Meager precipitation and a premature spring thaw caused by unusually mild temperatures last month have left the U.S. Western mountain snowpack, a key source of fresh surface water for the region, at record low levels, the government reported Friday.
The latest snapshot was contained in an April survey issued by the U.S. Agriculture Department's Natural Resources Conservation Service.
Melting of winter snows began much earlier than usual this year, from the Sierra Nevada range in California to the lower elevations of Colorado's Rockies, leaving much of the Western snowpack greatly diminished or gone by early April, when it is typically at its peak.