Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 759
The Storm Prediction Center issued this mesoscale discussion at May 26, 2021, 11:26 PM CDT for 8 counties in Kansas; 26 counties in Oklahoma; 17 counties in Texas. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2021, 11:26 PM CDT (04:26 UTC)
- Expired
- May 27, 2021, 12:30 AM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 211
All 51 counties
Butler County, KS, Chautauqua County, KS, Cowley County, KS, Elk County, KS, Harper County, KS, Montgomery County, KS, Sedgwick County, KS, Sumner County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Noble County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Armstrong County, TX, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Lamb County, TX, Lubbock County, TX, Motley County, TX, Swisher County, TX, Wheeler County, TX
The radar
The Altus AFB radar (KFDR), 139 km from the middle of the area, began a volume at 04:28 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
Amarillo Airport, TX (KAMA), launched 00:00Z, 4.4 hours before the alert went out and 178 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
- 321 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1447 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
827
ACUS11 KWNS 270426
SWOMCD
SPC MCD 270426
KSZ000-OKZ000-TXZ000-270530-
Mesoscale Discussion 0759
NWS Storm Prediction Center Norman OK
1126 PM CDT Wed May 26 2021
Areas affected...Parts of the Texas Panhandle and western/northern
Oklahoma into southeastern Kansas
Concerning...Tornado Watch 211...
Valid 270426Z - 270530Z
The severe weather threat for Tornado Watch 211 continues.
SUMMARY...A couple of lingering thunderstorms clusters may pose
continuing potential for strong surface gusts into the Midnight-2 AM
CDT time frame, but a general weakening of storms is expected to
proceed and a new severe weather watch does not appear needed.
DISCUSSION...Storms which generally initiated along the dryline have
either dissipated or consolidated into a couple of widely scattered
lingering clusters, ahead of lower/mid-tropospheric troughing
gradually shifting east of the Rockies into the Great Plains. This
activity is currently near the eastern periphery of a southerly 850
mb jet, which has strengthened to 35-40+ kt, but is otherwise
embedded within fairly modest (20-30 kt) southwesterly deep-layer
ambient mean flow. While potential inflow of moist air
characterized by sizable CAPE appears possible another couple of
hours, as activity progresses eastward, the strength of the inflow
may begin to weaken. Latest MRMS CAPPI data suggest that weakening
trends are already underway, and this seems likely to continue.
..Kerr.. 05/27/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...TSA...ICT...OUN...DDC...LUB...AMA...
LAT...LON 33900255 34570216 35370134 36519945 37869740 37779648
37039549 35529768 33820045 33560176 33900255SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 7:32 PM CDT | Mesoscale Discussion | SPC | Clark, Comanche, Kiowa | 88 min |
| May 26, 9:04 PM CDT | Mesoscale Discussion | SPC | Clay, Cloud, Decatur, Jewell, Lincoln, Mitchell and 8 more | 116 min |
| May 27, 12:51 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Atchison, Bourbon, Butler, Chase and 39 more | 84 min |
| May 27, 1:05 AM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Atchison, Bourbon, Brown, Chase and 32 more | 7 hr |
| May 27, 2:17 AM CDT | Mesoscale Discussion | SPC | Atchison, Clay, Cloud, Geary, Jackson, Marshall and 7 more | 58 min |
| May 27, 5:28 AM CDT | Mesoscale Discussion | SPC | Anderson, Douglas, Franklin, Jefferson, Johnson, Leavenworth and 7 more | 92 min |
| May 27, 11:04 AM CDT | Mesoscale Discussion | SPC | Cherokee, Crawford, Labette, Montgomery | 86 min |
| May 27, 1:36 PM CDT | Mesoscale Discussion | SPC | Anderson, Atchison, Butler, Chase, Coffey, Douglas and 18 more | 54 min |
| May 27, 6:03 PM CDT | Mesoscale Discussion | SPC | Douglas, Franklin, Johnson, Leavenworth, Miami, Wyandotte | 87 min |
| May 27, 11:29 AM CDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Beckham, Blaine, Caddo, Canadian and 39 more | 61 min |
| May 27, 11:58 AM CDT | Tornado Watch | SPC | Adair, Alfalfa, Atoka, Beckham, Blaine, Bryan and 66 more | 9 hr |
| May 27, 1:39 PM CDT | Mesoscale Discussion | SPC | Blaine, Garfield, Grant, Kay, Kingfisher, Logan and 6 more | 66 min |
| May 27, 3:25 PM CDT | Mesoscale Discussion | SPC | Blaine, Canadian, Craig, Creek, Custer, Dewey and 13 more | 95 min |
| May 27, 5:34 PM CDT | Mesoscale Discussion | SPC | Caddo, Cleveland, Comanche, Garvin, Grady, McClain and 2 more | 56 min |
| May 27, 6:24 PM CDT | Mesoscale Discussion | SPC | Harmon | 2 hr |
| May 27, 2:50 PM CDT | Mesoscale Discussion | SPC | Borden, Childress, Coke, Collingsworth, Cottle, Crane and 34 more | 115 min |
| May 27, 3:39 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Borden, Brewster, Briscoe, Callahan and 46 more | 7 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2021Mesoscale Discussions in Texas, 2021Mesoscale Discussions in Kansas, 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.