Friday AM forecast: Heat returns this weekend! Two weather stories will shape the forecast through the weekend as the last impacts from Bertha end today while dangerous heat quickly returns. Afternoon highs will reach the middle 90s, while heat index values climb into the lower 100s. Heat index values are expected to remain just below advisory levels today and Saturday before reaching Heat Advisory criteria Sunday. By Monday through Wednesday, peak heat index values of 110 to 115 degrees are possible, making a prolonged period of dangerous heat increasingly likely.