Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 591
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2017, 9:19 AM CDT for 4 parishes in Louisiana; 6 counties in Texas. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2017, 9:19 AM CDT (14:19 UTC)
- Expired
- Apr 29, 2017, 11:15 AM CDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Beauregard Parish, LA, Calcasieu Parish, LA, Sabine Parish, LA, Vernon Parish, LA, 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), 72 km from the middle of the area, began a volume at 14:18 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 12:00Z, 2.3 hours before the alert went out and 109 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
- 3188 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 570 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 198 m²/s²
- 0-3 km storm-relative helicity
- 256 m²/s²
- Significant tornado parameter
- 2.9
- Supercell composite
- 14.9
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 29, 2:45 PM CDT | Mesoscale Discussion | SPC | Bienville, Caldwell, Franklin, Grant, Jackson, Lincoln and 9 more | 60 min |
| Apr 28, 10:18 PM CDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Cottle, Foard, Hall, Hardeman and 2 more | 117 min |
| Apr 28, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Childress, Collingsworth, Cottle, Dickens, Floyd, Foard and 6 more | 8 hr |
| Apr 29, 2:45 AM CDT | Mesoscale Discussion | SPC | Briscoe, Childress, Collingsworth, Cottle, Crosby, Dickens and 8 more | 2 hr |
| Apr 29, 2:10 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Denton, Ellis, Fannin, Grayson and 6 more | 2 hr |
| Apr 29, 5:10 PM CDT | Tornado Watch | SPC | Anderson, Camp, Cherokee, Delta, Fannin, Franklin and 18 more | 5 hr |
| Apr 29, 6:31 PM CDT | Mesoscale Discussion | SPC | Bastrop, Caldwell, Falls, Lee, Milam, Travis and 1 more | 59 min |
| Apr 29, 6:50 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Bastrop, Bell, Brazos, Burleson, Caldwell and 20 more | 4 hr |
Nearby
Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Louisiana, 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.