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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 storm’s center 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 realize a storm’s impacts reach far beyond the cone, particularly on the right-hand side of the storm.
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