Canadians who visit Florida and stay for long periods of time will soon have to deal with new immigration requirements.

Tornadoes can occur all around the world and have been recorded in all Canadian provinces and as far north as the Canadian arctic. In fact, Canada is the world's second-most tornado-prone country.

Tornadoes are often spawned during thunderstorms in the central and eastern U.S. when cold Canadian air mixes with warm, humid Gulf air. Over the past weekend, a tornado outbreak struck 13 states ...