Alert archive / Texas / Mesoscale Discussions in 2025
Mesoscale Discussion 899
The Storm Prediction Center issued this mesoscale discussion at May 20, 2025, 1:21 AM CDT for 4 states. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- May 20, 2025, 1:21 AM CDT (06:21 UTC)
- Expired
- May 20, 2025, 2:15 AM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch likely
- Chance of a watch
- 80%
All 67 counties
Calhoun County, AR, Clark County, AR, Columbia County, AR, Dallas County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Webster Parish, LA, Atoka County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 184 km from the middle of the area, began a volume at 06:24 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Shreveport, LA (KSHV), launched 00:00Z, 6.4 hours before the alert went out and 188 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
- 1177 J/kg
- Mixed-layer CIN
- -197 J/kg
- Mixed-layer LCL
- 1137 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 281 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.6
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 |
|---|---|---|---|---|
| May 19, 8:04 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Crawford, Franklin, Johnson, Logan and 6 more | 86 min |
| May 19, 10:42 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Cross and 26 more | 2 hr |
| May 20, 12:00 AM CDT | Severe Thunderstorm Watch | SPC | Sebastian | 3 hr |
| May 20, 1:57 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Clark, Cleburne, Cleveland, Columbia, Conway and 33 more | 5 hr |
| May 20, 4:21 AM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Cleburne, Cleveland, Columbia, Conway and 26 more | 54 min |
| May 20, 12:34 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clay and 29 more | 116 min |
| May 20, 1:09 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clay and 30 more | 8 hr |
| May 20, 3:13 PM CDT | Severe Thunderstorm Watch | SPC | Union | 6 hr |
| May 20, 3:33 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Chicot, Crittenden, Desha, Drew and 4 more | 117 min |
| May 20, 1:14 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caldwell, Claiborne, De Soto, East Carroll and 17 more | 2 hr |
| May 20, 5:08 PM CDT | Mesoscale Discussion | SPC | Madison | 2 hr |
| May 20, 5:50 PM CDT | Tornado Watch | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Tensas | 5 hr |
| May 19, 7:42 PM CDT | Mesoscale Discussion | SPC | Bryan, Marshall | 93 min |
| May 19, 11:40 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Johnston, Latimer and 6 more | 2 hr |
| May 20, 9:40 AM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Bexar, Brazoria, Calhoun, Colorado and 15 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2025Mesoscale Discussions in Arkansas, 2025Mesoscale Discussions in Oklahoma, 2025Every mesoscale discussion in 2025
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.