Alert archive / Mississippi / Mesoscale Discussions in 2022

Mesoscale Discussion 484

April 13, 2022Desha County, Drew County, Phillips County, Arkansas; 22 counties in Mississippi; McNairy County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2022, 5:00 PM CDT for Desha County, Drew County, Phillips County, Arkansas; 22 counties in Mississippi; McNairy County, Tennessee. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2022, 5:00 PM CDT (22:00 UTC)
Expired
Apr 13, 2022, 6:30 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 122
All 26 counties

Desha County, AR, Drew County, AR, Phillips County, AR, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, McNairy County, TN

The radar

The Memphis radar (KNQA), 101 km from the middle of the area, began a volume at 22:04 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 nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 10.0 hours before the alert went out and 52 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, Little Rock, AR at 12:00Z on 2022-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 141 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, Little Rock, AR at 12:00Z on 2022-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 336 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
141 J/kg
Mixed-layer CIN
-450 J/kg
Mixed-layer LCL
565 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
336 m²/s²
0-3 km storm-relative helicity
627 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.7

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, 3:36 PM CDTMesoscale DiscussionSPCChicot84 min
Apr 13, 6:29 PM CDTMesoscale DiscussionSPCAdams, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 31 more91 min
Apr 13, 4:48 PM CDTMesoscale DiscussionSPCBenton, Carroll, Cheatham, Chester, Crockett, Davidson and 23 more117 min
Apr 13, 5:01 PM CDTTornado WatchSPCBedford, Cheatham, Clay, Davidson, Dickson, Giles and 20 more4 hr
Apr 13, 6:44 PM CDTSevere Thunderstorm WatchSPCLincoln, Moore4 hr

Nearby

Mesoscale Discussions in Mississippi, 2022Mesoscale Discussions in Arkansas, 2022Mesoscale Discussions in Tennessee, 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.