Rare Kelvin–Helmholtz clouds captured over Cyprus

On Tuesday afternoon, wave-like Kelvin–Helmholtz clouds were observed over Cyprus. The photos were taken by Chris Belesis and published on the “Weather Enthusiasts of Cyprus” page.

These structures resemble ocean waves and form when two layers of air move at different speeds. When the upper layer moves faster than the lower one, instability occurs at the boundary, known as Kelvin–Helmholtz instability.

The distinctive wave pattern becomes visible when thin clouds are present, most often altocumulus or cirrus clouds. The phenomenon occurs in the upper layers of the atmosphere, where wind shear is strongest.

The structure usually lasts for several minutes before the air currents mix and the wave shape dissipates. Media note that this is a natural meteorological phenomenon mathematically described in the 19th century by Lord Kelvin (William Thomson) and Hermann von Helmholtz.

For residents of Cyprus, this is a visually striking but short-lived natural event that poses no danger.