In this folder, you'll find layers for each of the currently active storms of the 2008 Hurricane Season, including hurricanes, cyclones, and tropical storms. These layers, courtesy of the National Hurricane Center, include 72-hour forecasted storm center positions, potential 72-hour storm track areas, and associated advisories (to paraphrase the words of fellow Minnesotan Bob Dylan, they tell you the story of the hurricane).
The forecasted center positions are represented by the hurricane-like icons and correspond in size and shape to the intensity and type of storm. As these are estimated positions, potential storm track areas are also included, represented by the red polygons. These polygons encapsulate the relative uncertaintly of the forecasted center point, so that two-thirds of historical forecast errors for a given timestep fall within this boundary. So in other words, these areas represent the areas most likely to be affected by the storm at a given time.