Doppler radar

www.bom.gov.au/.../new_radar_services.shtml

This is a Doppler image from the Bureau of Meteorology in Australia. Doppler is a radar image and another form of remote sensing. Mostly, it is a forecasting tool that is extensively used in weather prediction. Doppler was the name of the scientist that discovered this particular principle that sound waves can be deflected. In today’s usage radar sends out radio waves which are deflected off of objects in the air such as rain snow, or hail; some waves are scattered and others are sent back to the radar antenna. The information is then electronically converted into pictures showing the location and intensity of precipitation.