Special Weather Statement
None

Significant rainfall over the past week has increased soil moisture to high levels across western Washington. This significant rain has put extra pressure on soil instability, leading to an increased threat of landslides and debris flows, especially from recent burned areas. Precipitation will remain fairly light through most of the weekend but a frontal system will move through Sunday night into Monday, bringing a quick hit of heavier rainfall which could act as a trigger. Numerous landslides have already occurred across the area. More landslides continue to be possible. Areas most susceptible to landslides debris flows under these conditions are steep coastal bluffs, other steep hillsides or road cuts, and recent burned areas. A diminishing threat of landslides and debris flows will continue for several days after the rain ends. For more information about current conditions, visit www.weather.gov/seattle, select Hydrology, and then scroll down for the links to the landslide information pages. For more information on landslides, visit the website for the Washington State Department of Natural Resources landslide geologic hazards at: http://bit.ly/2mtA3wn

North Twin Sister Mountain Peaks

Mountain Peaks

Pacific Ranges

Cascade Range

Last Updated: December 21, 2025

North Twin Sister is a prominent peak located in the Pacific Ranges mountain range in Washington, USA.

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Summary

With an impressive elevation of 6,140 feet, it offers breathtaking views and challenging mountaineering opportunities. This mountain is known for its rugged terrain and stunning alpine scenery.

During the winter season, North Twin Sister accumulates a substantial snowpack, making it a popular destination for backcountry skiing and snowshoeing enthusiasts. The snowpack range varies depending on the specific year and weather conditions, typically ranging from several feet to over ten feet deep. This makes it an excellent location for winter sports and activities.

Several creeks and rivers receive runoff from North Twin Sister, providing a vital water source for surrounding ecosystems. While specific creeks and rivers are not mentioned in the available sources, it can be inferred that the mountain contributes to the overall hydrology of the region.

Regarding its name origin and folklore, there is limited information available from the provided sources. Further research is recommended to uncover any potential historical or cultural significance associated with North Twin Sister.

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Special Weather Statement
Until 2025-12-21T16:00:00-08:00 • National Weather Service
Significant rainfall over the past week has increased soil moisture to high levels across western Washington. This significant rain has put extra pressure on soil instability, leading to an increased threat of landslides and debris flows, especially from recent burned areas. Precipitation will remain fairly light through most of the weekend but a frontal system will move through Sunday night into Monday, bringing a quick hit of heavier rainfall which could act as a trigger. Numerous landslides have already occurred across the area. More landslides continue to be possible. Areas most susceptible to landslides debris flows under these conditions are steep coastal bluffs, other steep hillsides or road cuts, and recent burned areas. A diminishing threat of landslides and debris flows will continue for several days after the rain ends. For more information about current conditions, visit www.weather.gov/seattle, select Hydrology, and then scroll down for the links to the landslide information pages. For more information on landslides, visit the website for the Washington State Department of Natural Resources landslide geologic hazards at: http://bit.ly/2mtA3wn