Parts of northeast Oklahoma will be under a heat advisory this afternoon.

The National Weather Service expects heat index values to reach the upper 90s in Tulsa and surrounding counties where power outage and cleanup efforts continue. The heat advisory will be in effect between 1 and 9 p.m. today. This weekend is set to be a hot one, with the possibility of a heat index of 104 for Coffeyville on Saturday. By next week, temperatures in southeast Kansas are expected to break 100.