From –Atmospheric rivers are double-edged swords.  In dry conditions, atmospheric rivers can replenish water supplies and quench dangerous wildfires; in wet conditions, they can cause damaging floods and debris flows, and cause damages that can cost hundreds of millions of dollars.  Their presence or absence can make the difference between drought, a normal healthy water supply year, or floods. To address the challenges atmospheric rivers present, the Center for Western Weather and Water Extremes (CW3E) was established at the Scripps Institute of Oceanography to advance scientific understanding of atmospheric rivers and their role in extreme events and to improve forecasting capabilities. (more)