Alert archive / Mississippi / Mesoscale Discussions in 2018

Mesoscale Discussion 826

June 22, 2018Ashley County, Columbia County, Union County, Arkansas; 20 parishes in Louisiana; 21 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2018, 3:03 PM CDT for Ashley County, Columbia County, Union County, Arkansas; 20 parishes in Louisiana; 21 counties in Mississippi. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jun 22, 2018, 3:03 PM CDT (20:03 UTC)
Expired: Jun 22, 2018, 4:30 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 44 counties

Ashley County, AR, Columbia County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Lincoln County, MS, Madison County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Wilkinson County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 161 km from the middle of the area, began a volume at 20:07 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 12:00Z, 8.1 hours before the alert went out and 152 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: 1953 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 515 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.1

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
Jun 21, 8:30 PM CDT	Mesoscale Discussion	SPC	Crittenden, Cross, St. Francis	2 hr
Jun 22, 8:42 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Columbia, Drew and 2 more	93 min
Jun 22, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	Columbia, Union	10 hr
Jun 22, 6:05 PM CDT	Mesoscale Discussion	SPC	East Carroll, Franklin, Madison, Morehouse, Ouachita, Richland and 2 more	115 min
Jun 22, 9:09 AM CDT	Mesoscale Discussion	SPC	Calhoun, Carroll, Chickasaw, Choctaw, Clay, Grenada and 15 more	96 min
Jun 22, 12:35 PM CDT	Mesoscale Discussion	SPC	Chickasaw, Clay, Itawamba, Lee, Lowndes, Monroe and 4 more	85 min

Nearby

Mesoscale Discussions in Mississippi, 2018 Mesoscale Discussions in Louisiana, 2018 Mesoscale Discussions in Arkansas, 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.