The tornado alley shifted east, with increased tornado activity moving from the traditional Great Plains, "Texas, Oklahoma, Kansas", towards the Midsouth and Southeast and impacting states like Tennessee, Arkansas, Mississippi, Alabama, and Missouri, partly due to climate change altering moisture and patterns.
The shift means that more frequent and intense tornado outbreaks are occurring in the Dixie Alley region, which was a change that was driven by warmer Gulf waters and different atmospheric setups.
The worst tornado in history was the Tri-State Tornado that occurred on March 18th, 1925, which was the single deadliest tornado in the history of the United States.
The Tri-State Tornado that occurred in 1925 on March 18th killed at least 20 farm owners in southeastern Illinois and southwestern India.
In the midday and the afternoon hours of Wednesday, March 18th, 1925, the Tri-State Tornado which was the deadliest tornado in United Stats history and the second deadliest tornado worldwide moved through Eastern Missouri, Southern Illinois and Southern India, killing 695 people and also injuring 2,027 more people.
The damage done by the Tri-State Tornado in 1025 was $16.55 million in $1925 dollars which is equal to $2.9 billion now.
The cause of the Tri-State Tornado was a result of the collision of warm and moist air from the Gulf of Mexico with cool, dry air from the west, which created a highly unstable atmosphere.
The clash of air masses, when combined with a powerful low pressure system and strong winds at different heights, fueled the long lived supercell thunderstorm, which produced the tornado.
The highly favorable setup occurred at the triple point where the warm front, cold front and dry line met, maximizing low level convergence and opment.
A low pressure system pulled warm, moist air northward, while cooler, drier air moved in from the west.
Where these air masses met, they created a highly unstable atmosphere.
Another baddest tornado or worst tornado was the 1989 Bangladesh tornado of (Manikganj/Saturia).
The 1989 Bangladesh tornado of (Manikganj/Saturia) killed around 1,300 people.