California's Sierra Snowpack Reaches Historic Levels.

California's Sierra Nevada snowpack is among the largest ever on record, bringing relief that the three-year drought is easing, but also raising concerns that the monster snowpack could bring dangerous flooding as it melts through spring and summer. The statewide snowpack is 227% of average for the date, according to the California Department of Water Resources. The melting snowpack could cause dangerous flooding this spring and summer, and experts say that climate change will lead to more intense periods of drought and more severe flooding for California.