California's Snowpack Melts Rapidly, Raising Flood Concerns.

An incoming heat wave in California is expected to trigger rapid snowmelt on the slopes of the Sierra Nevada, causing more flooding in portions of the San Joaquin and Owens valleys this week. The warmth will descend upon some of the state’s deepest snowpack ever recorded, with the southern Sierra still measuring 256% of normal for the date. State officials have deployed thousands of emergency personnel across California in response to this year’s flooding, and resources will continue to be made available to respond to local conditions.