Tule (too-lee) fog is a weather phenomenon unique to the San Joaquin Valley. Named after the Tule River, the fog is produced when moist air fills the valley bed and is trapped against the cold damp ground by an inversion layer of warmer air above. Essentially the vapor droplets in the fog freeze forming an impenetrable cloud of suspended ice. Seeing the fog make its winter-y creep into the Valley got me to musing about patience.