A memorable year for Yosemite waterfalls.
During the past six years of drought, Yosemite National Park's waterfalls ran at their fullest--which wasn't much--in April. But this year, thanks to the heavy snowpack in the Sierra, things are back to normal, which means that cascades such as Vernal Falls will be at their peak from mid-May through early June. What do we mean by "peak"? In early fall, when the snowpack is at its most depleted, as little as 25 cubic feet of water per second flows down the Merced River. At the height of waterfall season, the volume can be 250 times as great.