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Rock Dam Reservoir Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Partly Cloudy | Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Lo: 65°FLo: 18°C | Hi: 103°FHi: 39°C | Lo: 71°FLo: 22°C | Hi: 104°FHi: 40°C | Lo: 71°FLo: 22°C | Hi: 105°FHi: 41°C | Lo: 71°FLo: 22°C | Hi: 103°FHi: 39°C | Lo: 71°FLo: 22°C | Hi: 98°FHi: 37°C | Lo: 65°FLo: 18°C | Hi: 98°FHi: 37°C |
| POP: 20% | POP: 10% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1232 AM MDT Tue Aug 18 2026 
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Rock Dam Reservoir Forecast Discussion
Issued: 1138 PM MDT Mon Aug 17 2026
Key Messages
- A frontal boundary promises additional showers mainly over high terrain Tuesday and Wednesday with gusty afternoon winds.
- A warming trend will continue. Triple digits will remain confined to the Four Corners and low desert valleys.
- Monsoonal flow begins to appear in model outputs this weekend.
Discussion
... Issued at 1040 PM MDT Mon Aug 17 2026
High pressure is building into the southwest, with a ridge developing across the Great Basin. Flow aloft has turn...