Mount Rainier hasn't had a major eruption, with strong geologic evidence, in the past 1,000 years, Weiss-Racine said. This story has been updated to fix a typo.

Mount Rainier, despite not erupting in centuries, remains one of the most hazardous volcanoes in North America because of its massive glacial coverage.

With heavy rains forecasted through the weekend, officials at Mount Rainier National Park are warning visitors to be cautious ...