California and Nevada Rivers at Risk of Flooding Due to Snow Melt and Heat Wave

NBC News is tracking river levels across California as heavy snowfall and rain have left the Sierra Nevadas with dozens of inches of frozen water, which will flow down rivers into the Central Valley during the big snow melt. Some parts of the state, like Tulare Lake in the San Joaquin Valley, are already flooding. The map below shows which rivers are at or above flood level and will be updated every morning.