California Braces for Cold, Deadly Water Risks During Memorial Day Weekend.

California's Sierra Nevada snowpack has melted, causing rivers to turn into deadly torrents, resulting in at least seven deaths or missing persons this spring. Public safety officials have issued warnings ahead of the Memorial Day weekend, which is typically one of the busiest times of the year for outdoor summer recreation. The Governor's Office of Emergency Services has cautioned about fast-moving water and other dangerous conditions. Experts say muscle control can be lost in minutes in the cold water. People are urged to wear life jackets and call 911 if someone gets in trouble in the water.