The temperature in New York City has reached 100 degrees as the eastern U.S. sweltered under an extreme heat wave.

The temperature was forecast to reach 99 degrees or higher on Tuesday, which could cause some voters, especially older ones, to stay home.

"Whatever was already going to happen ... all that is still going to happen. But when it happens, it's going to be worse." Extremely dangerous heat wave breaks temperature records last seen in 1888 — here's what you need to know about this potent heat dome first appeared on The Cool Down.