Doppler Effect - Full explanation The Doppler Effect is the change in the frequency or wavelength of a wave as observed by someone moving relative to the source of the wave. In Simple Terms: When a source of sound (or light) moves towards you, the waves are compressed, you hear a higher pitch (higher frequency). When the source moves away, the waves are stretched, you hear a lower pitch (lower frequency). Common Example: Imagine an ambulance driving past you: • As it approaches, the siren sounds

Here's a look at Doppler 12, Max Radar, and Futurecast...find out where the rain is now, and how your Friday is shaping up. | KXII-TV

Latest Doppler radar loop shows rain moving from west to east quickly across SoCal with rates of less than 0.10"/hour. Light to moderate rain will continue this morning with showers becoming more scattered this afternoon. | US National Weather Service San Diego California