It was a quiet Sunday morning, at 8:32 a.m., 38 years ago when Mount St. Helens blew its top, sending tons of ash into the sky. The volcano had been quiet since the 1850s, but in 1980, geologists were ...

The warning did not arrive as a single dramatic sign but as a slow distortion of a familiar peak. As the north side of Mount St. Helens swelled outward in the spring of 1980, scientists watched a ...