Figure 4.13

Cyclones. Midlatitude cyclones and tropical cyclones (or hurricanes) both develop counterclockwise rotation in the Northern Hemisphere as air flows toward an area of low pressure (as shown by the arrows). (A) A satellite image of a midlatitude cyclone over Lake Michigan on September 26, 2011. (B) On August 25, 2011, Hurricane Irene was a tropical cyclone just off the coast of Florida. It later struck several states to the north, including North Carolina and New York.

(NASA)