Alert archive / Arkansas / Mesoscale Discussions in 2023

Mesoscale Discussion 321

March 24, 20234 states

The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2023, 12:42 PM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Mar 24, 2023, 12:42 PM CDT (17:42 UTC)
Expired
Mar 24, 2023, 3:15 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch likely
Chance of a watch
95%
All 55 counties

Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Union 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, Marion County, TX, Morris County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 122 km from the middle of the area, began a volume at 17:43 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 12:00Z, 5.7 hours before the alert went out and 117 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 2023-03-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 127 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 2023-03-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 301 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
127 J/kg
Mixed-layer CIN
-276 J/kg
Mixed-layer LCL
728 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
301 m²/s²
0-3 km storm-relative helicity
403 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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
Mar 24, 1:33 PM CDTTornado WatchSPCClark, Columbia, Dallas, Garland, Grant, Hempstead and 12 more5 hr
Mar 24, 3:14 PM CDTMesoscale DiscussionSPCClay, Cleburne, Conway, Craighead, Crittenden, Cross and 26 more61 min
Mar 24, 3:38 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 18 more2 hr
Mar 24, 4:56 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 7 more2 hr
Mar 24, 5:20 PM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 20 more8 hr
Mar 24, 5:28 PM CDTMesoscale DiscussionSPCCraighead, Crittenden, Cross, Greene, Jackson, Lawrence and 4 more62 min
Mar 24, 6:39 PM CDTMesoscale DiscussionSPCAshley, Chicot, Desha96 min
Mar 24, 5:32 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Evangeline, Pointe Coupee, Rapides, Saint Landry and 2 more88 min
Mar 23, 9:32 PM CDTMesoscale DiscussionSPCAtoka, Carter, Coal, Cotton, Garvin, Hughes and 9 more118 min
Mar 23, 11:06 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Cotton, Jefferson, Johnston and 4 more8 hr
Mar 24, 1:11 AM CDTMesoscale DiscussionSPCBryan, Love, Marshall2 hr
Mar 24, 3:46 AM CDTMesoscale DiscussionSPCBryan119 min
Mar 24, 6:39 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Pushmataha2 hr
Mar 23, 9:13 PM CDTMesoscale DiscussionSPCCoke, Crockett, Fisher, Irion, Mitchell, Nolan and 6 more3 hr
Mar 24, 4:18 AM CDTSevere Thunderstorm WatchSPCBosque, Collin, Dallas, Delta, Denton, Ellis and 13 more5 hr

Nearby

Mesoscale Discussions in Arkansas, 2023Mesoscale Discussions in Texas, 2023Mesoscale Discussions in Louisiana, 2023Every mesoscale discussion in 2023

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.