Kansas City, Missouri is affected by both continental tropic and maritime tropic air masses in the summer, and continental polar and continental arctic air masses in the winter season, and in the fall and spring they all interact together which is why Kansas City has tornado seasons.
 
Kansas City experiences Mid-Latitude cyclones, it experiences Cold frontal system this area experiences comes from the cold air masses Continental Polar, and Continental arctic are masses, as well as the Aleutian low  moving cold denser air forces warm moist air from the Gulf of Mexico up and over, and if there is then rotation in-between the air masses there could be a tornado formed, if it makes contact with the surface.


The most unique factors for this area, are the high tornado, this is due to the Rocky Mountains, The way the Rocky Mountains formed causes a funnel for all the cold air up north  near Canada south toward the Gulf of Mexico, Because the cold dry air is dense it is unable to lift over a topographic barrier, so it moves south hitting warm moist air masses. If the two air masses then start to rotate you can get tornadoes. 80% of the total tornadoes in the world happen in this area called Tornando Alley.