Cloud streets downwind of the Aleutian Islands. What looks a little like a shore break is actually a NASA image of cloud formations over Alaska's Aleutian Islands. Turbulence caused by the wind passing over the highest points of the islands produces the pronounced eddies that swirl the clouds into a pattern called a vortex "street." In this example, the clouds have also aligned in parallel rows or streets.
Photo: Nasa / AP
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