Alert archive / Mississippi / Mesoscale Discussions in 2026
Mesoscale Discussion 621
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2026, 3:02 PM CDT for 7 counties in Alabama; 6 parishes in Louisiana; 35 counties in Mississippi. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2026, 3:02 PM CDT (20:02 UTC)
- Expired
- Apr 29, 2026, 5:00 PM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 181
All 48 counties
Choctaw County, AL, Clarke County, AL, Marengo County, AL, Monroe County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, Concordia Parish, LA, Franklin Parish, LA, Madison Parish, LA, Richland Parish, LA, Tensas Parish, LA, Washington Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hinds County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 63 km from the middle of the area, began a volume at 20:02 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
Jackson, MS (KJAN), launched 12:00Z, 8.0 hours before the alert went out and 70 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.
- Mixed-layer CAPE
- 1134 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 569 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 277 m²/s²
- 0-3 km storm-relative helicity
- 263 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 9.4
The text
As transmitted.
646
ACUS11 KWNS 292002
SWOMCD
SPC MCD 292002
ALZ000-MSZ000-LAZ000-292200-
Mesoscale Discussion 0621
NWS Storm Prediction Center Norman OK
0302 PM CDT Wed Apr 29 2026
Areas affected...northeast Louisiana...central and southern
Mississippi...and southwest Alabama
Concerning...Severe Thunderstorm Watch 181...
Valid 292002Z - 292200Z
The severe weather threat for Severe Thunderstorm Watch 181
continues.
SUMMARY...The potential for more widespread wind damage is expected
to increase across portions of central and southern Mississippi into
southwest Alabama over the next 2-3 hours.
DISCUSSION...A west-to-east-oriented band of strong to severe storms
is ongoing just south of the I-20 corridor in MS and northeast LA as
of 20z. Occurrences of hail to 1" and thunderstorm wind damage have
been reported in the Jackson, MS vicinity within the past hour.
Additional elevated storms ongoing to the west of the watch area
across northern LA are expected to merge with the predominant band
of storms over the next hour, which should enhance overall cold pool
strength. That process may lead to an accelerated southeastward
motion of the convective band from central into southern MS and
southwest AL with an attendant risk for more widespread damaging
winds.
Isolated occurrences of large hail will remain possible, especially
on the western flank of the convective system where mid-level lapse
rates are steeper.
..Mead.. 04/29/2026
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...BMX...MOB...JAN...LIX...
LAT...LON 32069181 32549174 32809096 32718925 32598742 31718710
31098772 30768818 30738956 30819015 31099097 31389169
32069181
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 INSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 12:00 PM CDT | Mesoscale Discussion | SPC | Choctaw, Clarke, Sumter, Washington | 2 hr |
| Apr 29, 1:19 PM CDT | Severe Thunderstorm Watch | SPC | Autauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 12 more | 8 hr |
| Apr 29, 5:43 PM CDT | Mesoscale Discussion | SPC | Baldwin, Conecuh, Covington, Escambia, Mobile, Monroe and 1 more | 2 hr |
| Apr 29, 6:26 PM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Cullman, DeKalb and 13 more | 2 hr |
| Apr 28, 8:23 PM CDT | Mesoscale Discussion | SPC | East Carroll, Morehouse, West Carroll | 2 hr |
| Apr 28, 9:41 PM CDT | Tornado Watch | SPC | East Carroll | 4 hr |
| Apr 29, 10:21 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 6 more | 114 min |
| Apr 29, 11:16 AM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more | 10 hr |
| Apr 29, 1:37 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Grant and 8 more | 113 min |
| Apr 29, 5:20 PM CDT | Mesoscale Discussion | SPC | Allen, Avoyelles, Caldwell, Catahoula, Concordia, De Soto and 9 more | 115 min |
| Apr 28, 7:29 PM CDT | Mesoscale Discussion | SPC | Coahoma, Tunica | 2 hr |
| Apr 28, 9:24 PM CDT | Mesoscale Discussion | SPC | Attala, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 27 more | 2 hr |
| Apr 28, 11:25 PM CDT | Mesoscale Discussion | SPC | Bolivar, Coahoma, Leflore, Quitman, Sunflower, Tallahatchie and 1 more | 2 hr |
Nearby
Mesoscale Discussions in Mississippi, 2026Mesoscale Discussions in Alabama, 2026Mesoscale Discussions in Louisiana, 2026Every mesoscale discussion in 2026
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.