Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 1108
The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2021, 1:53 AM CDT for 13 counties in Oklahoma; 6 counties in Texas. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Jun 26, 2021, 1:53 AM CDT (06:53 UTC)
- Expired
- Jun 26, 2021, 3:00 AM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 320
Counties Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Custer County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK, Briscoe County, TX, Childress County, TX, Cottle County, TX, Hall County, TX, Hardeman County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 85 km from the middle of the area, began a volume at 06:53 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, 6.9 hours before the alert went out and 212 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
- 957 J/kg
- Mixed-layer CIN
- -173 J/kg
- Mixed-layer LCL
- 1729 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 295 m²/s²
- 0-3 km storm-relative helicity
- 439 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.3
The text
As transmitted.
554
ACUS11 KWNS 260654
SWOMCD
SPC MCD 260653
OKZ000-TXZ000-260800-
Mesoscale Discussion 1108
NWS Storm Prediction Center Norman OK
0153 AM CDT Sat Jun 26 2021
Areas affected...Northwest Texas...Southwest and Central Oklahoma
Concerning...Severe Thunderstorm Watch 320...
Valid 260653Z - 260800Z
The severe weather threat for Severe Thunderstorm Watch 320
continues.
SUMMARY...An isolated wind-damage threat is expected to continue for
another one or two hours. However, the threat should be too marginal
to warrant the issuance of a new watch. If it appears the severe
threat will to linger beyond the 3 am CDT expiration of WW 320, a
local extension could be issued.
DISCUSSION...The latest high-resolution radar from Frederick,
Oklahoma and Amarillo show a broken line of strong thunderstorms
ongoing from 35 statute miles south-southwest of Amarillo arching
into the far southeast Texas Panhandle and western Oklahoma. The
storms are located along and just ahead of a cold front but behind
an outflow boundary. Surface dewpoints are in the mid to upper 60s
F. This is contributing to about 1000 J/kg of MLCAPE according to
the RAP. In addition, the WSR-88D VWP from Amarillo has 0-6 km shear
near 50 kt suggesting that a severe threat could persist for a
couple more hours. Wind damage would be the primary severe hazard.
As instability continues to weaken, the potential for wind damage
should become increasingly marginal. For this reason, new watch
issuance will not be needed beyond the 3 am CDT expiration of WW
320.
..Broyles.. 06/26/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OUN...LUB...AMA...
LAT...LON 35619919 35049975 34650119 34360141 34160127 34060060
33999958 34299844 34889777 35799773 36189798 36129843
35959876 35619919SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 8:49 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Custer, Dewey, Greer, Harmon and 3 more | 86 min |
| Jun 25, 11:36 PM CDT | Mesoscale Discussion | SPC | Ellis, Roger Mills | 84 min |
| Jun 25, 11:42 PM CDT | Mesoscale Discussion | SPC | Craig, Nowata, Osage, Ottawa, Washington | 63 min |
| Jun 25, 11:59 PM CDT | Severe Thunderstorm Watch | SPC | Beckham, Blaine, Caddo, Canadian, Cleveland, Custer and 11 more | 5 hr |
| Jun 26, 12:59 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 12 more | 2 hr |
| Jun 26, 3:27 PM CDT | Mesoscale Discussion | SPC | Harmon | 2 hr |
| Jun 26, 3:48 PM CDT | Severe Thunderstorm Watch | SPC | Caddo, Carter, Comanche, Cotton, Garvin, Grady and 10 more | 9 hr |
| Jun 26, 6:27 PM CDT | Mesoscale Discussion | SPC | Comanche, Cotton, Grady, Jackson, Jefferson, McClain and 2 more | 93 min |
| Jun 26, 4:58 PM CDT | Severe Thunderstorm Watch | SPC | Bailey, Briscoe, Castro, Deaf Smith, Hale, Hall and 6 more | 8 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2021Mesoscale Discussions in Texas, 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.