billow

During the preceding afternoon a heavy North Pacific fog had blown in … Scudding eastward from the ocean, it had crept up and over the redwood-studded crests of the Coast Range mountains, […], billowing steadily eastward, it had rolled up the western slopes of the Siskiyou Range, […]

Her new green flowered-muslin dress spread its twelve yards of billowing material over her hoops and exactly matched the flat-heeled green morocco slippers her father had recently brought her from Atlanta.