Mount St. Helens Erupts Mount St. Helens erupted today around 5:30 pm PST. For more information visit: Mount St. Helens VolcanoCam The Pacific Northwest Seismograph Network USGS Cascades Volcano Observatory By Brent Logan Engineer. Lawyer. WordPress geek. Longboarder. Blood donor. Photographer. More about Brent. View all of Brent Logan's posts.