Alert archive / Mississippi / Mesoscale Discussions in 2018
Mesoscale Discussion 829
The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2018, 6:05 PM CDT for 8 parishes in Louisiana; 20 counties in Mississippi. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Jun 22, 2018, 6:05 PM CDT (23:05 UTC)
- Expired
- Jun 22, 2018, 8:00 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 28 counties
East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Hinds County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lauderdale County, MS, Lawrence County, MS, Madison County, MS, Newton County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Wayne County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 73 km from the middle of the area, began a volume at 23:08 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, 11.1 hours before the alert went out and 64 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.
- 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
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 8:42 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caldwell, Claiborne, East Carroll, Franklin and 14 more | 93 min |
| Jun 22, 10:55 AM CDT | Severe Thunderstorm Watch | SPC | Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 13 more | 10 hr |
| Jun 22, 3:03 PM CDT | Mesoscale Discussion | SPC | Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 14 more | 87 min |
| Jun 21, 8:30 PM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, DeSoto, Lafayette, Marshall, Panola and 6 more | 2 hr |
| 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, 2018Mesoscale Discussions in Louisiana, 2018Every 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.