close SEE IT: Hawaii swamped by flash flooding More than 5,500 residents on Oahu’s North Shore are under mandatory evacuation orders as catastrophic flash flooding pushes the 120-year-old Wahiawa Dam to the brink of failure. NEW You can now listen to Fox News articles! A California tourist has vanished in Costa Rica after severe flash flooding and mudslides struck the region during her hike, sparking a desperate search that has now been stalled by torrential rains. Ashley Phillips, 30, has been