As the convection progressed east, hundreds of damaging wind reports and numerous tornado reports were received. A mesoscale convective system developed across eastern Texas early on January 2, aided by the combination of a strong upper-level trough, a moderately unstable atmosphere, and sufficient moisture. The risk area was shifted eastward and heightened to an enhanced risk the following day, with the SPC warning of the potential for damaging wind gusts and a strong tornado or two. On December 31, a slight risk of severe weather was noted from southeastern Texas through far western Alabama. On December 26, 2016, the Storm Prediction Center noted the potential for a severe risk to evolve across the Southern United States in the extended range. This is nearly 4 times the monthly average of 35, and the most active January since 1999. There were 142 preliminary reports of tornadoes in the United States in January, of which 135 were confirmed. See also: List of United States tornadoes from January to March 2017 § JanuaryĮxtreme levels of tornadic activity took place in January. 2017 also had four high risk outlooks issued by the Storm Prediction Center, making this the most active in the sense of high risk outlooks since 2011, which had a total of five high risk outlooks issued throughout the entire year.

The tornado season in 2017 started exceptionally early, having the second most active January since records began in 1950, and one of the most active first quarters in recorded history. Worldwide, 43 fatalities were confirmed in 2017: 35 in the United States, five in China, two in Paraguay, and one in Brazil. There were 1,522 reports of tornadoes in the United States in 2017, of which 1,418 were confirmed. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, Argentina and Australia. Strong and destructive tornadoes form most frequently in the United States, Brazil, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions.

This page documents notable tornadoes and tornado outbreaks worldwide in 2017.

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