The National Weather Service has issued a heat advisory for Palo Duro Canyon, Texas, effective from noon today through Wednesday evening, as temperatures are expected to exceed 101°F (38°C). This poses significant risks, particularly for tourists exploring the canyon, which is the second-largest in the United States. The advisory emphasizes the dangers of heat-related illnesses such as heatstroke and heat exhaustion, which can be severe and even fatal, especially for vulnerable populations including the elderly, young children, and individuals with pre-existing health conditions.