
May 2, 3:17 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 21 more	5 hr
May 2, 1:07 AM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, De Soto, Jefferson Davis, Natchitoches and 3 more	113 min
May 2, 12:38 AM CDT	Mesoscale Discussion	SPC	Starr, Zapata	2 hr

Nearby

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