Watch: 'Firefall' phenomenon gives waterfall lava-like appearance at Yosemite National Park

Watch: 'Firefall' phenomenon gives waterfall lava-like appearance at Yosemite National Park

'Firefall' happens in the winter, when Horsetail Fall is flowing and the sunsent hits the waterfall just right. The phenomenon doesn't last long each year. Just for a few weeks, typically in February.