Alert archive / Mississippi / Mesoscale Discussions in 2017
Mesoscale Discussion 1600
The Storm Prediction Center issued this mesoscale discussion at Aug 30, 2017, 9:51 AM CDT for 10 parishes in Louisiana; 26 counties in Mississippi. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Aug 30, 2017, 9:51 AM CDT (14:51 UTC)
- Expired
- Aug 30, 2017, 11:45 AM CDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 36 counties
Catahoula Parish, LA, Concordia Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Saint Helena Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Washington Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Stone County, MS, Walthall County, MS, Wilkinson County, MS
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 12:00Z, 2.9 hours before the alert went out and 118 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
- 273 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 523 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 235 m²/s²
- 0-3 km storm-relative helicity
- 218 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.0
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 |
|---|---|---|---|---|
| Aug 30, 1:00 AM CDT | Mesoscale Discussion | SPC | Orleans, Saint Bernard, Saint John the Baptist, Saint Tammany, Tangipahoa, Washington | 90 min |
| Aug 30, 10:22 AM CDT | Tornado Watch | SPC | Catahoula, Concordia, East Carroll, East Feliciana, Franklin, Madison and 8 more | 8 hr |
| Aug 30, 2:55 PM CDT | Mesoscale Discussion | SPC | East Carroll, Madison | 2 hr |
| Aug 30, 5:50 PM CDT | Mesoscale Discussion | SPC | Avoyelles, Catahoula, Concordia, East Carroll, East Feliciana, Franklin and 8 more | 55 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.