Fresh water from rivers and rain makes hurricanes, typhoons, tropical cyclones 50 percent more intense

An analysis of a decade's worth of tropical cyclones shows that when hurricanes blow over ocean regions swamped by fresh water, the conditions can unexpectedly intensify the storm. Although the probability that hurricanes will hit such conditions is small, ranging from 10 to 23 percent, the effect is potentially large: Hurricanes can become 50 percent more intense, researchers report in a study appearing this week in Proceedings of the National Academy of Sciences Early Edition.

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