Alert archive / Louisiana / Mesoscale Discussions in 2017
Mesoscale Discussion 411
The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2017, 8:07 PM CDT for 14 parishes in Louisiana; Jefferson County, Orange County, Texas. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Apr 2, 2017, 8:07 PM CDT (01:07 UTC)
- Expired
- Apr 2, 2017, 9:30 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
Counties Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA, Jefferson County, TX, Orange County, TX
The radar
The Lake Charles radar (KLCH), 46 km from the middle of the area, began a volume at 01:08 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 1.1 hours before the alert went out and 46 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
- 2242 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 522 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 224 m²/s²
- 0-3 km storm-relative helicity
- 281 m²/s²
- Significant tornado parameter
- 4.2
- Supercell composite
- 14.7
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 2, 8:24 PM CDT | Tornado Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more | 6 hr |
| Apr 2, 9:09 PM CDT | Mesoscale Discussion | SPC | Catahoula, Concordia, East Baton Rouge, East Feliciana, Livingston, Madison and 8 more | 2 hr |
| Apr 2, 11:37 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Avoyelles, East Baton Rouge, East Feliciana and 18 more | 83 min |
| Apr 3, 1:48 AM CDT | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Jefferson, Lafourche and 12 more | 10 hr |
| Apr 3, 3:59 AM CDT | Mesoscale Discussion | SPC | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 6 more | 2 hr |
| Apr 3, 6:43 AM CDT | Mesoscale Discussion | SPC | Plaquemines, Saint Bernard | 2 hr |
Nearby
Mesoscale 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.