The 46^th congress of the Canadian Meteorological and Oceanographic Society (CMOS) will take place from May 29^th to June 1^st 2012 at the Montréal Hyatt-Regency Hotel in Complexe Desjardins in Montréal (Québec). This Congress is organized jointly with the 21^st American Meteorological Society (AMS) Conference on Numerical Weather prediction (NWP) and the 25^th AMS Conference on Weather Analysis and Forecasting (WAF). These two conferences are organized every other year outside the annual AMS meeting. In 2012, the Conferences will be held in Montréal and will be organized in collaboration with CMOS. A joint scientific committee has already been formed to organize the sessions on NWP and WAF, themes that are common to both groups. A special effort will be made to seek international participation on those topics. The Hyatt-Regency Hotel and its Conference Centre are located in the Complexe Desjardins in the heart of Montreal's Downtown, next to the Place des Spectacles (inaugurated in 2010). The city of Montreal becomes very lively during summer thanks to several festivals. You will have the opportunity to discover them during your stay in Montreal. The Local Arrangements Committee and the Scientific Committee are already working hard on the preparations for the 2012 Congress to welcome you here.