Alert archive / Mississippi / Mesoscale Discussions in 2015

Mesoscale Discussion 2095

December 28, 20157 counties in Arkansas; 25 parishes in Louisiana; 55 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 28, 2015, 2:03 AM CST for 7 counties in Arkansas; 25 parishes in Louisiana; 55 counties in Mississippi. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Dec 28, 2015, 2:03 AM CST (08:03 UTC)
Expired: Dec 28, 2015, 4:00 AM CST
In force: 117 min
Issued by: the Storm Prediction Center

All 87 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Phillips County, AR, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Richland Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Carroll Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Clarke County, MS, Coahoma County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Grenada County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jackson County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Sunflower County, MS, Tallahatchie County, MS, Tunica County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Wayne County, MS, Wilkinson County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 78 km from the middle of the area, began a volume at 08:05 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 574Dec 28, 2:25 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 8.1 hours before the alert went out and 78 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, 2:23 AM CST	Tornado Watch	SPC	Lee, Phillips	8 hr
Dec 28, 5:14 AM CST	Mesoscale Discussion	SPC	Crittenden, Cross, Lee, Mississippi, Monroe, Phillips and 3 more	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2015 Mesoscale Discussions in Louisiana, 2015 Mesoscale Discussions in Arkansas, 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.