If that were all there is to it, few clouds would form.

The same thing happens on a larger scale when clouds form.

A cloud formed before her face with every breath she took.

Her voice broke through the red cloud forming around him.

The big guy dropped into the water like a lead weight, a red cloud already forming around him.

"Clouds can form many things if one watches them," he returned.

He frowned, and a large black cloud formed above him.

There over the water a nasty little cloud was forming.

Dark clouds of smoke formed over the scene, visible from miles away.

The sky had begun to turn dark, fat black clouds forming to the south.