408 FXUS64 KOUN 210342 AFDOUNArea Forecast Discussion National Weather Service Norman OK 1042 PM CDT Sat Sep 20 2025
...New AVIATION...
.KEY MESSAGES... Updated at 1029 PM CDT Sat Sep 20 2025
- Scattered showers and storms are likely through the overnight hours. A few strong to severe storms possible.
- Severe storms are again possible on Sunday and Monday.
- Above-normal temperatures through the weekend before potentially cooling down to near-normal by the middle of next week.
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.NEAR TERM... (Rest of today and tonight) Issued at 1231 PM CDT Sat Sep 20 2025
A shortwave mid-level trough will swing across the southern Plains this afternoon and evening. Scattered thunderstorms are expected to develop starting this afternoon across the western third of the area. Storms will be developing in an environment characterized by DCAPE of around 1200 J/kg, in addition to sufficient instability. Stronger storms are expected to develop within this environment and will be capable of producing strong to damaging wind gusts and large hail. Storms generally will move to the east through the evening.
Additional development is possible overnight across much of the area as a low-level jet increases after sunset. Marginally severe storms are again possible overnight across much of the area. Flooding concerns may develop should storms train over the same area this afternoon through the overnight hours.
Bunker
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.SHORT TERM... (Sunday through Monday night) Issued at 1231 PM CDT Sat Sep 20 2025
Showers and storms will likely be ongoing Sunday morning across portions of the area. The aforementioned trough will shift to the east and northwest flow will move in from the west. This flow will help to continue showers and storms into the afternoon, decreasing from west to east during the evening.
Hot temperatures are expected Monday as an upper ridge builds over the southern Plains. Many locations will get into the low 90s, while locations to the southwest will approach 100 F. Increasing southerly surface flow will transport upper 60s to low 70s dewpoints northward across much of the area. This moisture will support a very unstable atmosphere by the afternoon. Lack of large scale ascent during the day is likely to preclude storms from developing at least in the afternoon. A mid-level wave begins to move towards the southern Rockies later in the evening, which will foster storm initiation across the lee of the Rockies in southwestern Kansas. This development will congeal into a line and shift towards our area. As this line moves into and across the area, damaging winds will be the primary hazard.
Bunker
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.LONG TERM... (Tuesday through Friday) Issued at 1254 AM CDT Sat Sep 20 2025
Ensemble guidance continues to point towards a positively tilted trough axis by the middle of next week. Thus, increased rain and storm chances will continue through Tuesday and Wednesday, followed by much cooler (near or slightly below-average) temperatures in the 70s to 80s by Wednesday and through the remainder of the week. The largest uncertainty remains to be the strength, timing and position of this trough axis which will play a significant role in how long daily rain and storm chances continue through next week and how long the cooler airmass will be in place.
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.AVIATION... (06Z TAFS) Issued at 1029 PM CDT Sat Sep 20 2025
Scattered showers and thunderstorms continue to develop late this evening, especially across western & southern Oklahoma and western north Texas. With a modest low-level jet and weak shortwave trough approaching, additional development should continue which will mainly impact terminal sites at CSM/LAW/SPS. Although elevated instability is weak, increasing effective shear may result in a few stronger storms. It`s possible storms will linger through Sunday morning before moving south and east of the area. Additional storms are possible Sunday afternoon, especially across southern Oklahoma and western north Texas. Overall, VFR conditions are expected, but some of the stronger storms will lower visibility to below 3 miles.
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.PRELIMINARY POINT TEMPS/POPS... Oklahoma City OK 68 82 67 90 / 50 60 40 20 Hobart OK 66 89 66 95 / 60 50 20 10 Wichita Falls TX 69 91 70 97 / 50 50 20 10 Gage OK 62 85 62 89 / 50 30 10 10 Ponca City OK 66 82 65 88 / 60 50 50 20 Durant OK 70 90 71 92 / 10 20 30 30
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.OUN WATCHES/WARNINGS/ADVISORIES... OK...None. TX...None. &&
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NEAR TERM...13 SHORT TERM...13 LONG TERM....23 AVIATION...06
NWS OUN Office Area Forecast Discussion