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Tim Grist Photography/Getty Images(NEW YORK) As heat waves persist and temperatures across the country continue to soar, the Centers for Disease Control and Prevention is reporting that emergency department visits nationwide have more than doubled in the last month. In the U.S., an estimated 2,891 out of 100,000 overall emergency department visits were associated with heat-related illnesses for the week of July 2, up from 1,142 for the week of June 11. ABC News chief medical correspondent Dr. Jennifer Ashton explained on Good Morning America Thursday that both extreme heat and humidity can be dangerous. "Our core temperature [is] normally 98.7 degrees. In an area where the temperatures are 100, 105 [degrees Fahrenheit], evaporation or heat dissipation is impaired," Ashton said. "That external heat being higher will heat us up and humidity is actually, if not more of a problem than the actual temperature because once it gets too hot and too humid for sweat to evapor

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