It’s a great day to stay indoors, or at least out of the sun, if you can manage that because high heat and questionable air quality will be on tap.
The National Weather Service issued a heat advisory because heat-index readings are expected to run from 104 to 107 degrees in the afternoon.
The forecasters also posted a Code Orange air-quality alert until 9 p.m. because they expect ozone levels to be at or above healthy levels for people with breathing problems or young children or the elderly.
The heat index uses temperature and humidity to generate a number that tells how it is likely to feel for an average person.
Actual temperatures that go into that formula were being forecast to be just under 100 degrees Friday and again Saturday.
The only Triangle county not covered by the heat advisory is Orange, where the predicted high is 96 degrees.
The air-quality alert is for the entire region.