Alert archive / Louisiana / Mesoscale Discussions in 2020
Mesoscale Discussion 449
The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2020, 7:41 PM CDT for Vernon Parish, Louisiana; Newton County, Texas. It was in force for 34 min.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2020, 7:41 PM CDT (00:41 UTC)
- Expired
- Apr 22, 2020, 8:15 PM CDT
- In force
- 34 min
- Issued by
- the Storm Prediction Center
Counties Vernon Parish, LA, Newton County, TX
The radar
The Ft Polk radar (KPOE), 49 km from the middle of the area, began a volume at 00:44 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, 0.7 hours before the alert went out and 99 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
- 2355 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 548 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 302 m²/s²
- Significant tornado parameter
- 4.7
- Supercell composite
- 15.7
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 22, 7:01 PM CDT | Mesoscale Discussion | SPC | Beauregard, Vernon | 89 min |
| Apr 22, 8:26 PM CDT | Mesoscale Discussion | SPC | De Soto, Natchitoches, Sabine | 94 min |
| Apr 22, 9:31 PM CDT | Mesoscale Discussion | SPC | Avoyelles, Concordia, East Feliciana, Pointe Coupee, Saint Helena, Washington and 1 more | 89 min |
| Apr 22, 9:47 PM CDT | Tornado Watch | SPC | Ascension, Catahoula, Concordia, East Baton Rouge, East Feliciana, Franklin and 12 more | 9 hr |
| Apr 22, 10:17 PM CDT | Mesoscale Discussion | SPC | Caldwell, Grant, LaSalle, Natchitoches, Sabine, Winn | 88 min |
| Apr 22, 11:16 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 15 more | 89 min |
| Apr 23, 12:02 AM CDT | Tornado Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Evangeline and 5 more | 4 hr |
| Apr 23, 2:28 AM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Avoyelles, Concordia, East Baton Rouge, East Feliciana and 17 more | 92 min |
| Apr 23, 1:37 PM CDT | Mesoscale Discussion | SPC | Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 3 more | 113 min |
| Apr 22, 7:00 PM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Franklin, Gregg, Marion and 6 more | 4 hr |
| Apr 22, 9:08 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Delta, Franklin, Harrison and 10 more | 97 min |
Nearby
Mesoscale Discussions in Louisiana, 2020Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020
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.