A warmer world means a greater risk rain lands on snow, triggering floods

In June 2013, Keith Musselman was living in the Canadian Rockies when the nearby Bow River flooded. “We were in a valley, so we were stuck for about five days,” Musselman told Ars. “The community was devastated.” The flood was one of the costliest and most devastating natural disasters in Canada’s history, with five people killed, more than 100,000 evacuated, and extreme property damage. Heavy rainfall falling on late snow in the mountains had overwhelmed rivers and reservoirs, and Musselman, a hydrologist, realized that this kind of rain-on-snow flooding wasn’t properly understood.

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