Alert archive / Mississippi / Mesoscale Discussions in 2024

Mesoscale Discussion 2255

December 10, 20245 counties in Alabama; 5 parishes in Louisiana; 20 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 10, 2024, 5:34 AM CST for 5 counties in Alabama; 5 parishes in Louisiana; 20 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Dec 10, 2024, 5:34 AM CST (11:34 UTC)
Expired: Dec 10, 2024, 8:00 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

All 30 counties

Choctaw County, AL, Clarke County, AL, Marengo County, AL, Sumter County, AL, Washington County, AL, East Baton Rouge Parish, LA, Livingston Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, Greene County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wayne County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 109 km from the middle of the area, began a volume at 11:35 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.6 hours before the alert went out and 133 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: 232 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 318 m²/s²
0-3 km storm-relative helicity: 331 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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
Dec 10, 9:54 AM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Chambers, Chilton, Clay, Coosa and 9 more	96 min
Dec 10, 5:45 PM CST	Mesoscale Discussion	SPC	Barbour, Coffee, Dale, Geneva, Henry, Houston	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2024 Mesoscale Discussions in Alabama, 2024 Mesoscale Discussions in Louisiana, 2024 Every mesoscale discussion in 2024

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.