Rippling Altocumulus Undulatus Clouds

I’m a big sky and cloud watcher and am always on the lookout for interesting cloud formations. Here is a photo of some clouds that I spotted yesterday that appears to be altocumulus undulatus. The ripples and waves in the clouds occurred at two levels of altitude moving in opposite direction. The higher cloud level moved east to west, and the lower level moved north to south.  (Click on the image for a larger view.)  

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