Most tornadoes in the US occur in an area called “Tornado Alley” that is perfect for twisters, due to warm moist air from the Gulf of Mexico mixing with cold dry air from the Rocky Mountains
The tornadoes that ripped through six states in the US on December 10 were some of the deadliest on record, with at least 90 people dead.
The main reason for that is geography. The central part of the US is unique in that there’s a large warm area of water just to the south , and a high range of mountains that extend from north to south. Once they meet, the moisture from the warm air begins to condense, forming clouds and the beginning of a thunderstorm.
The air coming from the Gulf moves slowly into the plains. Meanwhile the Jet stream from the mountains provides a steady stream of high, fast-moving air flowing east. Because the Jet stream is flowing faster and in a different direction, it causes the Gulf, when below, to rotate like a spinning football. When the spinning air gets pulled into the updraft it is tilted but continues to spin – causing the entire updraft to rotate.” and they create prime conditions for tornadoes.
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