known informally as asperatus clouds, this atmospheric phenomenon gets its name from the latin aspero, a word used by romans to describe the sea as it was roughened by the cold north wind. though the cause of their formation remains unknown, it is likely that the lumpy, undulating underside of the clouds is a result of warmer, moister air from above meeting colder, dryer air from below, combined with high level wind passing over rolling terrain. despite their ominous appearance, these clouds tend to quickly dissipate.
photos, unless underlined, via the cloud appreciation society by (1) cate kelly in hanmer springs, new zealand; (2) merrick davies in hanmer springs; (3) til l in pioneertown, california; (4) tanis danielson in hanmer springs; (5) lamya deeb in longmont, colorado; (6) witta priester in hanmer springs; (7) laurie richards in hammer springs
But when the Valar entered into Eä they were at first astounded and at a loss, for it was as if naught was yet made which they had seen in vision, and all was but on point to begin and yet unshaped, … … Now the Valar took to themselves shape and hue; and because they were drawn into the World by love of the Children of Ilúvatar, for whom they hoped, they took shape after that manner which they had beheld in the Vision of Ilúvatar, save only in majesty and splendour. Moreover their shape comes of their knowledge of the visible World, rather than of the World itself; and they need it not, save only as we use raiment, and yet we may be naked and suffer no loss of our being. Therefore the Valar may walk, if they will, unclad, and then even the Eldar cannot clearly perceive them, though they be present.
– The Silmarillion, Ainulindalë
I can see how they clouds might be the initial embodiment of the Valar, if they so choose, while they go about homemaking. Until they settle on their individual raiment of choice.