Alert archive / Oklahoma / Mesoscale Discussions in 2021
Mesoscale Discussion 1247
The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2021, 7:21 PM CDT for 17 counties in Oklahoma. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2021, 7:21 PM CDT (00:21 UTC)
- Expired
- Jul 10, 2021, 8:45 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 367...368
Counties Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Creek County, OK, Custer County, OK, Greer County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Washita County, OK
The radar
The Norman radar (KTLX), 102 km from the middle of the area, began a volume at 00:23 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
Norman, OK (KOUN), launched 00:00Z, 0.4 hours before the alert went out and 97 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.
364
ACUS11 KWNS 110021
SWOMCD
SPC MCD 110021
OKZ000-110145-
Mesoscale Discussion 1247
NWS Storm Prediction Center Norman OK
0721 PM CDT Sat Jul 10 2021
Areas affected...Central/Western OK
Concerning...Severe Thunderstorm Watch 367...368...
Valid 110021Z - 110145Z
The severe weather threat for Severe Thunderstorm Watch 367, 368
continues.
SUMMARY...Severe threat will continue across central and western OK
through the evening as thunderstorms develop along the cold front.
DISCUSSION...Recent surface analysis placed the cold front from
about 50 miles northwest of CSM to about 15 miles northwest of BVO.
Much of the activity in northeast/north-central OK has occurred
ahead of the cold front thus far, but the most recent storm
development south of END and near JWG is occurring along the wind
shift associated with the cold front. Remnant outflow boundary also
exists from just southwest of CSM to just south of JWG.
The air mass south of the front across central and western OK is
strongly unstable and moderately sheared and severe thunderstorms
are still expected to develop southwestward along the front over the
next few hours. Some hail is possible with initial updrafts, but
quick linear development is anticipated as the outflow surges
southward, resulting in strong wind gusts as the primary threat. Low
probability tornado potential will still exist for the next few
hours, but weak low-level vertical shear show limit the overall
threat.
..Mosier.. 07/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...TSA...OUN...
LAT...LON 35639957 36259783 36759625 35499628 34869893 34879991
35639957SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 8:01 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Creek, Haskell, Hughes, Latimer and 8 more | 89 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, 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.