Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 596

May 8, 201919 parishes in Louisiana; 27 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2019, 10:31 PM CDT for 19 parishes in Louisiana; 27 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
May 8, 2019, 10:31 PM CDT (03:31 UTC)
Expired
May 9, 2019, 12:00 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 46 counties

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, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Brazos County, TX, Cherokee County, TX, Fort Bend County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Houston County, TX, Jasper County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX

The radar

The Shreveport radar (KSHV), 119 km from the middle of the area, began a volume at 03:36 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

Shreveport, LA (KBAD), launched 00:00Z, 3.5 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-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 2019-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Shreveport, LA at 00:00Z on 2019-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 407 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1331 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
407 m²/s²
0-3 km storm-relative helicity
530 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.

IssuedProductOfficeCountiesLasted
May 8, 7:02 PM CDTMesoscale DiscussionSPCCatahoula, East Carroll, Franklin, Madison, Morehouse, Richland and 2 more58 min
May 9, 6:58 AM CDTMesoscale DiscussionSPCCatahoula, Franklin, Grant, LaSalle, Madison, Rapides and 1 more62 min
May 9, 11:22 AM CDTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Livingston, Saint Helena, Tangipahoa, Washington and 1 more113 min
May 9, 11:46 AM CDTTornado WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more6 hr
May 9, 1:34 PM CDTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 3 more116 min
May 9, 3:35 PM CDTMesoscale DiscussionSPCAscension, Livingston, Saint John the Baptist, Saint Tammany115 min
May 8, 7:32 PM CDTMesoscale DiscussionSPCBailey, Castro, Deaf Smith, Hale, Lamb, Parmer and 1 more58 min
May 9, 1:01 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bee, Bexar, Comal, Dimmit and 20 more119 min
May 9, 2:25 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 33 more11 hr
May 9, 5:40 PM CDTMesoscale DiscussionSPCAustin, Brazoria, Calhoun, Chambers, Colorado, Fort Bend and 18 more95 min
May 9, 6:31 PM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 15 more8 hr

Nearby

Mesoscale Discussions in Texas, 2019Mesoscale Discussions in Louisiana, 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.