Alert archive / Arkansas / Mesoscale Discussions in 2023

Mesoscale Discussion 239

March 2, 202330 counties in Arkansas; 15 parishes in Louisiana; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2023, 9:53 PM CST for 30 counties in Arkansas; 15 parishes in Louisiana; 10 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Mar 2, 2023, 9:53 PM CST (03:53 UTC)
Expired
Mar 2, 2023, 11:30 PM CST
In force
97 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 57
All 55 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha 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, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike 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, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Bowie County, TX, Cass County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 68 km from the middle of the area, began a volume at 03:56 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, 3.9 hours before the alert went out and 61 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 2023-03-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 937 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 2023-03-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 321 square meters per square second.1939587897117136Sfc1 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
937 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
801 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
321 m²/s²
0-3 km storm-relative helicity
466 m²/s²
Significant tornado parameter
2.9
Supercell composite
16.6

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 2, 6:14 PM CSTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Conway, Crawford, Faulkner and 17 more2 hr
Mar 2, 6:54 PM CSTMesoscale DiscussionSPCCalhoun, Clark, Cleveland, Columbia, Dallas, Garland and 16 more96 min
Mar 2, 11:06 PM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 37 more54 min
Mar 2, 11:51 PM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 26 more8 hr
Mar 3, 12:26 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 7 more2 hr
Mar 2, 9:17 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 6 more118 min
Mar 2, 7:09 PM CSTMesoscale DiscussionSPCAustin, Bastrop, Caldwell, Colorado, Comal, Fayette and 8 more2 hr
Mar 2, 7:13 PM CSTMesoscale DiscussionSPCCamp, Collin, Dallas, Delta, Ellis, Fannin and 16 more92 min
Mar 2, 7:45 PM CSTSevere Thunderstorm WatchSPCAustin, Brazos, Burleson, Colorado, Fort Bend, Grimes and 12 more4 hr

Nearby

Mesoscale Discussions in Arkansas, 2023Mesoscale Discussions in Louisiana, 2023Mesoscale Discussions in Texas, 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.