LAUSR

Flash droughts have occurred frequently worldwide, with a rapid onset that challenges drought monitoring and forecasting capabilities. However, there is no consensus on whether flash droughts have become the new normal because slow droughts may also increase. In this study, we show that drought intensification rates have sped up over subseasonal time scales and that there has been a transition toward more flash droughts over 74% of the global regions identified by the Intergovernmental Panel on Climate Change Special Report on Extreme Events during the past 64 years. The transition is associated with amplified anomalies of evapotranspiration and precipitation deficit caused by anthropogenic climate change. In the future, the transition is projected to expand to most land areas, with larger increases under higher-emission scenarios. These findings underscore the urgency for adapting to faster-onset droughts in a warmer future. Description Dry in a flash Are flash droughts, those that develop unusually rapidly unlike those that develop more slowly and typically have been considered the archetype, becoming the new normal? Yuan et al. show that droughts have begun to intensify more rapidly since the 1950s and that flash droughts have become more common over much of the world (see the Perspective by Walker and Van Loon). This trend, which makes drought monitoring and forecasting more difficult, is associated with greater evapotranspiration and precipitation deficits caused by anthropogenic climate change and is projected to expand to all land areas in the future. —HJS Anthropogenic climate change is driving a global transition toward more frequent flash droughts.