Clouds boiled low to the ground so that the mountains could not be seen.

A great black cloud, almost purple in its darkness, boiled out of the west.

Great clouds of smoke boiled from them and filled the chamber.

Silvered clouds boil slowly around a sun too bright to look at.

He cast a suspicious eye at the sky as black clouds boiled quickly into sight.

His head fell back on a pad, and black clouds boiled in his eyes.

I stood on the front porch and watched them speed away, a cloud of dust boiling behind the truck until it stopped at the river.

Behind all this was the blue Himalayan sky in which grey and white clouds boiled.

A dark cloud ribbed with fire boiled up and fell apart in the teeth of the wind.

Pristine clouds boiled across nearly half of the visible surface, generated by the relentless heat.