A large thunderstorm advancing over the Tucson Mountains toward the Desert Museum. Its size and power are revealed by the low line of approaching clouds and the darkness behind them. In smaller storms you can see the entire cumulus cloud from cauliflower top to rain spout

Retrieved from the Arizona-Sonora Desert Museum web site on 11-07-2024
http://asdm.museum/desert/habitats_AZUstorm04.php