Altocumulus undulatus. This formation occurred during a transition from altostratus to altocumulus. Looking NW from Cheyenne at 9:11 A. M.
Image ID: wea03011, NOAA's National Weather Service (NWS) Collection Location: Cheyenne, Wyoming Photo Date: 1933 January 5 Photographer: H. Floreen • High Resolution Photo Available
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