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.

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

A Heat Advisory is in effect from noon to 9 pm Thursday. Expect heat index values up to 107 with temperatures of 99 to 103. To beat the heat...Drink plenty of water, limit time outside to the cooler part of the day, know and recognize the symptoms of heat illness. pic.twitter.com/bHE4eucTSv