Alert archive / Mississippi / Mesoscale Discussions in 2017
Mesoscale Discussion 566
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2017, 7:02 PM CDT for 16 parishes in Louisiana; 20 counties in Mississippi. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2017, 7:02 PM CDT (00:02 UTC)
- Expired
- Apr 26, 2017, 8:30 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 36 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, West Feliciana Parish, LA, Adams County, MS, Attala County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Rankin County, MS, Sharkey County, MS, Warren County, MS, Wilkinson County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 96 km from the middle of the area, began a volume at 00:06 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.
The nearest sounding before it
Jackson, MS (KJAN), launched 00:00Z, 0.0 hours before the alert went out and 86 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
- 448 J/kg
- Mixed-layer CIN
- -135 J/kg
- Mixed-layer LCL
- 1294 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.1
- 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 |
|---|---|---|---|---|
| Apr 26, 7:36 PM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, Calhoun, Chickasaw, Clay, Grenada and 12 more | 84 min |
| Apr 26, 9:01 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Attala, Choctaw, Claiborne, Clarke, Clay and 29 more | 5 hr |
| Apr 26, 11:57 PM CDT | Mesoscale Discussion | SPC | Covington, Jones | 93 min |
| Apr 27, 1:36 AM CDT | Mesoscale Discussion | SPC | Clarke, Forrest, Greene, Jasper, Jones, Lauderdale and 2 more | 114 min |
Nearby
Mesoscale Discussions in Mississippi, 2017Mesoscale Discussions in Louisiana, 2017Every mesoscale discussion in 2017
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.