Alert archive / Alabama / Mesoscale Discussions in 2023
Mesoscale Discussion 29
The Storm Prediction Center issued this mesoscale discussion at Jan 3, 2023, 7:45 PM CST for 15 counties in Alabama; Kemper County, Lowndes County, Noxubee County, Mississippi. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Jan 3, 2023, 7:45 PM CST (01:45 UTC)
- Expired
- Jan 3, 2023, 9:15 PM CST
- In force
- 90 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 60%
Counties Bibb County, AL, Choctaw County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Marengo County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Kemper County, MS, Lowndes County, MS, Noxubee County, MS
The radar
The Columbus AFB radar (KGWX), 85 km from the middle of the area, began a volume at 01:47 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, 1.8 hours before the alert went out and 112 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
- 449 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 630 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 230 m²/s²
- 0-3 km storm-relative helicity
- 228 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 4.7
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 3, 10:05 PM CST | Tornado Watch | SPC | Autauga, Bibb, Blount, Butler, Chilton, Choctaw and 34 more | 6 hr |
| Jan 3, 11:37 PM CST | Mesoscale Discussion | SPC | Choctaw, Fayette, Greene, Hale, Lamar, Marengo and 6 more | 83 min |
| Jan 4, 2:06 AM CST | Mesoscale Discussion | SPC | Autauga, Barbour, Bullock, Butler, Calhoun, Chambers and 23 more | 114 min |
| Jan 4, 2:59 AM CST | Tornado Watch | SPC | Baldwin, Barbour, Bullock, Chambers, Clay, Coffee and 13 more | 7 hr |
| Jan 3, 9:19 PM CST | Mesoscale Discussion | SPC | Amite, Attala, Choctaw, Clay, Copiah, Covington and 19 more | 86 min |
Nearby
Mesoscale Discussions in Alabama, 2023Mesoscale Discussions in Mississippi, 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.