Alert archive / Mississippi / Mesoscale Discussions in 2018

Mesoscale Discussion 1624

November 5, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Nov 5, 2018, 9:28 PM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 5, 2018, 9:28 PM CST (03:28 UTC)
Expired: Nov 5, 2018, 11:30 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 59 counties

Lauderdale County, AL, Caldwell Parish, LA, Catahoula Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Warren County, MS, Washington County, MS, Yalobusha County, MS, Yazoo County, MS, Chester County, TN, Decatur County, TN, Dickson County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, Hickman County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Maury County, TN, McNairy County, TN, Perry County, TN, Wayne County, TN, Williamson County, TN

The radar

The Jackson/Brandon,MS radar (KDGX), 151 km from the middle of the area, began a volume at 03:31 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.

Tornado Watch 424Nov 5, 10:30 PM CST

The nearest sounding before it

Little Rock, AR (KBYH), launched 00:00Z, 3.5 hours before the alert went out and 141 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: 22 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 602 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Nov 5, 10:30 PM CST	Tornado Watch	SPC	Blount, Colbert, Cullman, DeKalb, Fayette, Franklin and 16 more	7 hr
Nov 5, 11:31 PM CST	Mesoscale Discussion	SPC	Pickens, Tuscaloosa	59 min
Nov 6, 1:40 AM CST	Mesoscale Discussion	SPC	DeKalb	65 min
Nov 5, 7:04 PM CST	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	8 hr
Nov 6, 2:15 AM CST	Tornado Watch	SPC	Anderson, Blount, Bradley, Campbell, Knox, Loudon and 8 more	5 hr

Nearby

Mesoscale Discussions in Mississippi, 2018 Mesoscale Discussions in Louisiana, 2018 Mesoscale Discussions in Tennessee, 2018 Every mesoscale discussion in 2018

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.