Kazan....its probably a priorities thing. I don't think European weather is as drastically changing as the patterns in North America. Within a 4 hour travel radius of my house I can have tornadoes, servere thunderstorms (with hail, downbursts, etc.), water spouts, blizzards, clippers, streamers, and a whole host of other types of weather events with temperatures going towards 30c and higher in the summer and below -15c in the winter.
It pays big money to have a sophisticated system capable of warning people about all of the potentially severe and destructive weather. Now I haven't specifically studied weather comparisons between various locations in the world but I think North America does rank up there in having a huge range of types in populated areas. Not to mention that the continent is divided between two large nations with weather forcast requirements and the money and resources to establish a standardized system across the board.