http://thinkprogress.org/climate/2015/08/13/3691423/study-manmade-climate-change-texas-floods/

A new study directly links human-caused global warming to the
catastrophic flooding in Texas and Oklahoma this spring.

In May, more than 35 trillion gallons of water fell on Texas — enough to cover
the entire state in eight inches of water. More than two dozen people were
killed, and it was the wettest single month on record in both Texas and
Oklahoma.

A new peer-reviewed study from Utah State and Taiwanese researchers concluded,
“There was a detectable effect of anthropogenic [manmade] global warming in the
physical processes that caused the persistent precipitation in May of 2015 over
the southern Great Plains.”