Final answer:
Cyclones, anticyclones, troughs, and ridges occur at a regional scale.
Step-by-step explanation:
The scale at which cyclones, anticyclones, troughs, and ridges occur is regional. These weather phenomena cover hundreds or thousands of square kilometers. For example, tropical cyclones, such as hurricanes, typhoons, and cyclones, occur in specific regions of the world, such as the North Atlantic, North Pacific, and Indian Ocean.