Alert archive / Alabama / Mesoscale Discussions in 2023

Mesoscale Discussion 22

January 3, 202313 counties in Alabama; Clarke County, Jones County, Wayne County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 3, 2023, 11:38 AM CST for 13 counties in Alabama; Clarke County, Jones County, Wayne County, Mississippi. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jan 3, 2023, 11:38 AM CST (17:38 UTC)
Expired: Jan 3, 2023, 1:15 PM CST
In force: 97 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 7

Counties Bibb County, AL, Choctaw County, AL, Clarke County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Wilcox County, AL, Clarke County, MS, Jones County, MS, Wayne County, MS

The radar

The Birmingham radar (KBMX), 158 km from the middle of the area, began a volume at 17:43 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

Birmingham, AL (KBMX), launched 12:00Z, 5.6 hours before the alert went out and 158 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 169 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 620 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 318 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

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.

Issued	Product	Office	Counties	Lasted
Jan 3, 7:56 AM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Lawrence, Limestone, Marion	2 hr
Jan 3, 9:14 AM CST	Tornado Watch	SPC	Autauga, Bibb, Blount, Chilton, Choctaw, Clarke and 30 more	8 hr
Jan 3, 12:29 PM CST	Mesoscale Discussion	SPC	Autauga, Bullock, Butler, Calhoun, Chambers, Cherokee and 15 more	91 min
Jan 3, 12:56 PM CST	Tornado Watch	SPC	Barbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 13 more	7 hr
Jan 3, 2:07 PM CST	Mesoscale Discussion	SPC	Autauga, Calhoun, Chambers, Chilton, Clarke, Clay and 13 more	113 min
Jan 3, 2:54 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Coffee, Conecuh, Covington and 8 more	2 hr
Jan 3, 3:20 PM CST	Tornado Watch	SPC	Butler, Coffee, Conecuh, Covington, Crenshaw, Dale and 4 more	5 hr
Jan 2, 6:29 PM CST	Tornado Watch	SPC	Bolivar, Washington	9 hr
Jan 2, 8:31 PM CST	Mesoscale Discussion	SPC	Bolivar, Coahoma, DeSoto, Humphreys, Issaquena, Leflore and 8 more	89 min
Jan 2, 10:11 PM CST	Tornado Watch	SPC	Coahoma, DeSoto, Marshall, Panola, Quitman, Tate and 1 more	5 hr
Jan 2, 11:17 PM CST	Mesoscale Discussion	SPC	Bolivar, Coahoma, DeSoto, Panola, Quitman, Sunflower and 4 more	118 min
Jan 3, 1:36 AM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Coahoma and 24 more	114 min
Jan 3, 2:56 AM CST	Tornado Watch	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 30 more	8 hr
Jan 3, 5:01 PM CST	Severe Thunderstorm Watch	SPC	Adams, Amite, Attala, Choctaw, Claiborne, Clarke and 38 more	9 hr

Nearby

Mesoscale Discussions in Alabama, 2023 Mesoscale Discussions in Mississippi, 2023 Every 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.