Spilling Thought: #Rainbows are a fan favorite in #Yosemite, commonly seen alongr the park's flowing waterfalls on sunny days. Halos and coronas around the sun or moon are also a typical sight. Recently, a lucky visitor was able to spot and capture this rare occurrence --cloud iridescence -- over #GlacierPoint. This optical phenomenon is caused when sunlight diffracts off tiny ice crystals or water droplets and creates a rainbow effect. Iridescent clouds typically occur in late afternoons in hot and humid weather, so be sure keep your eye out! Photo from @yosemitenps. 🌈 by usinterior