The U.S. Army Corps of Engineers is set to start raising a dam used to catch millions of tons of Mount St. Helens sediment that flows each year from the mountain into the Toutle, Cowlitz and Columbia ...

The simultaneous eruption of multiple volcanoes suggests a vast, interconnected network of magma exists beneath the surface, powered by the intense gravitational pull of Jupiter.

As part of Juno’s extended mission, the spacecraft is making close encounters of Jupiter’s large Galilean moons after having ...

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 ...

Leaders around Cowlitz County said Friday that sediment from Mount St. Helens worsened flooding along the Cowlitz River and called on the U.S. Army Corps of Engineers to start dredging it — a request ...

A hazy cloud that emerged over the active volcano was the result of high winds rather than a new eruption. By Amy Graff and Soumya Karlamangla On the morning of May 18, 1980, the most destructive ...

That came after scientists received reports of a large plume rising above the volcano, which turned out to be volcanic ash from the 1980 Mount St. Helens eruption. “It kind of looks like a brownish ...

Some Pacific Northwesterners woke Tuesday to an unusual sight: A smoky haze shrouded Mount St. Helens, the large, active stratovolcano in Washington state that erupted catastrophically in 1980. But a ...

Mount St. Helens looked like it might be erupting again. Commercial pilots flying in the area Tuesday reported clouds of fine volcanic ash rising into the air above the collapsed dome of the Cascades’ ...

(CNN) — For a moment, it seemed like a blast from the past: a plume over Mount St. Helens on Tuesday looked like the volcano might be erupting again. But fortunately, this was not an eruption — just a ...