The building maintenance scheduled for Friday February 27th at 5:00pm MST has been postponed until 5:00pm March 6th. PSD's website will be down during the maintenance.
 
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.

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.

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