The rains were sparked by what local forecasters call a shear line, a point where warm and cold air meet. At least 20 storms and typhoons lash the Philippine archipelago each year, especially during the rainy season that starts in June.In 2013, Typhoon Haiyan, one of the strongest to hit on record, left more than 7,300 people dead or missing, flattened entire villages, swept ships inland and displaced more than 5 million in the central Philippines.
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