Alert archive / Louisiana / Mesoscale Discussions in 2019

Mesoscale Discussion 592

May 8, 20196 counties in Arkansas; 17 parishes in Louisiana; Jasper County, Newton County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2019, 5:55 PM CDT for 6 counties in Arkansas; 17 parishes in Louisiana; Jasper County, Newton County, Texas. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
May 8, 2019, 5:55 PM CDT (22:55 UTC)
Expired
May 8, 2019, 7:30 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 25 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Cleveland County, AR, Drew County, AR, Union County, AR, Beauregard Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Jasper County, TX, Newton County, TX

The radar

The Ft Polk radar (KPOE), 103 km from the middle of the area, began a volume at 22:54 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 12:00Z, 10.9 hours before the alert went out and 104 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 12:00Z on 2019-05-08Temperature 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 12:00Z on 2019-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.193958Sfc1 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
0 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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, 2:16 PM CDTTornado WatchSPCColumbia, Hempstead, Lafayette, Miller, Nevada6 hr
May 8, 3:48 PM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Columbia, Drew and 3 more117 min
May 8, 4:02 PM CDTTornado WatchSPCAshley, Bradley, Calhoun, Chicot, Cleveland, Desha and 4 more5 hr
May 8, 2:07 PM CDTMesoscale DiscussionSPCBeauregard, Bossier, Caddo, De Soto, Natchitoches, Red River and 3 more53 min
May 7, 8:25 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 21 more95 min
May 7, 9:13 PM CDTTornado WatchSPCArcher, Baylor, Clay, Foard, Hardeman, Knox and 2 more8 hr
May 7, 9:38 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Collingsworth, Deaf Smith and 16 more67 min
May 7, 10:02 PM CDTMesoscale DiscussionSPCAndrews, Bailey, Borden, Briscoe, Castro, Cochran and 43 more58 min
May 7, 10:58 PM CDTSevere Thunderstorm WatchSPCBrown, Callahan, Coke, Coleman, Concho, Crockett and 18 more8 hr
May 8, 12:56 AM CDTMesoscale DiscussionSPCBosque, Collin, Comanche, Cooke, Coryell, Dallas and 20 more64 min
May 8, 6:29 AM CDTMesoscale DiscussionSPCAnderson, Bandera, Bastrop, Bell, Blanco, Bosque and 38 more61 min
May 8, 6:54 AM CDTSevere Thunderstorm WatchSPCBandera, Bell, Blanco, Bosque, Brown, Burnet and 28 more6 hr
May 8, 10:11 AM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Bosque, Brown, Burnet and 28 more2 hr
May 8, 12:21 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Austin, Bastrop, Brazos, Burleson and 30 more84 min
May 8, 12:58 PM CDTSevere Thunderstorm WatchSPCAnderson, Bastrop, Brazos, Burleson, Caldwell, Fayette and 13 more5 hr
May 8, 3:47 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Dallam and 19 more118 min

Nearby

Mesoscale Discussions in Louisiana, 2019Mesoscale Discussions in Arkansas, 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.