The J.S. Marshall Radar Observatory (or MRO) is a McGill University facility in Sainte-Anne-de-Bellevue, Quebec, Canada housing several weather radars and other meteorological sensors, many of them running around the clock. It is one of the components of the McGill Atmospheric and Oceanic Sciences department where students in remote sensing perform their research. The main radar was part of the Canadian weather radar network, on contract with the Meteorological Service of Canada, as well as a research device, up to October 3, 2018.