Glacier detachments: A new hazard in a warming world?

On the evening of 5 August 2013, a startling event occurred deep in the remote interior of the United States’ largest national park. A half-kilometer-long tongue of Alaska’s Flat Creek glacier suddenly broke off, unleashing a torrent of ice and rock that rushed 11 kilometers down a rugged mountain valley into the wilderness encompassed by Wrangell-St. Elias National Park and Preserve.