How do tropical storms form BBC News

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=4xI1cqyUf74

Subscribe to BBC News / bbcnews • The BBC's John Hammond explains the factors necessary for a tropical storm to form. • Subscribe / bbcnews • Check out our website: http://www.bbc.com/news • Facebook: / bbcworldnews • Twitter: / bbcworld • Instagram: / bbcnews

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