Can they be detected by radar ?

The Doppler effect on radio waves is manifested as changes in frequency. By utilizing the Doppler effect, the speed of a distant subject can be measured. The type of radar studied at the Okinawa Subtropical Environment Remote-Sensing Center is Doppler radar. When observing clouds with the help of Doppler radar, the speed of a raindrop can be measured; because of this, it is also possible to measure the speed of wind.