What are the cool 'wave like' clouds we sometimes see?

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by Jeff Renner

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KING5.com

Posted on October 23, 2012 at 5:46 PM

What are the cool 'wave like' clouds we sometimes see?

The clouds seem to ripple up and down in rows...almost as though we were underwater looking up at the surface. They're generally found when warmer air is moving in, a warm front, with moist, warm air gliding over cooler, drier air near the surface. These clouds are typically near 10,000' or so above the ground, called alto-stratus clouds. Because of their up-down motion, they're called 'undulatus' or 'asperatus' clouds...from the latin words for 'undulating'...or...'rough'.

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