Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 1249
The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2021, 8:01 PM CDT for Crawford County, Sebastian County, Arkansas; 14 counties in Oklahoma. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2021, 8:01 PM CDT (01:01 UTC)
- Expired
- Jul 10, 2021, 9:30 PM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 367
Counties Crawford County, AR, Sebastian County, AR, Adair County, OK, Cherokee County, OK, Creek County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK
The radar
The Tulsa radar (KINX), 61 km from the middle of the area, began a volume at 01:02 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, 1.0 hours before the alert went out and 171 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.
901
ACUS11 KWNS 110102
SWOMCD
SPC MCD 110101
ARZ000-OKZ000-110230-
Mesoscale Discussion 1249
NWS Storm Prediction Center Norman OK
0801 PM CDT Sat Jul 10 2021
Areas affected...Eastern/East-Central OK...Northwest/West-Central AR
Concerning...Severe Thunderstorm Watch 367...
Valid 110101Z - 110230Z
The severe weather threat for Severe Thunderstorm Watch 367
continues.
SUMMARY...Isolated wind damaging gusts remain possible across
northeastern OK. A downstream watch across east-central
OK/west-central AR is not currently anticipated.
DISCUSSION...Recent KINX radar imagery shows the cold pool out ahead
of main convective cluster. Updrafts within this cluster are also
weaker than those developing farther west along the cold front. The
downstream air mass is strongly unstable and storm development
behind the cold pool will likely continue. However, given the
current storm trends and expectation for vertical shear to remain
near its current strength (or perhaps even weaken a little), it
seems unlikely that reinvigoration of this line/cluster will occur
and storms will likely stay sub-severe. As such, a downstream watch
is not currently anticipated.
..Mosier.. 07/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...TSA...OUN...
LAT...LON 36079652 36429594 35959412 35019428 34839535 35059634
36079652SPC 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, 9:21 PM CDT | Mesoscale Discussion | SPC | Atoka, Carter, Cleveland, Coal, Comanche, Cotton and 18 more | 84 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 |
Nearby
Mesoscale Discussions in Oklahoma, 2021Mesoscale Discussions in Arkansas, 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.