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![Plate 9-13 of 1921 cloud chart wea02327.jpg Plate 9-13 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_wea02327.jpg?itok=0jCPP6Uh)
Description
Plate 9-13 of 1921 cloud chart. 9. Cirro-cumulus, overhead. 10. Cirro-cumulus, with tufted cirrus. 11. Thin, undulated alto-straus forming above alayer of fog or stratus... 12. Thin alto-stratus (lower right) transforming togrowing alto-cumulus, which becomes merged into dense alto-stratus.... (Image credit: NOAA Central Library Historical Collections)