Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 1906
The Storm Prediction Center issued this mesoscale discussion at Oct 26, 2021, 9:37 PM CDT for 11 counties in Oklahoma; 32 counties in Texas. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Oct 26, 2021, 9:37 PM CDT (02:37 UTC)
- Expired
- Oct 26, 2021, 11:00 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 537
All 43 counties
Beckham County, OK, Caddo County, OK, Comanche County, OK, Cotton County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Eastland County, TX, Fisher County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Irion County, TX, Jones County, TX, King County, TX, Knox County, TX, McCulloch County, TX, Menard County, TX, Nolan County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Sutton County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX
The radar
The Dyess AFB radar (KDYX), 68 km from the middle of the area, began a volume at 02:39 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
Midland Regional, TX (KMAF), launched 00:00Z, 2.6 hours before the alert went out and 217 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 4696 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
358 ACUS11 KWNS 270238 SWOMCD SPC MCD 270237 OKZ000-TXZ000-270400- Mesoscale Discussion 1906 NWS Storm Prediction Center Norman OK 0937 PM CDT Tue Oct 26 2021 Areas affected...Southern Plains Concerning...Severe Thunderstorm Watch 537... Valid 270237Z - 270400Z The severe weather threat for Severe Thunderstorm Watch 537 continues. SUMMARY...Severe threat should increase across the western half of ww537 over the next few hours. DISCUSSION...Dryline/Pacific front will soon be nudged east as large-scale forcing continues to overspread the southern Plains. Convection is growing upscale across northwestern TX as an arcing squall line is maturing from Hardeman to Kent County along the boundary. Over the next several hours this evolving linear MCS should progress northeast across the northern half of ww537. Farther south, latest IR satellite and radar imagery suggest a forced line of thunderstorms is emerging along the wind shift from Upton-Scurry County TX. This activity should steadily advance east, likely overspreading much of the southwestern portions of the watch by midnight. ..Darrow.. 10/27/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FWD...OUN...SJT...LUB...MAF... LAT...LON 30490152 35319969 35329758 30529952 30490152
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 26, 7:23 PM CDT | Severe Thunderstorm Watch | SPC | Caddo, Comanche, Cotton, Grady, Greer, Harmon and 5 more | 8 hr |
| Oct 26, 8:59 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Custer, Dewey, Ellis, Harper and 4 more | 91 min |
| Oct 26, 10:09 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Cleveland, Coal, Creek and 31 more | 66 min |
| Oct 26, 10:26 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 26 more | 7 hr |
| Oct 27, 1:13 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Coal, Creek, Hughes, Johnston and 15 more | 2 hr |
| Oct 27, 1:32 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bastrop, Bell, Bexar, Blanco, Bosque and 48 more | 6 hr |
| Oct 27, 1:59 AM CDT | Mesoscale Discussion | SPC | Collin, Cooke, Dallas, Denton, Ellis, Grayson and 8 more | 91 min |
| Oct 27, 5:13 AM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bastrop, Bexar, Brazos, Burleson and 22 more | 2 hr |
| Oct 27, 7:36 AM CDT | Mesoscale Discussion | SPC | Chambers, Hardin, Jasper, Jefferson, Newton, Orange and 1 more | 84 min |
| Oct 27, 7:55 AM CDT | Tornado Watch | SPC | Angelina, Brazoria, Chambers, Fort Bend, Galveston, Hardin and 16 more | 9 hr |
| Oct 27, 9:08 AM CDT | Mesoscale Discussion | SPC | Hardin, Jasper, Jefferson, Newton, Orange, Tyler | 97 min |
| Oct 27, 9:44 AM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Harrison, Marion, Panola, Shelby | 2 hr |
| Oct 27, 10:08 AM CDT | Tornado Watch | SPC | Harrison, Marion, Panola, Shelby | 5 hr |
| Oct 27, 10:59 AM CDT | Mesoscale Discussion | SPC | Newton | 91 min |
| Oct 27, 12:52 PM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Harrison, Marion, Panola, Shelby | 83 min |
Nearby
Mesoscale Discussions in Texas, 2021Mesoscale Discussions in Oklahoma, 2021Every mesoscale discussion in 2021
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.