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![Plate 1-4 of 1921 cloud chart wea02325.jpg Plate 1-4 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_wea02325.jpg?itok=mIFkicmW)
Description
Plate 1-4 of 1921 cloud chart. 1. Cirrus becoming detached from thunderstormtop. 2. Dense, bunched cirrus, probably of thunderstorm origin. 3. Tuftedcirrus, similar to (2) but thinner. 4. Cirro-stratus and fibrous alto-stratussuch as originate from thunderstorm tops. (Image credit: NOAA Central Library Historical Collections)