Alert archive / Mississippi / Mesoscale Discussions in 2015

Mesoscale Discussion 947

June 8, 201519 counties in Alabama; 21 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2015, 4:54 PM CDT for 19 counties in Alabama; 21 counties in Mississippi. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jun 8, 2015, 4:54 PM CDT (21:54 UTC)
Expired: Jun 8, 2015, 6:30 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 40 counties

Blount County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Clay County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Tallahatchie County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 24 km from the middle of the area, began a volume at 21:56 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

Little Rock, AR (KBYH), launched 12:00Z, 9.9 hours before the alert went out and 170 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: 813 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1302 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

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Nearby

Mesoscale Discussions in Mississippi, 2015 Mesoscale Discussions in Alabama, 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.