An eye-catching cloud formation drifts over a mountain range May 31 in Taitung County, southeastern Taiwan. Commonly known as a spiral cloud, the natural weather phenomenon occurs when hot surface air rises to meet the colder air above. (CNA)
An eye-catching cloud formation drifts over a mountain range May 31 in Taitung County, southeastern Taiwan. Commonly known as a spiral cloud, the natural weather phenomenon occurs when hot surface air rises to meet the colder air above. (CNA)