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SEATTLE -- Weather forecasters are telling people to stay off the higher slopes of mountains in the Cascades and Olympics through this weekend because of extreme avalanche danger.

Meteorologist Kenny Kramer with the Northwest Weather and Avalanche Center says a heavy snowfall last week and expected sunshine and warm weather will make it very dangerous above 8,000 feet. He says hikers should particularly avoid Mount Hood, Mount Rainier, Mount Adams, Mount St. Helens, Glacier Peak and Mount Baker.

A 27-year-old Olympia man is presumed dead after he was apparently caught in an avalanche Saturday on Mount Rainier. Ten other climbers were able to escape from the slide.

Swimming dangers

With the nice weather this weekend, lakes and river will also be drawing crowds.

Seattle-King County health officials warn that lakes and rivers are still very dangerous and they advise to keep away from them.

Lifeguards on beachesare not on duty yet and the City of Seattle plans to open its beaches on June 26.

Last year 16 adults drowned, but there has not been a child drowning in any public health-regulated pool in four years. That includes community pools and those at apartments.

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