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Big Rock Rapid Weather Forecast
| REST OF TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  |  |  |  | | | | | |
| Mostly Clear | Mostly Sunny | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 70°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 69°FHi: 21°C |
| POP: 20% | POP: 70% | POP: 70% | POP: 90% | POP: 50% | POP: 50% | POP: 50% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1232 AM MDT Sun Sep 20 2026 
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Issued: 1112 AM MDT Sun Sep 20 2026
Key Messages
Issued at 1109 AM MDT Sun Sep 20 2026- A dangerous surge of monsoon moisture will bring widespread heavy rain Tuesday through Wednesday night with a very good chance for scattered occurrences of flash flooding, as well as some main stem river and tributary flooding.
- The monsoon surge should continue at a less intense pace Thursday and Friday, when locally heavy rainfall will continue to be a threat as precipitation amounts generally trend downward with each day.
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... (18Z TAFS) ...