Yosemite’s Horsetail Falls become a spectacular reddish color as the setting sun light hits the water and ice to create the illusion that the falls are on fire, in Yosemite National Park on Friday, Feb. 22, 2019. This photo was taken with the SIGMA 60-600mm F4.5-6.3 DG OS HSM Sports lens set at 413mm. This effect only happens around mid February if conditions are right. There has to be enough snow at the top of El Capitan, it has to be just warm enough for some of the snow to begin melting, the sun has to set at just the right angle and there has to be clear western sky so that sunlight illuminates the falls.