Alert archive / Louisiana / Mesoscale Discussions in 2017
Mesoscale Discussion 1594
The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2017, 6:49 PM CDT for 22 parishes in Louisiana; Jefferson County, Orange County, Texas. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2017, 6:49 PM CDT (23:49 UTC)
- Expired
- Aug 28, 2017, 8:45 PM CDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
All 24 counties
Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, Jefferson County, TX, Orange County, TX
The radar
The Lake Charles radar (KLCH), 107 km from the middle of the area, began a volume at 23:53 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 12:00Z, 11.8 hours before the alert went out and 105 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
- 169 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 610 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 377 m²/s²
- 0-3 km storm-relative helicity
- 499 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
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 27, 9:50 PM CDT | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, Jefferson Davis, Vermilion | 115 min |
| Aug 28, 1:51 AM CDT | Tornado Watch | SPC | Acadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Vermilion | 10 hr |
| Aug 28, 11:37 AM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, Iberia and 13 more | 83 min |
| Aug 28, 12:16 PM CDT | Tornado Watch | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 20 more | 12 hr |
| Aug 28, 3:58 PM CDT | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Lafayette and 3 more | 92 min |
| Aug 27, 7:45 PM CDT | Mesoscale Discussion | SPC | Carson, Dallam, Hansford, Hartley, Hutchinson, Moore and 3 more | 2 hr |
| Aug 28, 3:00 AM CDT | Mesoscale Discussion | SPC | Jefferson | 60 min |
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.