Alert archive / Louisiana / Mesoscale Discussions in 2019

Mesoscale Discussion 280

April 7, 201923 parishes in Louisiana; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2019, 2:49 PM CDT for 23 parishes in Louisiana; 13 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Apr 7, 2019, 2:49 PM CDT (19:49 UTC)
Expired
Apr 7, 2019, 4:15 PM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 36 counties

Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette 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, Winn Parish, LA, Angelina County, TX, Chambers County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX

The radar

The Lake Charles radar (KLCH), 73 km from the middle of the area, began a volume at 19:52 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, 7.8 hours before the alert went out and 75 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2019-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2596 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2019-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2596 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
449 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.4

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.

IssuedProductOfficeCountiesLasted
Apr 6, 7:44 PM CDTMesoscale DiscussionSPCBienville, Caldwell, De Soto, Franklin, Grant, Jackson and 11 more2 hr
Apr 7, 5:29 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more2 hr
Apr 7, 12:27 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 24 more93 min
Apr 7, 1:11 PM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 24 more6 hr
Apr 7, 1:13 PM CDTMesoscale DiscussionSPCEast Carroll, Madison, Morehouse, Richland, West Carroll2 hr
Apr 7, 3:41 PM CDTSevere Thunderstorm WatchSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more6 hr
Apr 7, 6:44 PM CDTMesoscale DiscussionSPCAscension, East Baton Rouge, East Carroll, East Feliciana, Livingston, Madison and 6 more2 hr
Apr 7, 1:00 AM CDTMesoscale DiscussionSPCAransas, Atascosa, Bee, Bexar, DeWitt, Dimmit and 19 more90 min
Apr 7, 1:55 AM CDTSevere Thunderstorm WatchSPCAransas, Atascosa, Bee, Bexar, Brooks, Calhoun and 32 more7 hr
Apr 7, 6:41 AM CDTMesoscale DiscussionSPCAransas, Atascosa, Austin, Bastrop, Bee, Bexar and 38 more94 min
Apr 7, 7:11 AM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more8 hr
Apr 7, 11:13 AM CDTMesoscale DiscussionSPCAustin, Brazoria, Calhoun, Colorado, Fort Bend, Galveston and 13 more92 min

Nearby

Mesoscale Discussions in Louisiana, 2019Mesoscale Discussions in Texas, 2019Every mesoscale discussion in 2019

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.