Rainfall amounts of around 1 to 2 inches are likely on Monday in the mountains around Stanley and Ketchum, including the Redfish Lake area. Up to 2.5 inches of rainfall is possible, especially for the western Sawtooths. Additional high mountain snowmelt of around 2 inches is expected as well. Quick sudden rises of creeks and small streams is possible, which may make backcountry trails and roads impassable. Isolated mud or rockslides is possible as well. Valley creek in Stanley could reach bankful, if not higher. Anybody with backcountry plans in the mountains around Stanley and Ketchum should monitor this situation closely.
A low pressure storm system and associated atmospheric river of moisture will bring a period of moderate to heavy rainfall to the mountains west of Ketchum, Galena Summit, and Stanley. 1 to 2 inches of rainfall is expected, with locally higher amounts along and west of the spine of the Sawtooths, and lower amounts east of Idaho Highway 75. A couple thunderstorms are also possible, especially Monday afternoon. In addition, temperatures above freezing throughout the event will result in an additional 1 to 3 inches of liquid melting out of the high elevation snowpack. This combination of moderate to heavy rain and melting snow may result in strong rises and localized flooding along smaller creeks and streams, as well as localized rockfalls and landslides. Some backcountry roads and trails may become impassable. The period of greatest potential impacts is expected from 2 AM early Monday morning through 8 PM Monday evening. Anyone with plans in the backcountry and mountains in the Ketchum, Galena Summit, and Stanley corridor should monitor this situation closely and be prepared for hazardous conditions. Consider altering your plans to avoid being in the mountains or backcountry during this period. If you observe flooding, washed out roads, or rockfalls or landslides, please report your observations to the National Weather Service in Pocatello via phone, email, or social media, as soon as it is safe and possible to do so.
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