Alert archive / Louisiana / Mesoscale Discussions in 2016

Mesoscale Discussion 512

April 30, 20168 parishes in Louisiana; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2016, 7:38 AM CDT for 8 parishes in Louisiana; 7 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2016, 7:38 AM CDT (12:38 UTC)
Expired: Apr 30, 2016, 8:45 AM CDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Vermilion Parish, LA, Chambers County, TX, Fort Bend County, TX, Hardin County, TX, Harris County, TX, Jefferson County, TX, Liberty County, TX, Orange County, TX

The radar

The Lake Charles radar (KLCH), 76 km from the middle of the area, began a volume at 12:36 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.6 hours before the alert went out and 78 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: 1273 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 690 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 249 m²/s²
0-3 km storm-relative helicity: 295 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 9.9

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 29, 8:56 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 8 more	94 min
Apr 29, 9:58 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 8 more	7 hr
Apr 29, 11:42 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more	93 min
Apr 30, 3:23 AM CDT	Mesoscale Discussion	SPC	Beauregard, Bienville, Bossier, Claiborne, De Soto, Lincoln and 5 more	97 min
Apr 30, 5:11 AM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 22 more	9 hr
Apr 30, 10:22 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 16 more	53 min
Apr 30, 11:38 AM CDT	Severe Thunderstorm Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more	7 hr
Apr 30, 1:35 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 22 more	55 min
Apr 30, 4:00 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 10 more	2 hr
Apr 29, 8:07 PM CDT	Mesoscale Discussion	SPC	Bandera, Bastrop, Bell, Bexar, Blanco, Bosque and 29 more	83 min
Apr 29, 8:20 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 19 more	9 hr
Apr 30, 1:46 AM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Comal, Hays, Kendall and 3 more	59 min
Apr 30, 5:12 AM CDT	Mesoscale Discussion	SPC	Austin, Burleson, Colorado, Fayette, Grimes, Harris and 7 more	93 min
Apr 30, 5:27 AM CDT	Severe Thunderstorm Watch	SPC	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 11 more	6 hr

Nearby

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