Assemblage of Clouds.
If an assemblage of small clouds spread out or become thicker and darker, expect rain.
Against the Wind.
If you see a cloud rise against the wind, when that cloud comes up to you the wind will blow the same way that the cloud came, and the same rule holds good of a clear place when all the sky is equally thick except one clear edge. (Shepherd.)
Bull’s Eye.
A small, fast-growing, black cloud in violent motion seen in the tropics, is called the Bull’s Eye, and precedes the most terrible hurricanes.
Black Clouds.
Black clouds in the north in winter indicate approaching snow.
Black Scuds.
Small black scuds (clouds), drifting from southwest, is a sign of rain.