Low-lying cloud is a term used to describe clouds that are close to the ground and form a layer of cloud cover. The two most common types of low-lying clouds are STRATUS (7 letters) and FOG (3 letters). STRATUS clouds are flat, grey clouds that form a continuous layer of cloud cover, while FOG is a type of cloud that forms when water droplets condense in the air near the ground. Both STRATUS and FOG can reduce visibility and create hazardous conditions for drivers.