Alert archive / Mississippi / Mesoscale Discussions in 2015

Mesoscale Discussion 390

April 19, 20155 states

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2015, 10:16 PM CDT for 5 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2015, 10:16 PM CDT (03:16 UTC)
Expired: Apr 19, 2015, 11:15 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

All 97 counties

Chicot County, AR, Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Greene County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Avoyelles Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Dunklin County, MO, Pemiscot County, MO, Adams County, MS, Alcorn County, MS, Amite County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Coahoma County, MS, Copiah County, MS, DeSoto County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lafayette County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Pike County, MS, Pontotoc County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Yalobusha County, MS, Yazoo County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Jackson/Brandon,MS radar (KDGX), 117 km from the middle of the area, began a volume at 03:19 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, 3.3 hours before the alert went out and 109 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: 932 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1460 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.2

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
Apr 19, 7:09 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 32 more	2 hr
Apr 19, 9:41 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 32 more	64 min
Apr 19, 8:02 PM CDT	Tornado Watch	SPC	Avoyelles, Evangeline, Rapides, Vernon	5 hr
Apr 20, 12:45 AM CDT	Mesoscale Discussion	SPC	Kemper, Lowndes, Monroe, Newton, Noxubee	90 min
Apr 19, 8:21 PM CDT	Mesoscale Discussion	SPC	Mississippi, New Madrid	54 min
Apr 20, 1:09 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bedford, Bledsoe, Bradley, Campbell, Cannon and 35 more	4 hr
Apr 20, 2:36 AM CDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Bradley, Campbell, Cannon, Clay and 26 more	84 min

Nearby

Mesoscale Discussions in Mississippi, 2015 Mesoscale Discussions in Tennessee, 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.