Tornado Alley (Seyana)

Tornado Alley is a colloquial term for the area of the United States where tornadoes are most frequent.

Although the official boundaries of Tornado Alley are not clearly defined. The main alley originally extended from northern Texas, through Oklahoma, Kansas, Nebraska, Missouri, Iowa and South Dakota.

As the 21st century continued, the Tornado Alley had largely shifted eastward, towards the states east of the Mississippi River, while tornadoes in the Great Plains, especially in Oklahoma, Kansas, and Texas were becoming less common. The 2029 Moore-Oklahoma City tornado, part of a larger tornado outbreak across Oklahoma, parts of Kansas and Texas, the South, the Midwest, and Pennsylvania, was among the last major (EF4+) tornadoes that struck the Great Plains area. The next major tornadoes in the Great Plains became largely rare, with the next major ones happening in the 2080s, 2110s, and the 2140s prior to the volcanic eruption in 2153, which affected the climate around the world.

By the 2040s, the New Tornado Alley consisted of the Southeast US, Indiana, Ohio, Arkansas, Louisiana, and Kentucky. In 2053, Memphis was struck by an EF5 tornado, causing even more damage than the 2029 Moore-Oklahoma City tornado and becoming the top five costliest US tornadoes on record, and also started off a trend with tornadoes striking large cities becoming more common. The early to mid 22nd century saw tornadoes causing havoc in places such as Philadelphia, Atlanta, Raleigh, and Columbus. An EF5 tornado also struck New York City in 2148, and caused major damage in the Bronx and upper Manhattan.

After the VEI-7 eruption at Valles Caldera in 2153, the Earth cooled significantly, and led to tornadoes becoming rare in the Southeast and East Coast for the next several years, and more common in the Great Plains. In conjunction, efforts were also underway to reverse the effects of climate change and begun a trend of returning the Earth to normality.

By the early 23rd century, the Tornado Alley largely shifted back towards its original defined location.