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Number One Reservoir Weather Forecast
| REST OF TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  |  |  | | | | |  | | | |
| Partly Cloudy | Chance of T-Storm | Mostly Clear | Mostly Sunny | Mostly Clear | Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Sunny |
| Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C | Lo: 41°FLo: 5°C | Hi: 81°FHi: 27°C | Lo: 41°FLo: 5°C | Hi: 85°FHi: 29°C | Lo: 45°FLo: 7°C | Hi: 85°FHi: 29°C | Lo: 45°FLo: 7°C | Hi: 85°FHi: 29°C | Lo: 45°FLo: 7°C | Hi: 85°FHi: 29°C |
| POP: 30% | POP: 10% | POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 207 AM MDT Sat Aug 15 2026 
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Number One Reservoir Forecast Discussion
Issued: 1219 AM MDT Sat Aug 15 2026
Key Messages
- A few showers and storms will be possible over the higher terrain though convective coverage and intensity will be less than seen lately.
- Temperatures will gradually increase each day through the weekend and into next week.
Discussion
... Issued at 915 PM MDT Fri Aug 14 2026
A noticeable decline in available moisture began last night and continues today. By this evening, PWATs will reach ...