Alex Hall: CBS News, Will the atmospheric rivers drenching California beat back devastating drought? “It’s very unpredictable.”

Atmospheric rivers are very important — “the main source for moisture for the western part of the U.S., especially the coastal states,” said Alex Hall, director of the Center for Climate Science at UCLA.

But the deluge may not be enough to beat back California’s devastating drought.

“We are getting exactly what we need to bust the drought, but we still have two-thirds of the wet season to come and we could get very little precipitation,” said Hall. “You know, it’s very unpredictable.”