Brenna Montagne of Mt. Shasta submitted this photograph of Kelvin-Helmholtz wave clouds, which she spotted above Mount Shasta and captured with her cell phone Feb. 16.

Brenna said she’s a member of the worldwide Cloud Appreciation Society and “is always looking at clouds.” She said she saw what looked like a wave cloud trying to form late that morning, then took this photograph about 4 p.m. after returning from Redding.

Kelvin-Helmholtz clouds, according to information at the website earthsky.org/, “often form on windy days, when there’s a difference in densities of the air, for example, during a temperature inversion. They’re often good indicators of atmospheric instability and the presence of turbulence for aircraft. It’s widely believed that these waves in the sky inspired the swirls in van Gogh’s masterpiece Starry Night.”