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Rick Hinterthuer of Fayetteville, Ark., takes a drink of water and packs several more bottles in his backpack before hiking the Doe Mountain Trail in Sedona on Friday morning. VVN/Vyto Starinskas

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Summer Days: Emergency and medical professionals warn that downside of heat stroke is death

YAVAPAI COUNTY -- The threat of excessive heat in the Verde Valley will continue until 8 p.m. Monday night, according to the National Weather Service.