Doppler radar station.
| Doppler Radar
The weather radar system that uses the Doppler shift of
radio waves to detect air motion that can result in tornadoes and precipitation.
It can also measure the speed and direction of rain and ice, and detect
the formation of tornadoes sooner than older radars.
The Doppler effect, or Doppler shift, is the
apparent change in frequency of sound or light waves, varying with the
relative velocity of the source and the observer. It the source and observer
draw closer together, the frequency is increased. It is named for Christian
Doppler, an Austrian mathematician and physicist (1803-1853).