"Parts of the world will have weather patterns that switch between extremes of wet and dry, say scientists.
The US will see more droughts while flooding will become more common in the western Pacific, research suggests.
The study, in Nature Climate Change, adds to a growing body of evidence over climate change and extreme weather.
The latest data - based on detailed climate modelling work - suggests extreme La Nina events in the Pacific Ocean will almost double with global warming, from one in 23 years to one in 13 years.
Most will follow extreme El Nino events, meaning frequent swings between opposite extremes from one year to the next."
New research is showing that the old phase is now being doubled just as they had found for the warm phase and while individual events can not necessarily be attributed to global warming more weather patterns are arrising that are a cause for concern.
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