Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 1251
The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2021, 9:21 PM CDT for 24 counties in Oklahoma; Clay County, Wichita County, Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2021, 9:21 PM CDT (02:21 UTC)
- Expired
- Jul 10, 2021, 10:45 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 367...368
All 26 counties
Atoka County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Clay County, TX, Wichita County, TX
The radar
The Norman radar (KTLX), 85 km from the middle of the area, began a volume at 02:24 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
Norman, OK (KOUN), launched 00:00Z, 2.4 hours before the alert went out and 72 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
- 2495 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 1225 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 185 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 14.8
The text
As transmitted.
540
ACUS11 KWNS 110222
SWOMCD
SPC MCD 110221
OKZ000-TXZ000-110345-
Mesoscale Discussion 1251
NWS Storm Prediction Center Norman OK
0921 PM CDT Sat Jul 10 2021
Areas affected...Central/South-Central/Southeast OK...Far Northwest
TX.
Concerning...Severe Thunderstorm Watch 367...368...
Valid 110221Z - 110345Z
The severe weather threat for Severe Thunderstorm Watch 367, 368
continues.
SUMMARY...Ongoing storms across central and east-central OK will
likely maintain severe intensity for the next few hours into
south-central and southeast OK.
DISCUSSION...Recent storm motion for the ongoing convective line
moving through central OK is south-southeast at 28 kt. At its
current speed, the line will move to the edge of Severe Thunderstorm
Watch 368 in Pottawatomie County around 330Z. However, it is likely
the line will begin to increase its southward progression.
Additionally, the storms are already near the edge of the watch in
Lincoln County.
Very strong updrafts exist within this line and the cold pool
remains close to the leading edge of the strong reflectivity. These
observations, in tandem with the strong instability still in place
within the downstream air mass, suggest the storms will likely
remain strong to severe as they move into more of south-central OK
and eventually into portions of far northwest TX.
The storms ongoing across east-central OK have also experienced some
renewed vigor as the cold front moves through and the severe threat
may persist past the edge of Severe Thunderstorm Watch 367 into more
of southeast OK as well.
..Mosier/Thompson.. 07/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...TSA...FWD...OUN...
LAT...LON 34419945 35099868 35509591 35169519 34389514 33989650
33649859 34419945SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 7:21 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Creek, Custer and 11 more | 84 min |
| Jul 10, 8:01 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Creek, Haskell, Hughes, Latimer and 8 more | 89 min |
| Jul 10, 9:35 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Coal, Comanche, Cotton and 15 more | 5 hr |
| Jul 10, 11:56 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Comanche and 12 more | 94 min |
| Jul 11, 2:46 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Collin, Denton, Foard and 6 more | 29 min |
| Jul 11, 11:48 AM CDT | Mesoscale Discussion | SPC | Culberson, Loving, Reeves, Ward, Winkler, Yoakum | 87 min |
| Jul 11, 12:16 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Borden, Cochran, Dawson, Ector, Gaines and 14 more | 7 hr |
| Jul 11, 2:33 PM CDT | Mesoscale Discussion | SPC | Andrews, Cochran, Dawson, Ector, Gaines, Hockley and 5 more | 87 min |
| Jul 11, 3:23 PM CDT | Severe Thunderstorm Watch | SPC | El Paso, Hudspeth | 8 hr |
| Jul 11, 6:51 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Cherokee, Coke, Concho, Coryell and 22 more | 84 min |
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.