HURRICANE Harvey caused terrible flooding in the US in 2017, killing 68 people. One reason it hit regions including Texas (pictured) so hard is that it moved unusually slowly, affecting the same area for days. As the world warms, there are going to more slow-moving storms like this, according to Gan Zhang at Princeton University and his colleagues. They ran about 100 high-resolution simulations of how tropical cyclones behave in three types of conditions: those in the past from 1950 to 2000, those similar to the present and those in various future scenarios.
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