Here's a breakdown:

* Low-level clouds are generally found below 6,500 feet (2,000 meters).

* Mid-level clouds are found between 6,500 and 20,000 feet (2,000 and 6,100 meters).

* High-level clouds are found above 20,000 feet (6,100 meters).

Stratus clouds are known for their flat, gray appearance and often bring drizzle or light rain.