Sauna-like conditions on Friday are threatening to break records in major Northeast cities during summer’s hottest month after dangerous heat peaked Thursday in the central United States. More than 80 million people in the eastern half of the US are under at least a Level 3 of 4 “major” heat risk on Friday,

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.

Friday marked our hottest day of the year so far, with a high temperature of 99° at DFW Airport. Parts of North Texas reached triple-digit temperatures, though, including Fort Worth.