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![Plate 25-28 of 1921 cloud chart wea02331.jpg Plate 25-28 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_wea02331.jpg?itok=wTxS_fqb)
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Plate 25-28 of 1921 cloud chart. 25. Cumulus. 26. Cumulus rolls. (Suchclouds when they mark the front of an arriving wedge of cool air may developthunderstorms locally.) 27. Cumulo-nimbus, just grown from cumulus.... 28.Low cumulo nimbus, and cumulus, characteristic of spring. (Image credit: NOAA Central Library Historical Collections)