Alert archive / Mississippi / Mesoscale Discussions in 2023

Mesoscale Discussion 49

January 12, 20234 counties in Alabama; 10 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2023, 9:01 AM CST for 4 counties in Alabama; 10 counties in Mississippi. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jan 12, 2023, 9:01 AM CST (15:01 UTC)
Expired: Jan 12, 2023, 11:00 AM CST
In force: 119 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 17

Counties Greene County, AL, Hale County, AL, Sumter County, AL, Tuscaloosa County, AL, Clarke County, MS, Covington County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Newton County, MS, Simpson County, MS, Smith County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 121 km from the middle of the area, began a volume at 15:00 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, 3.0 hours before the alert went out and 130 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: 1054 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 365 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 8.1

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 12, 6:38 AM CST	Mesoscale Discussion	SPC	Bibb, Colbert, Cullman, Fayette, Franklin, Greene and 12 more	2 hr
Jan 12, 6:59 AM CST	Tornado Watch	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Colbert and 27 more	7 hr
Jan 12, 9:54 AM CST	Mesoscale Discussion	SPC	Bibb, Greene, Hale, Marengo, Perry, Sumter	96 min
Jan 12, 10:20 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 12 more	7 hr
Jan 12, 10:52 AM CST	Mesoscale Discussion	SPC	Bullock, Calhoun, Chambers, Cherokee, Clay, Cleburne and 7 more	53 min
Jan 12, 11:36 AM CST	Mesoscale Discussion	SPC	Autauga, Chilton, Coosa, Dallas, Perry	84 min
Jan 12, 12:06 PM CST	Tornado Watch	SPC	Barbour, Bullock, Chambers, Clay, Cleburne, Lee and 5 more	8 hr
Jan 12, 1:00 PM CST	Mesoscale Discussion	SPC	Elmore, Tallapoosa	60 min
Jan 12, 1:19 PM CST	Mesoscale Discussion	SPC	Barbour, Coffee, Dale, Geneva, Henry, Houston	116 min
Jan 12, 1:55 PM CST	Mesoscale Discussion	SPC	Colbert, Lauderdale, Lawrence, Limestone, Madison, Morgan	65 min
Jan 12, 2:01 PM CST	Mesoscale Discussion	SPC	Chambers	119 min
Jan 12, 2:06 PM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 4 more	114 min
Jan 12, 2:36 PM CST	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	6 hr
Jan 12, 3:43 PM CST	Mesoscale Discussion	SPC	Barbour, Dale, Henry	92 min
Jan 12, 3:07 AM CST	Mesoscale Discussion	SPC	Adams, Attala, Carroll, Choctaw, Claiborne, Copiah and 19 more	3 hr

Nearby

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