Harvey's 'Biblical' rainfall is getting more likely

Aerial view of a flooded residential neighborhood in Houston, Texas. (Photo: Texas Military Dept)
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WASHINGTON (AP) - A new study says the chances of a hurricane flooding parts of Texas, like Harvey did, have soared sixfold in just 25 years because of global warming and will likely triple once again before the end of the century.

The study found that what was once an extremely rare rainfall event could soon be almost common.

From 1981 to 2000, the probability of 20 inches of rain happening somewhere over a large chunk of Texas was 1 in 100 or even less. Now it's 6 in 100 and by 2081, those odds will be 18 in 100.

The study, based on a set of computer simulations done by a scientist at the Massachusetts Institute of Technology, was released Monday in the Proceedings of the National Academy of Sciences.