Alert archive / Texas / Mesoscale Discussions in 2020
Mesoscale Discussion 436
The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2020, 10:38 AM CDT for 6 parishes in Louisiana; 56 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2020, 10:38 AM CDT (15:38 UTC)
- Expired
- Apr 22, 2020, 12:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 62 counties
Caddo Parish, LA, De Soto Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Anderson County, TX, Angelina County, TX, Austin County, TX, Bastrop County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Cherokee County, TX, Coryell County, TX, Ellis County, TX, Falls County, TX, Fayette County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Harrison County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Houston County, TX, Jasper County, TX, Kaufman County, TX, Lampasas County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Navarro County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Travis County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Williamson County, TX, Wood County, TX
The radar
The Ft Hood radar (KGRK), 136 km from the middle of the area, began a volume at 15:40 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
Fort Worth, TX (KFWD), launched 12:00Z, 3.6 hours before the alert went out and 216 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
- 247 J/kg
- Mixed-layer CIN
- -372 J/kg
- Mixed-layer LCL
- 679 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 349 m²/s²
- 0-3 km storm-relative helicity
- 308 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.5
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, 10:55 AM CDT | Tornado Watch | SPC | Allen, Beauregard, De Soto, Evangeline, Grant, Natchitoches and 4 more | 6 hr |
| Apr 22, 1:10 PM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, De Soto, Evangeline, Grant and 6 more | 65 min |
| Apr 22, 2:53 PM CDT | Mesoscale Discussion | SPC | Bienville, De Soto, Grant, LaSalle, Natchitoches, Rapides and 4 more | 67 min |
| Apr 22, 4:24 PM CDT | Mesoscale Discussion | SPC | Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 16 more | 96 min |
| Apr 22, 5:01 PM CDT | Tornado Watch | SPC | Allen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 17 more | 9 hr |
| Apr 22, 6:47 PM CDT | Mesoscale Discussion | SPC | Concordia, Saint Helena, Tensas, Washington | 88 min |
| Apr 21, 8:12 PM CDT | Mesoscale Discussion | SPC | Hemphill, Lipscomb, Wheeler | 63 min |
| Apr 22, 1:21 AM CDT | Mesoscale Discussion | SPC | Fannin, Lamar, Red River | 84 min |
| Apr 22, 1:46 AM CDT | Severe Thunderstorm Watch | SPC | Fannin, Lamar, Red River | 4 hr |
| Apr 22, 2:16 AM CDT | Mesoscale Discussion | SPC | Carson, Dallam, Hansford, Hartley, Hemphill, Hutchinson and 7 more | 119 min |
| Apr 22, 1:12 PM CDT | Mesoscale Discussion | SPC | Clay, Collin, Cooke, Dallas, Delta, Denton and 15 more | 63 min |
| Apr 22, 2:33 PM CDT | Tornado Watch | SPC | Collin, Cooke, Dallas, Delta, Denton, Fannin and 12 more | 6 hr |
| Apr 22, 4:43 PM CDT | Mesoscale Discussion | SPC | Grayson | 62 min |
| Apr 22, 4:47 PM CDT | Mesoscale Discussion | SPC | Angelina, Polk, San Augustine, San Jacinto, Trinity, Tyler and 1 more | 88 min |
| Apr 22, 5:38 PM CDT | Mesoscale Discussion | SPC | Camp, Collin, Dallas, Delta, Fannin, Franklin and 10 more | 97 min |
| Apr 22, 5:53 PM CDT | Mesoscale Discussion | SPC | Angelina, Polk, Trinity, Tyler | 37 min |
| Apr 22, 6:39 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Marion, Morris, Red River and 2 more | 66 min |
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.