Kansas City is near "Tornado Alley", a region where cold air from the Rocky Mountains and Canada meets warm air from the Gulf of Mexico. This situation causes the formation of powerful storms. The most recent tornado to strike Kansas City itself was in May 2003. The region is also prone to ice storms, such as the 2002 ice storm during which hundreds of thousands lost power for days and (in some cases) weeks. The MoKan area was subject to flooding, including the Great Flood of 1993 and the Great Flood of 1951.