Alert archive / Arkansas / Mesoscale Discussions in 2024

Mesoscale Discussion 49

January 12, 202427 counties in Arkansas; 7 parishes in Louisiana; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2024, 2:41 AM CST for 27 counties in Arkansas; 7 parishes in Louisiana; 16 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Jan 12, 2024, 2:41 AM CST (08:41 UTC)
Expired
Jan 12, 2024, 4:15 AM CST
In force
94 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 9
All 50 counties

Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Faulkner 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, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Webster Parish, LA, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Leon County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 101 km from the middle of the area, began a volume at 08:45 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, 8.7 hours before the alert went out and 95 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 2024-01-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 413 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 2024-01-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 289 square meters per square second.1939587897117136156Sfc1 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
413 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1157 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
289 m²/s²
0-3 km storm-relative helicity
493 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.8

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
Jan 11, 8:28 PM CSTMesoscale DiscussionSPCCalhoun, Clark, Cleburne, Cleveland, Columbia, Conway and 38 more2 hr
Jan 11, 9:56 PM CSTTornado WatchSPCBradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 34 more6 hr
Jan 11, 11:44 PM CSTMesoscale DiscussionSPCCalhoun, Clark, Columbia, Conway, Dallas, Faulkner and 19 more2 hr
Jan 12, 1:13 AM CSTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 3 more2 hr
Jan 12, 3:33 AM CSTMesoscale DiscussionSPCAshley, Chicot, Desha, Lee, Phillips87 min
Jan 12, 3:57 AM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 26 more7 hr
Jan 12, 6:14 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Chicot, Crittenden, Cross, Desha and 5 more91 min
Jan 12, 7:55 AM CSTMesoscale DiscussionSPCEast Carroll, Franklin, Madison, Tensas95 min

Nearby

Mesoscale Discussions in Arkansas, 2024Mesoscale Discussions in Texas, 2024Mesoscale Discussions in Louisiana, 2024Every mesoscale discussion in 2024

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.