Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 472

April 24, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2020, 7:19 PM CDT for 4 states. It was in force for 101 min.

The area

The outline as issued.

The facts

Issued
Apr 24, 2020, 7:19 PM CDT (00:19 UTC)
Expired
Apr 24, 2020, 9:00 PM CDT
In force
101 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 146
All 48 counties

Clark County, AR, Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Bossier Parish, LA, Caddo Parish, LA, Webster Parish, LA, Choctaw County, OK, Latimer County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 133 km from the middle of the area, began a volume at 00:18 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.3 hours before the alert went out and 138 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 2020-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 319 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 00:00Z on 2020-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.1939587897117Sfc1 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
319 J/kg
Mixed-layer CIN
-165 J/kg
Mixed-layer LCL
1943 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
350 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.1

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 24, 8:31 PM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Boone, Bradley, Calhoun, Chicot and 30 more5 hr
Apr 24, 9:26 PM CDTMesoscale DiscussionSPCColumbia, Lafayette, Miller94 min
Apr 24, 10:17 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Bradley, Calhoun, Chicot and 29 more118 min
Apr 24, 7:43 PM CDTMesoscale DiscussionSPCBienville, Caldwell, Claiborne, Grant, Jackson, Lincoln and 6 more62 min

Nearby

Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Oklahoma, 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.