Why is it called Doppler radar?

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Tags

1. #doppler
2. #measures
3. #toward
4. #movement
5. #determine
6. #atmosphere
7. #which
8. #objects
9. #forecasting
10. #answer
11. #direction
12. #precipitation
13. #effect
14. #called
15. #radar
16. #whether
17. #weather
18. #speed
19. #horizontally
20. #aides
21. #drops
22. #velocity