![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3Fpsm6gxAUvliylSIxkJuWqeieGK8vuZDlUwxWtNCh3vstmiW1s3rh3sUJD4C9IrKflBpsXSwZjecZFKhlyVmG5zPTdvarsV6wC3o_L4YUfEDWaXhFNl8MJJE5hygi6tnolUs_SWt-AM/s200/tornado-doppler-radar050803b.jpg)
A doppler radar uses microwave signals. This image of the Oklahoma City/Twin Lakes Doppler radar was taken on May 8, 2003, showing the hook echo of an F4 tornado as it hit a GM plant in Oklahoma City.
URL: http://www.noaanews.noaa.gov/stories/s2097.htm
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