You know how you know about Hurricane Irene three days before it hits land and ruins the East Coast? Doppler. Specifically, the NEXRAD Doppler system that's been tracking severe weather across the US of A since 1997.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/8JGrUMo2wk0/nexrad-how-scientists-spot-hurricanes-before-they-pancakes-entire-cities
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