An "asperatus" cloud rolls over New Zealand's South Island.
This apparently new class of clouds is still a mystery. But experts suspect asperatus clouds' choppy undersides may be due to strong winds disturbing previously stable layers of warm and cold air.
Asperatus clouds may spur the first new classification in the World Meteorological Organization's International Cloud Atlas since the 1950s.
National Geographic has the full article and more amazing images.
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