Doppler Radar - Hurricane tracking

http://www.noaanews.noaa.gov/stories/s1192.htm 

A Doppler radar, such as this one on the NOAA website, is helpful for tracking weather events, such as hurricanes.  The velocity data gathered by the radar using the Doppler effect is displayed on this map, forming the well-known circular shape of a hurricane with its eye in the middle (low velocity).  The different colors represent different precipitation intensities.  We can see on this map that for the most part, the hurricane is pretty middle to high intensity (mostly yellow and green) and that the eye is currently on the shore.