Alert archive / Mississippi / Mesoscale Discussions in 2017
Mesoscale Discussion 1786
The Storm Prediction Center issued this mesoscale discussion at Dec 8, 2017, 3:36 AM CST for 19 parishes in Louisiana; 24 counties in Mississippi; Jasper County, Newton County, Orange County, Texas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 8, 2017, 3:36 AM CST (09:36 UTC)
- Expired
- Dec 8, 2017, 7:30 AM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 46 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Vernon Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Neshoba County, MS, Newton County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Wilkinson County, MS, Jasper County, TX, Newton County, TX, Orange County, TX
The radar
The Ft Polk radar (KPOE), 122 km from the middle of the area, began a volume at 09:37 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
Lake Charles Mun, LA (KLCH), launched 00:00Z, 9.6 hours before the alert went out and 200 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
- 1 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 753 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- -125 m²/s²
- 0-3 km storm-relative helicity
- 326 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Dec 8, 7:55 AM CST | Mesoscale Discussion | SPC | Kemper, Lauderdale, Lowndes, Noxubee | 3 hr |
| Dec 7, 8:07 PM CST | Mesoscale Discussion | SPC | Bastrop, Brazos, Burleson, Caldwell, Fayette, Grimes and 3 more | 113 min |
| Dec 8, 1:38 AM CST | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Harris and 9 more | 3 hr |
Nearby
Mesoscale Discussions in Mississippi, 2017Mesoscale Discussions in Louisiana, 2017Mesoscale Discussions in Texas, 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.