Doppler Radar is a special type of radar that uses the doppler effect to send electrical waves to the target and then have them bounce back to show the size and or shape of the intended target. It is most often used in weather for checking day to day cloud cover, or as we see here, to check the status of a huge storm such as Hurrican Katrina.
http://www.google.com/imgres?imgurl=http://www.katrina.noaa.gov/images/katrina-08-28-2005.jpg&imgrefurl=http://addins.wrex.com/blogs/weather/2007/08&usg=__JS6wWQORIecoXJ4KbXdRatgue4c=&h=1200&w=1920&sz=933&hl=en&start=1&sig2=15PepetJj32A1RcCxb_Q2g&zoom=1&um=1&itbs=1&tbnid=IzVw7n7fcGRcYM:&tbnh=94&tbnw=150&prev=/search%3Fq%3Ddoppler%2Bradar%2Bkatrina%26um%3D1%26hl%3Den%26rlz%3D1T4ADFA_enUS340US340%26tbm%3Disch&ei=S-fwTbbDH4G3tgek1-SWAw
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