Atmospheric rivers carry unfathomable amounts of water across the sky, bringing moisture to drought-stricken regions like the Western U.S. But whether a particular incoming atmospheric river storm will result in disastrous flooding has long been difficult for researchers to determine with confidence. Now, a new DRI-led study demonstrates that accounting for soil saturation levels can substantially improve our early warning of potentially destructive flooding events. The research, published February 12th in Nature Communications, was led by DRI hydrologist Mariana Webb. She and her team examined more than 71,000 atmospheric river storms in the Western U.S. and central Chile to improve flood hazard early warning.