High Quality Content by WIKIPEDIA articles! The Canadian weather radar network consists of 31 weather radars spanning Canada`s most populated regions. Their primary purpose is the early detection of precipitation, its motion and the threat it poses to life and property. Each has a range of 256 km (159 mi) in radius around the site to detect reflectivity, and a range of 128 km (80 mi) for detecting velocity patterns (Doppler effect).