Figure 16.2: The four cloud types and where they are found in the atmosphere. The symbols
are shown inTable16.2: ( 45 )
ice crystals that form create thin, wispycirrus clouds (Figure16.3). Cirrus clouds may
indicate an oncoming storm.
Figure 16.3: Cirrus clouds are thin wisps of ice crystals found at high altitudes. ( 36 )Cirrocumulusclouds are small, white puffs that ripple across the sky, often in rows.Cir-
rostratusclouds are thin, white sheets of clouds, made up of ice crystals like cirrus clouds
(Figure16.4). Cirrostratus clouds are sometimes so thin that they cannot be seen, unless