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![Plate 29-32 of 1921 cloud chart wea02332.jpg Plate 29-32 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_wea02332.jpg?itok=Eh1keh3d)
Description
Plate 29-32 of 1921 cloud chart. 29. Anvil top of cumulo-nimbus (upper).Mammato alto-stratus on underside of cumulo-nimbus overflow in vicinity oftornado (lower). 30. Nimbus, with fog or stratus below. 31. Fracto-stratus (right) under alto-stratus and cirro-straus, apparently from local thunderstorms. 32. Stratus clouds at two levels; one practically on the ground. (Image credit: NOAA Central Library Historical Collections)