Alert archive / Mississippi / Mesoscale Discussions in 2023

Mesoscale Discussion 1122

June 17, 20234 states

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2023, 10:03 AM CDT for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2023, 10:03 AM CDT (15:03 UTC)
Expired: Jun 17, 2023, 12:00 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch likely
Chance of a watch: 80%

All 38 counties

Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington Parish, LA, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 79 km from the middle of the area, began a volume at 15:07 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.

Severe Thunderstorm Watch 323Jun 17, 12:55 PM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.1 hours before the alert went out and 149 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: 3160 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 8.6

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
Jun 16, 8:40 PM CDT	Mesoscale Discussion	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 11 more	2 hr
Jun 16, 11:18 PM CDT	Mesoscale Discussion	SPC	Baldwin, Escambia, Mobile, Washington	87 min
Jun 17, 12:55 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Choctaw, Clarke, Conecuh, Covington, Escambia and 6 more	7 hr
Jun 17, 3:44 PM CDT	Mesoscale Discussion	SPC	Baldwin, Clarke, Coffee, Conecuh, Covington, Escambia and 4 more	91 min
Jun 17, 5:53 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Calhoun, Chambers and 21 more	2 hr
Jun 17, 6:18 PM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Coffee, Conecuh, Covington and 6 more	117 min
Jun 17, 10:43 AM CDT	Mesoscale Discussion	SPC	Brevard, Broward, DeSoto, Glades, Hardee, Hendry and 10 more	92 min
Jun 17, 5:13 PM CDT	Mesoscale Discussion	SPC	Avoyelles, Bienville, Bossier, Caddo, Caldwell, Catahoula and 18 more	2 hr

Nearby

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