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Story summary
- Yosemite National Park officials warn of dangerous conditions in the park's waterfalls and rivers due to Sierra Nevada snowmelt.
- Water temperatures around 40°F (4°C) can cause cold shock and raise drowning risk.
- The warning follows a five-year-old drowning at Shasta Lake, illustrating the danger of frigid waters.
- Officials urge visitors to stay back from edges, supervise children, and float on the back with feet pointed downstream if someone falls in.
