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The classic answer for how tornado form states that warm and cold air come together and swirl up, or something to that effect.

Many tornadoes are associated with cold fronts (where cooler air pushes into warmer air) and on occasion are associated with warm fronts (where cold air retreats and warm air comes in. However the front is not the direct cause of the tornado. The front lifts the warmer air which, if there is enough instability, can trigger thunderstorms. Given a few other conditions such as wind shear these storms can start to rotate and potentially produce tornadoes.

However, these storms do not necessarily form along a warm or cold front. Many tornadic thunderstorms form along a dry line, where dry air pushes into moist air with relatively little temperature difference. In fact a dry line is often better at producing tornadic storms than a cold front is. Tornadoes can also form in the thunderstorms generated by tropical cyclones (hurricanes, tropical storms etc.) where there are no notable boundaries such as those discussed above. On rare occasions tornadoes can form with thunderstorms that develop in the absence of an organized system. However such tornadoes are short lived and weak.

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Q: What is the classic answer for how tornadoes form and why it is wrong?
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