Last night's full moon provided a very brief and rare occurrence at Lower Yosemite Falls - a moonbow! - and with the Big Dipper in the sky right above. Moonbows only occur when the moon is bright enough, it's in the proper position, there are no clouds, and the waterfall in question has enough water flowing and is generating enough mist. Road trip day 22. I’m on a 40+ day, 5,000+ mile #roadtrip of the western United States.