Mammatus Clouds Over Olympic Valley
Normal cloud bottoms are flat because warm moist air that rises and cools condenses into water droplets at specific temperatures. This corresponds to a very specific height. An opaque cloud forms after the water droplets form. Cloud pockets can develop that contain large droplets or ice that fall into clear air as they evaporate. Such pockets may occur in turbulent air - like near the top of an anvil cloud for example. These mammatus clouds were photographed over Olympic Valley, CA.
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