Alert archive / Arkansas / Mesoscale Discussions in 2023

Mesoscale Discussion 474

April 5, 202331 counties in Arkansas; 9 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2023, 12:56 AM CDT for 31 counties in Arkansas; 9 counties in Missouri. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Apr 5, 2023, 12:56 AM CDT (05:56 UTC)
Expired
Apr 5, 2023, 2:30 AM CDT
In force
94 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
60%
All 40 counties

Baxter County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Perry County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Butler County, MO, Carter County, MO, Howell County, MO, Oregon County, MO, Reynolds County, MO, Ripley County, MO, Shannon County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Little Rock radar (KLZK), 100 km from the middle of the area, began a volume at 05:59 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

Springfield, MO (KSGF), launched 00:00Z, 5.9 hours before the alert went out and 224 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, Springfield, MO at 00:00Z on 2023-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1291 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, Springfield, MO at 00:00Z on 2023-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 476 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
1291 J/kg
Mixed-layer CIN
-109 J/kg
Mixed-layer LCL
1115 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
476 m²/s²
0-3 km storm-relative helicity
702 m²/s²
Significant tornado parameter
2.3
Supercell composite
6.2

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 4, 8:46 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 19 more119 min
Apr 5, 1:32 AM CDTTornado WatchSPCBaxter, Clay, Cleburne, Conway, Craighead, Faulkner and 23 more9 hr
Apr 5, 2:03 AM CDTMesoscale DiscussionSPCConway, Izard, Sharp, Stone, Van Buren87 min
Apr 5, 2:27 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Madison, Washington10 hr
Apr 5, 4:25 AM CDTMesoscale DiscussionSPCClark, Garland, Hempstead, Hot Spring, Howard, Little River and 10 more95 min
Apr 5, 4:54 AM CDTTornado WatchSPCBenton, Boone, Carroll, Crawford, Franklin, Hempstead and 18 more6 hr
Apr 5, 6:25 AM CDTMesoscale DiscussionSPCBoone, Marion95 min
Apr 5, 8:44 AM CDTTornado WatchSPCArkansas, Baxter, Bradley, Calhoun, Clark, Clay and 39 more7 hr
Apr 5, 11:51 AM CDTMesoscale DiscussionSPCArkansas, Clay, Craighead, Crittenden, Cross, Greene and 9 more84 min
Apr 4, 8:15 PM CDTMesoscale DiscussionSPCAndrew, Bates, Buchanan, Caldwell, Cass, Clay and 11 more2 hr
Apr 4, 11:49 PM CDTMesoscale DiscussionSPCPutnam, Schuyler86 min
Apr 5, 12:05 AM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Cass, Cedar, Chariton and 14 more4 hr
Apr 5, 3:27 AM CDTMesoscale DiscussionSPCLincoln, Pike, Saint Charles, City of Saint Louis93 min
Apr 5, 3:48 AM CDTMesoscale DiscussionSPCCape Girardeau27 min

Nearby

Mesoscale Discussions in Arkansas, 2023Mesoscale Discussions in Missouri, 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.