Five of the volcanoes it tracks are in Washington state. In the latest update to the National Volcano Threat Assessment released in 2018, Mount St. Helens holds the position as the second biggest ...

Washington state's top polluter isn't a pulp mill, a power plant or refinery. It's the newly awakened Mount St. Helens. Since the volcano began erupting in early October, it has been pumping ...

After more than two months of rumbling, Washington state's Mount St. Helens erupted with a force equivalent to as much as 50 megatons of TNT. The massive blast and subsequent landslides ...