Hot, humid air contains a huge amount of energy. Such conditions often indicate instability,which can lead to thunderstorms powered by this thermal energy. Given a few other conditions these thunderstorms can produce tornadoes.
Tornadoes are least likely to form in association with a warm front, though it can happen.
Antarctica is very cold while tornadoes can only form with thunderstorms, which require at least some degree of warm, moist air.
There is not particular temperature at which tornadoes form. It is common, however, for the weather to be hot and humid before a tornado and its parent thunderstorm come through and to be cooler afterwards.
Tornadoes occur in warm places because warm air at the surface rises and interacts with cooler air aloft, creating unstable atmospheric conditions that can lead to the formation of severe thunderstorms and tornadoes. The contrast in temperature and moisture between warm and cool air masses can trigger the intense rotating updrafts necessary for tornado development.
Tornadoes happen most in the United States in a place called 'Tornado Alley'. They mostly happen there because of the air. Tornado Alley is in the middle of the United States. So cold air from higher up in the world comes down and meets hot, humid air from down lower by the Equator. That hot air comes up and that's how the two airs meet. Then they form tornadoes.
Tornadoes can happen at any time of the year, but they are most common in the spring and summer months when warm, moist air masses collide with cold, dry air masses. Tornadoes can occur in other seasons as well, depending on weather conditions.
Tornadoes can happen in any place that gets thunderstorms.
Tornadoes can form any time of year but are more common in spring and early summer when warm, moist air collides with cold, dry air. This typically occurs in regions like Tornado Alley in the central United States.
Tornadoes themselves are neither hot nor cold; they are rapidly rotating columns of air. However, tornadoes can be associated with both hot and cold weather systems depending on the conditions that give rise to their formation.
Tornadoes happen in Miami for the same reason they happen anywhere else. See the related question for how tornadoes form in general.
The central United States, often referred to as "Tornado Alley," is a hot spot for tornadoes due to the collision of warm, moist air from the Gulf of Mexico with cold, dry air from the Rocky Mountains. States like Oklahoma, Texas, Kansas, and Nebraska experience a high frequency of tornadoes each year.
A tornado can happen when the wind spins in a circle, wind spins around near and during a thunderstorm, and when hot and cold air meet. Most tornadoes happen May - August, summer for most people. But be aware, tornadoes can happen any time, anywhere, and in any thunderstorm or hurricane