Stratus clouds commonly form when warmer, moist air is advected (pushed by the winds) into a block of colder air and is forced up over cooler, dense air until the moistures condenses out to form a thick blanket of clouds.
Stratus clouds commonly form when warmer, moist air is advected (pushed by the winds) into a block of colder air and is forced up over cooler, dense air until the moistures condenses out to form a thick blanket of clouds.