Plate 29-32 of 1921 cloud chart

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 of tornado (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.

Photo Category: Weather Wonders
Photo Date: 1921