Open Cells
Warm air rises on the sides of a cell, water vapor condenses to form clouds, and air sinks in the middle of the cell. This leaves clear sky surrounded by a ring of clouds.
![](img/OpenSchem.jpg)
![](img/OpenCells1.jpg)
Closed Cells
Warm air rises in the middle of a cell, water vapor condenses to form a cloud, and air sinks on the sides. This leaves clear sky around the cloud.
![](img/DryCells3.jpg)
![](img/CloseSchem.jpg)