Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 367

April 12, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2020, 6:14 PM CDT for 4 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Apr 12, 2020, 6:14 PM CDT (23:14 UTC)
Expired
Apr 12, 2020, 7:45 PM CDT
In force
91 min
Issued by
the Storm Prediction Center
All 57 counties

Boone County, AR, Calhoun County, AR, Carroll County, AR, Clark County, AR, Columbia County, AR, Conway County, AR, Dallas County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Union County, AR, Yell County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Webster Parish, LA, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Hopkins County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Western Arkansas radar (KSRX), 103 km from the middle of the area, began a volume at 23:15 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 (KSHV), launched 12:00Z, 11.2 hours before the alert went out and 223 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 2020-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 605 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, Shreveport, LA at 12:00Z on 2020-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 255 square meters per square second.1939587897Sfc1 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
605 J/kg
Mixed-layer CIN
-277 J/kg
Mixed-layer LCL
681 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
255 m²/s²
0-3 km storm-relative helicity
308 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.1

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 12, 5:52 AM CDTTornado WatchSPCUnion8 hr
Apr 12, 10:24 AM CDTMesoscale DiscussionSPCAshley, Chicot96 min
Apr 12, 10:41 AM CDTTornado Watch PDSSPCAshley, Bradley, Chicot, Desha, Drew10 hr
Apr 12, 2:51 PM CDTSevere Thunderstorm WatchSPCLittle River, Miller, Sevier5 hr
Apr 12, 4:44 PM CDTMesoscale DiscussionSPCBenton, Boone, Bradley, Calhoun, Carroll, Clark and 39 more2 hr
Apr 12, 5:59 PM CDTSevere Thunderstorm WatchSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 47 more4 hr
Apr 12, 7:18 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 13 more87 min
Apr 12, 9:30 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more90 min
Apr 12, 12:03 PM CDTMesoscale DiscussionSPCEast Carroll, Franklin, Madison, Morehouse, Richland, West Carroll87 min
Apr 12, 1:02 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 12 more118 min
Apr 12, 1:24 PM CDTTornado WatchSPCAcadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 16 more9 hr
Apr 12, 5:27 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 6 more63 min
Apr 12, 5:44 PM CDTMesoscale DiscussionSPCMadison, Tensas91 min
Apr 11, 8:57 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cleveland, Coal, Garvin and 11 more63 min
Apr 11, 9:01 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Coal, Garvin, Jefferson and 6 more4 hr
Apr 11, 9:23 PM CDTMesoscale DiscussionSPCComanche, Cotton, Jackson, Tillman67 min
Apr 11, 11:41 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Coal, Garvin, Jefferson and 6 more94 min
Apr 12, 1:10 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 34 more95 min
Apr 11, 7:51 PM CDTMesoscale DiscussionSPCEdwards, Kinney, Real, Sutton, Uvalde, Val Verde84 min
Apr 11, 8:37 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 23 more5 hr
Apr 11, 11:03 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Caldwell, Comal, DeWitt and 12 more57 min
Apr 12, 1:37 AM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Bosque, Brazos, Brown and 44 more113 min
Apr 12, 1:59 AM CDTTornado WatchSPCBandera, Bastrop, Bell, Bexar, Blanco, Bosque and 37 more6 hr
Apr 12, 4:15 AM CDTMesoscale DiscussionSPCBandera, Bastrop, Bell, Blanco, Bosque, Brown and 24 more90 min

Nearby

Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Louisiana, 2020Every mesoscale discussion in 2020

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.