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http://www.nssl.noaa.gov/about/history

…NSSL's commitment to improve our knowledge of severe weather and to develop new tools to better forecast and warn of its hazards has endured for more than half a century. View an interactive, multimedia timeline of NSSL's major accomplishments → Here is a list of the highlights: …

https://en.wikipedia.org/wiki/Radar

Object detection system using radio waves Long-range radar antenna , used to track space objects and ballistic missiles. Radar of the type used for detection of aircraft. It rotates steadily, sweeping the airspace with a narrow beam. Radar is a system that uses radio waves to det…