Alert archive / Louisiana / Mesoscale Discussions in 2022

Mesoscale Discussion 482

April 13, 2022Chicot County, Arkansas; 17 parishes in Louisiana; 16 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2022, 3:36 PM CDT for Chicot County, Arkansas; 17 parishes in Louisiana; 16 counties in Mississippi. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2022, 3:36 PM CDT (20:36 UTC)
Expired
Apr 13, 2022, 5:00 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 123
All 34 counties

Chicot County, AR, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Madison County, MS, Rankin County, MS, Sharkey County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

The radar

The Ft Polk radar (KPOE), 157 km from the middle of the area, began a volume at 20:39 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

Jackson, MS (KJAN), launched 12:00Z, 8.6 hours before the alert went out and 156 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, Jackson, MS at 12:00Z on 2022-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Jackson, MS at 12:00Z on 2022-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1394 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
411 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 12, 7:29 PM CDTTornado WatchSPCBradley, Calhoun, Columbia, Hempstead, Lafayette, Little River and 4 more7 hr
Apr 12, 9:39 PM CDTMesoscale DiscussionSPCCalhoun, Columbia, Hempstead, Lafayette, Little River, Miller and 3 more96 min
Apr 12, 11:11 PM CDTMesoscale DiscussionSPCAshley, Chicot2 hr
Apr 12, 11:21 PM CDTTornado WatchSPCAshley, Chicot4 hr
Apr 13, 7:05 AM CDTMesoscale DiscussionSPCCalhoun, Clark, Cleveland, Columbia, Dallas, Garland and 19 more2 hr
Apr 13, 10:07 AM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Conway and 23 more83 min
Apr 13, 10:37 AM CDTTornado WatchSPCBradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 36 more6 hr
Apr 13, 10:49 AM CDTMesoscale DiscussionSPCBaxter, Fulton, Marion56 min
Apr 13, 12:32 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 2 more118 min
Apr 13, 1:42 PM CDTTornado WatchSPCArkansas, Clay, Craighead, Crittenden, Cross, Desha and 9 more7 hr
Apr 13, 2:42 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 1 more63 min
Apr 13, 2:48 PM CDTTornado WatchSPCAshley, Chicot, Union8 hr
Apr 13, 5:00 PM CDTMesoscale DiscussionSPCDesha, Drew, Phillips90 min
Apr 13, 5:11 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 12 more2 hr
Apr 13, 5:25 PM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Evangeline and 4 more5 hr
Apr 13, 6:29 PM CDTMesoscale DiscussionSPCAvoyelles, Catahoula, Concordia, East Carroll, Franklin, Madison and 1 more91 min

Nearby

Mesoscale Discussions in Louisiana, 2022Mesoscale Discussions in Mississippi, 2022Mesoscale Discussions in Arkansas, 2022Every mesoscale discussion in 2022

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.