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Tornado occurs in mass, temperature and humidity are different, see. The higher the temperature and the humidity are different. The clashes would be more severe, because the air mass deficiencies, to induce the "tornado channel" region is an area where there is a clash of air masses with intense cold, dry wind is from the West through to the East. At the same time, the air moisture from the Gulf of Mexico through the warm up towards the North. When we meet the high humidity, warm weather. Cold, dry lower House causes cloudy well throughout and if the humidity in the air is enough, it will cause rain and thunderstorms or storm.

Tornadoes often occur in areas where the air masses which have different temperature and humidity together. The temperature and humidity vary much. The collision was violent and more. The air condition must adjust the balance in "tornado funnel" is the area with the most severe clash of air masses. The cold, dry air from West blows toward the east. The warm moist air from the Gulf of Mexico blew up north. When met warm moist air to rise. Cold, dry air will float down. The cloud has covered the area. And if the humidity is high enough to cause rain or thunderstorm.