Washington’s intense bout with record-breaking temperatures likely triggered a glacial mudslide on Mount Rainer. Monitors registered the lahar Tuesday afternoon, saying it lasted for hours. Lahars, ...

Mount Rainier looms over the Pacific Northwest, its snow-capped summit visible from Seattle on clear days. At 14,411 feet, ...

Mount Rainier National Park will hold a virtual public meeting in June so people can learn more about the proposed expansion of a system that monitors and provides alerts of volcanic mudflows. The U.S ...

The snowcapped peak of Mount Rainier, which towers 4.3 kilometers (2.7 miles) above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years. Yet, more ...