Surf in the sky... - Wave Clouds

By Yoav Naccache Nov 14, 2012

We all love to lay down on the grass, look up to the sky and spot figuers in the clouds. We may see flying horses, dinosaurs and Mickey mouse – but the most of all we love spotting wave clouds. Wave clouds Also known as Kelvin-Helmholtz clouds, are atmospheric waves that are perhaps the last uncrowded line ups left on earth.

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The Kelvin–Helmholtz instability (after Lord Kelvin and Hermann von Helmholtz) can occur when there is velocity shear in a single continuous fluid, or where there is a velocity difference across the interface between two fluids. An example is wind blowing over water: The instability manifests in waves on the water surface. More generally, clouds, the ocean, Saturn's bands, Jupiter's Red Spot, and the sun's corona show this instability.

The theory predicts the onset of instability and transition to turbulent flow in fluids of different densities moving at various speeds. Helmholtz studied the dynamics of two fluids of different densities when a small disturbance, such as a wave, was introduced at the boundary connecting the fluids.

So enjoy the unspoilt natural beauty now, before Laird Hamilton figures out a way to rideagiant wave in the sky

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Yoav Naccache

The Surfer behind "Streamer". Movie quote: "I am just the garbage man" (Big Wednesday)


Jan 01, 1970

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