Alert archive / Louisiana / Mesoscale Discussions in 2017
Mesoscale Discussion 912
The Storm Prediction Center issued this mesoscale discussion at May 28, 2017, 9:16 PM CDT for 15 parishes in Louisiana; Adams County, Wilkinson County, Mississippi; 6 counties in Texas. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- May 28, 2017, 9:16 PM CDT (02:16 UTC)
- Expired
- May 28, 2017, 10:15 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 23 counties
Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Vernon Parish, LA, West Feliciana Parish, LA, Adams County, MS, Wilkinson County, MS, Hardin County, TX, Jasper County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, Tyler County, TX
The radar
The Ft Polk radar (KPOE), 30 km from the middle of the area, began a volume at 02:18 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, 2.3 hours before the alert went out and 94 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
- 2055 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 992 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| May 28, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Catahoula and 10 more | 6 hr |
| May 28, 7:34 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more | 56 min |
| May 28, 7:19 PM CDT | Mesoscale Discussion | SPC | Duval, Jim Hogg, La Salle, Live Oak, McMullen, Webb and 1 more | 56 min |
| May 28, 7:40 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 10 more | 8 hr |
| May 28, 9:41 PM CDT | Mesoscale Discussion | SPC | Brooks, Duval, Jim Hogg, Jim Wells, La Salle, Live Oak and 3 more | 64 min |
| May 29, 2:02 AM CDT | Mesoscale Discussion | SPC | Aransas, Brooks, Cameron, Duval, Hidalgo, Jim Wells and 6 more | 118 min |
Nearby
Mesoscale Discussions in Louisiana, 2017Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Mississippi, 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.