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![Plate 17-20 of 1921 cloud chart wea02329.jpg Plate 17-20 of 1921 cloud chart](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_wea02329.jpg?itok=dvynyMr_)
Description
Plate 17-20 of 1921 cloud chart. 17. Strato-cumulus or alto-cumulus from analtitude of about 1,750 meters.... 18. Ragged strato-cumulus rolls belowfibrous alto-stratus.... 19. Strato-cumulus rolls, with strong east wind atsurface. 20. Ragged strato-cumulus rolls at 800 meters altitude in NW wind inwinter. Inset: same clouds viewed from height of 1,100 meters. (Image credit: NOAA Central Library Historical Collections)