More specifically, do not hike below the rim during the excessive heat warning because it can lead to heat stroke, heat exhaustion, hyponatremia and death, NPS said.
The National Weather Service issued an excessive heat warning for the canyon which will go into effect Thursday at 8 a.m. and last until 8 p.m. Friday. In a release, officials say temperatures in the shade will range from 105-111 degrees.
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