Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 1104
The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2021, 8:49 PM CDT for 9 counties in Oklahoma; Childress County, Collingsworth County, Hall County, Texas. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Jun 25, 2021, 8:49 PM CDT (01:49 UTC)
- Expired
- Jun 25, 2021, 10:15 PM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 315...318
Counties Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Greer County, OK, Harmon County, OK, Kingfisher County, OK, Major County, OK, Washita County, OK, Childress County, TX, Collingsworth County, TX, Hall County, TX
The radar
The Altus AFB radar (KFDR), 111 km from the middle of the area, began a volume at 01:53 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 00:00Z, 1.8 hours before the alert went out and 190 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.
018
ACUS11 KWNS 260149
SWOMCD
SPC MCD 260149
OKZ000-TXZ000-260315-
Mesoscale Discussion 1104
NWS Storm Prediction Center Norman OK
0849 PM CDT Fri Jun 25 2021
Areas affected...Southeastern TX Panhandle...western OK
Concerning...Severe Thunderstorm Watch 315...318...
Valid 260149Z - 260315Z
The severe weather threat for Severe Thunderstorm Watch 315, 318
continues.
SUMMARY...Hail and wind remain possible across western Oklahoma into
the eastern Texas Panhandle.
DISCUSSION...Cloud tops have gradually cooled across south-central
KS, south into the eastern TX Panhandle. Radar data suggests an MCV
may be forming near DDC, and this appears to be aiding the southward
frontal surge across the northern TX Panhandle. Convection has
struggled to advance appreciably east into OK, but the evolving MCV
and frontal surge are likely indicators this activity is going to
move across central into eastern portions of ww318 over the next
several hours. More isolated activity extends southwest to near PVW
where large hail has been noted at times.
..Darrow.. 06/26/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OUN...LUB...AMA...
LAT...LON 34809959 34140075 34650132 35599974 36529850 36029778
34809959SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 1:53 AM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Comanche, Custer, Grady and 7 more | 67 min |
| 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.