With recent news of the devastating tornado in Oklahoma, Sam talks to Dr Kevin Trenberth from the National Centre for Atmospheric Research in Boulder Colorado and reveals what causes Tornados, why Tornado Valley is such a 'hotspot' and is climate change affecting tornado cycles.

Sources/further reading :
http://www.scientificamerican.com/article.cfm?id=kevin-trenberth-on-climate-change-and-tornadoes
http://www.bbc.co.uk/news/world-us-canada-22604251

Credits:
Oklahoma tornado footage courtesy :
NASA/NOAA GOES Project, Dennis Chesters

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