Hiking canyons can quickly turn deadly when storms hit—what you should know before going in

Hiking a picturesque valley or climbing a craggy gorge are among the most exhilarating experiences in nature. As a geologist, I have hiked and climbed some of the most intense terrain in the world, including in the Andes, Middle Eastern deserts, the Balkans and the Appalachians.

Originally published at Phys.org