Mt. Rainier’s Osceola Mudflow. Season 1 Episode 4 | 4m 50s | Video has closed captioning. 5,600 years ago, a Mt. Rainier eruption sent a wall of mud careening down the White River Valley to Tacoma.

Areas such as Mount Chocorua, Mount Whiteface, Mount Osceola, Mount Tecumseh and Welch Mountain were also affected. Doppler radar indicated thunderstorms producing torrential rain, 60 mph wind ...