Storm clouds gathering equate to similarly stormy times, especially on an emotional level.
Dark clouds reveal depression, melancholy, and sadness. Alternatively, dark clouds moving toward you may be some type of warning.
Moods and feelings. Does your cloud have a silver lining?
Obscuration of a situation. Clouds can hide the sun and moon, temporarily removing them from sight. What are your clouds concealing?
Youthful imagination. Remember finding shapes in fluffy white clouds as a child? Try it again and see what meanings those shapes have for you.
In China, an emblem of sexual union and fertility, especially gently pouring rain clouds.
(see Ascent, Fog, Rain, Snow)