How Do Tornadoes Form?
1. Warm Air Meets Cold Air
One of the essential ingredients needed for a tornado to form is for warm, moisture-laden air to meet cooler, dryer air. Warm air is less dense than cold air so, when the two meet, the warm air will be forced to rise, taking its moisture with it. This is why tornadoes are more likely to form at certain times of the year, such as the start of summertime when warmer air fronts are moving across the country. They can, however, form at pretty much any time of the year provided the conditions are right. While they are best known for forming in Americas Great Plains, they also occur in many other places in the world.
