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Heat wave spurring a heavy snow melt

May 02, 2017 - The San Francisco Chronicle

The historic snow that piled up in the Sierra this winter has started to come down a mountain melt-off that's swelling rivers and creeks with a dazzling, and potentially dangerous, flow of water.

Several waterways, including Yosemite Valley's Merced River, are expected to approach and even surpass flood stage in coming days as a warm spell keeps overnight lows on many snow-covered peaks above freezing for the first time this year, accelerating the thaw.

Water experts say the heavy sp...