When & where
Tornadoes can happen at any time of the year and at any time of the day. In the southern states, peak tornado season is March through May. Peak times for tornadoes in the northern states are during the summer. A few southern states have a second peak time for tornado outbreaks in the fall. Tornadoes are most likely to occur beween 3p.m and 9p.m.
The geography of the central part of the United States, known as the Great Plains, is suited to bring all of the ingredients together to forms tornadoes. More than 500 tornadoes typically occur in this area every year and is why it is commonly know as "Tornado Alley". Texas, Oklahoma, Kansas, Nebraska, South Dakota, North Dakota, Iowa, Missori, Arkansas and Louisiana all make up Tornado Alley.