Alert archive / Mississippi / Mesoscale Discussions in 2015

Mesoscale Discussion 2098

December 28, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Dec 28, 2015, 5:14 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Dec 28, 2015, 5:14 AM CST (11:14 UTC)
Expired: Dec 28, 2015, 7:15 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 79 counties

Crittenden County, AR, Cross County, AR, Lee County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Woodruff County, AR, Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, Washington Parish, LA, Attala County, MS, Benton County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Coahoma County, MS, Covington County, MS, DeSoto County, MS, Forrest County, MS, Grenada County, MS, Hancock County, MS, Harrison County, MS, Holmes County, MS, Humphreys County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lafayette County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Marion County, MS, Marshall County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Oktibbeha County, MS, Panola County, MS, Pearl River County, MS, Perry County, MS, Pontotoc County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Walthall County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Hardeman County, TN, Haywood County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN

The radar

The Jackson/Brandon,MS radar (KDGX), 68 km from the middle of the area, began a volume at 11:17 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 00:00Z, 11.2 hours before the alert went out and 66 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: 1137 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 767 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 204 m²/s²
0-3 km storm-relative helicity: 306 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 27, 7:11 PM CST	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Columbia, Drew, Lafayette and 4 more	94 min
Dec 27, 8:59 PM CST	Mesoscale Discussion	SPC	Ashley, Chicot, Union	91 min
Dec 27, 9:57 PM CST	Tornado Watch	SPC	Ashley, Chicot, Columbia, Union	7 hr
Dec 27, 11:49 PM CST	Mesoscale Discussion	SPC	Ashley, Chicot, Union	86 min
Dec 28, 2:03 AM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Chicot, Desha, Drew and 1 more	117 min
Dec 28, 2:23 AM CST	Tornado Watch	SPC	Lee, Phillips	8 hr
Dec 28, 8:38 AM CST	Mesoscale Discussion	SPC	Bedford, Benton, Carroll, Cheatham, Chester, Davidson and 21 more	67 min

Nearby

Mesoscale Discussions in Mississippi, 2015 Mesoscale Discussions in Arkansas, 2015 Mesoscale Discussions in Tennessee, 2015 Every mesoscale discussion in 2015

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.