BBC film crew chase tornado in Colorado

The interaction between the Earth’s orbit and its tilt is the driving force behind extreme weather events such as tornadoes. Dr Helen Czerski visited the mid-western state of Colorado – part of the area known as Tornado Alley – to investigate how tornadoes form with the help of atmospheric scientist Josh Wurman. No two tornadoes are the same, but they all need certain conditions to form – in particular intense heat. The final episode of Orbit: Earth’s Extraordinary Journey is on BBC2 at 2100 GMT on Sunday 18 March and is available online afterwards on the BBC iPlayer.

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