Thunder.
Against much rain the clouds grow rapidly larger, especially before thunder.
Terraces of Clouds.
When the clouds rise in terraces of white, soon will the country of the corn priests be pierced with the arrows of rain. (Zuñi Indians.)
Variety.
The different kinds of clouds indicate rain.
West Clouds.
When ye see a cloud rise out of the west, straightway ye say there cometh a shower, and so it is. (Luke xii, 54.)
Brassy-colored clouds in the west at sunset indicate wind.
White Clouds.