Maui experienced a two-category increase in drought severity in just three weeks from May to June, with that rapid intensification fitting the definition of a flash drought, said Jason Otkin, an atmospheric scientist at the University of Wisconsin, Madison.Otkin co-authored an April study that shows that flash droughts are becoming more common as Earth warms by human-caused climate change. A 2016 flash drought was connected to unusual wildfires in Gatlinburg, Tennessee, he said.