Hydrologic Outlook
None

ESFSEW Another moderately strong atmospheric river will impact western Washington starting as early as Saturday night and extending into Wednesday. Rain, heavy at times, is likely. The snow level will be 5000 feet rising to 8000 ft during the heaviest rainfall on Monday before dropping to 3000 to 4000 feet Monday night into Tuesday. In addition, soils will still be nearly saturated and rivers elevated or still above flood stage. Expect rising rivers with the potential for flooding. Urban flooding, landslides, and debris flows are also possible throughout this period. Please monitor the latest river forecasts from the National Weather Service for additional information.

North Twin Sister Mountain Peaks

Mountain Peaks

Pacific Ranges

Cascade Range

Last Updated: December 13, 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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Hydrologic Outlook
Until 2025-12-13T06:30:00-08:00 • National Weather Service
ESFSEW Another moderately strong atmospheric river will impact western Washington starting as early as Saturday night and extending into Wednesday. Rain, heavy at times, is likely. The snow level will be 5000 feet rising to 8000 ft during the heaviest rainfall on Monday before dropping to 3000 to 4000 feet Monday night into Tuesday. In addition, soils will still be nearly saturated and rivers elevated or still above flood stage. Expect rising rivers with the potential for flooding. Urban flooding, landslides, and debris flows are also possible throughout this period. Please monitor the latest river forecasts from the National Weather Service for additional information.