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The UK has more tornadoes per square mile than any other country, with an annual average of 34, but they are usually weak. The Thames Valley is Britain’s Tornado Alley. The US experiences the most tornadoes, with about 1,200 reported annually, some of which can be devastating. Canada experiences far fewer tornadoes than the US.
The United States leads the world in experiencing the most tornadoes, which commonly sweep through the Midwest and Southeast, typically in late spring or early summer. About 1,200 twisters are usually reported annually. But more tornadoes per square mile are reported in the UK than anywhere else on the planet. Few of the 34 annual average tornadoes that strike Britain are very strong, with 95% classified as F0 or F1 storms, meaning maximum wind speeds of 112mph (180km/h). A 2015 study conducted at the University of Manchester pinpointed where twisters are most likely to land. The Thames Valley, between Reading and London, is Britain’s Tornado Alley.
Take cover, North America:
On average, the UK sees 2.2 tornadoes per 10,000 square kilometers (3,861 sq mi). They are most likely to strike between May and October, but can actually occur at any time of the year.
In the United States, tornadoes can develop into devastating F5s, with estimated wind speeds of over 300 mph (483 km/h), resulting in significant property damage and loss of life.
Canada is larger than America in terms of land mass, yet experiences one-tenth the number of tornadoes. Together, the United States and Canada account for 75% of the world’s twisters.
