This winter’s snow drought may leave a mark that lasts for centuries. Justin DeRose, a dendrochronologist and assistant professor of silviculture and applied forest ecology at Utah State University, says trees across the West are already recording the story of climate in their rings — wet years, dry years, fire years, and sometimes years so harsh they leave almost no growth at all. And as drought years begin stacking up closer and closer together, those forests may be telling us something important about how fast the West is changing.