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"This was special and I immediately knew I needed to capture it," said local Rachel Gordon.
The billowy phenomenon was visible on Tuesday above the crest of the Bighorn Mountains from the city of Sheridan.
Known as Kelvin-Helmholtz instability, they form when a faster stream of air moves above rising air below.
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These wave-like clouds are called Kelvin-Helmholtz clouds, a nod to Lord William Kelvin and Hermann von Helmholtz, the meteorologists whose interest in turbulent airflow led them to study the physics behind this type of formation.
Also referred to as shear-gravity clouds or billow clouds, these formations most commonly occur on windy days when there is a difference in the speed, direction, or density between two wind currents at different levels in the atmosphere. When wind moves faster at the top of the cloud formation than at the bottom, the faster-moving air can whip up curls of the cloud formation from the slower-moving level of air below, causing the wave-like clouds.