Alert archive / Texas / Mesoscale Discussions in 2020
Mesoscale Discussion 327
The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2020, 5:20 PM CDT for 13 parishes in Louisiana; 25 counties in Texas. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Apr 9, 2020, 5:20 PM CDT (22:20 UTC)
- Expired
- Apr 9, 2020, 7:15 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 38 counties
Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Angelina County, TX, Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 82 km from the middle of the area, began a volume at 22:24 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, 10.3 hours before the alert went out and 128 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
- 1181 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1103 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 |
|---|---|---|---|---|
| Apr 9, 2:47 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis, Natchitoches and 3 more | 7 hr |
| Apr 9, 12:13 PM CDT | Mesoscale Discussion | SPC | Bandera, Bastrop, Bell, Blanco, Burnet, Caldwell and 19 more | 2 hr |
| Apr 9, 5:40 PM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 7 more | 2 hr |
| Apr 9, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Hidalgo, Jim Hogg, Starr, Zapata | 4 hr |
Nearby
Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Louisiana, 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.