Why the right side of a tropical cyclone is the most dangerous. Support our work. Become a Vox Member today: http://www.vox.com/memberships The “dirty side” of a hurricane refers to the part of the storm that usually brings the highest impacts: the greatest winds, greatest tornado risk, and greatest storm surge and flooding. In the case of Atlantic hurricanes, which rotate counterclockwise, the “dirty side” is on the right — where the winds are moving in the same direction as the storm, combining their speeds. This is why the greatest risk of storm surge during a hurricane is at the center of the storm, in the “eyewall,” and to the right of it, where the forward-moving winds push water onto shore. Because the center of the storm is the strongest, forecasters tend to focus on tracking it, using a popular tool called the “forecast cone,” which shows the potential path of the center of a storm, but leaves out the wider impact areas. So many viewers of hurricane forecasts don’t realiz