A Heat Advisory will go into effect for much of northeast Oklahoma and portions west-central Arkansas from 1 PM until 8 PM this evening for heat indices reaching up to 106F, locally higher, this afternoon. The heat will further intensify and become more widespread across eastern Oklahoma and western Arkansas on Monday and especially on Tuesday. Stay inside air conditioned buildings, if possible, drink plenty of fluids if outdoors for prolonged periods of time, and wear lightweight, loose-fitting, and light-colored clothing, and take frequent breaks if working outside over the next few days.