VIDEO: What causes a tropical storm?

The Philippines are hit by more than 20 tropical storms a year, says the BBC’s Jay Wynne.

At least three or four turn into typhoons.

But why is the Philippines so susceptible to such storms? And what are the factors necessary for a tropical storm to form?

Article source: http://www.bbc.co.uk/news/science-environment-24873171#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

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