Alert archive / Alabama / Mesoscale Discussions in 2022
Mesoscale Discussion 13
The Storm Prediction Center issued this mesoscale discussion at Jan 1, 2022, 6:02 PM CST for 25 counties in Alabama; 13 counties in Mississippi. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Jan 1, 2022, 6:02 PM CST (00:02 UTC)
- Expired
- Jan 1, 2022, 8:00 PM CST
- In force
- 118 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 4...5...6
All 38 counties
Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Itawamba County, MS, Kemper County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Webster County, MS, Winston County, MS
The radar
The Columbus AFB radar (KGWX), 82 km from the middle of the area, began a volume at 00:02 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 0.0 hours before the alert went out and 94 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
- 227 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 965 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 362 m²/s²
- 0-3 km storm-relative helicity
- 462 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.6
The text
As transmitted.
058
ACUS11 KWNS 020002
SWOMCD
SPC MCD 020002
ALZ000-MSZ000-020200-
Mesoscale Discussion 0013
NWS Storm Prediction Center Norman OK
0602 PM CST Sat Jan 01 2022
Areas affected...parts of eastern MS and northern to west-central AL
Concerning...Tornado Watch 4...5...6...
Valid 020002Z - 020200Z
The severe weather threat for Tornado Watch 4, 5, 6 continues.
SUMMARY...The Risk of a few tornadoes, damaging wind gusts, and
isolated large hail may increase during the next few hours.
DISCUSSION...A mix of multicell clusters and transient supercell
structures should continue tracking east-northeastward from eastern
MS across parts of northern to west-central AL during the next few
hours. Here, a moist airmass (middle/upper 60s dewpoints) is
contributing to around 1000 J/kg MLCAPE where the latest VWPs show
0-6 km bulk shear of 60-70 knots. While storms have struggled across
the warm sector thus far owing to limited large-scale forcing for
ascent and weak low-level convergence, a low-level jet is expected
to overspread the area which may support a few longer-lived
multicell clusters and supercells over the next few hours. The
latest VWPs from GWX and HTX show 0-1 km SRH values of 250-300 m2/s2
ahead of the ongoing convection, which will support a risk of a few
tornadoes, damaging wind gusts, and isolated large hail with any
sustained supercells or intense multicells across the area.
..Weinman.. 01/02/2022
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...BMX...HUN...MEG...JAN...
LAT...LON 34678721 34658632 34558567 34368548 34008557 33458602
32808714 32378807 32538918 33098949 33618944 34188906
34578833 34678721SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 1, 6:53 PM CST | Tornado Watch | SPC | Cullman, DeKalb, Franklin, Jackson, Lawrence, Limestone and 3 more | 7 hr |
| Jan 1, 8:30 PM CST | Mesoscale Discussion | SPC | Jackson | 60 min |
| Jan 1, 9:11 PM CST | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Cullman, DeKalb and 17 more | 64 min |
| Jan 1, 10:07 PM CST | Tornado Watch | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 25 more | 6 hr |
| Jan 1, 11:19 PM CST | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Choctaw and 17 more | 116 min |
| Jan 2, 2:19 AM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Calhoun, Chambers, Chilton, Choctaw and 17 more | 116 min |
| Jan 2, 10:37 AM CST | Mesoscale Discussion | SPC | Coffee, Covington, Dale, Geneva, Henry, Houston | 83 min |
| Jan 2, 12:53 PM CST | Mesoscale Discussion | SPC | Coffee, Dale, Geneva, Henry, Houston | 2 hr |
| Jan 2, 1:17 PM CST | Tornado Watch | SPC | Geneva, Henry, Houston | 9 hr |
Nearby
Mesoscale Discussions in Alabama, 2022Mesoscale Discussions in Mississippi, 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.