stratiform cloud

Stratiform clouds are a type of cloud that forms in a broad layer across the sky. They develop when air is mechanically forced upward and remains cooler than the surrounding clear air at the same altitude.1

Different types of stratiform clouds exist based on their altitude:
* Stratus: Low-level gray layers, often covering large areas. Advection fog is a stratus cloud at ground level.21
* Altostratus: Mid-altitude, dark gray layers.21
* Cirrostratus: High, thin layers that can cover the entire sky.21
* Nimbostratus: Low, dark gray layers that typically produce continuous light rain, snow, or sleet.21

Stratiform clouds are distinct from cumuliform clouds, which have puffy, turreted shapes and are associated with more turbulent air movements.1