I am tracking some of the hottest temperatures of the summer and nearing record potential this weekend. A Weather Authority First Alert Action Day is EXTENDED into Monday for the continuing extreme heat. YUMA, Ariz. (KYMA) - An Extreme Heat Warning is staying in effect and has been EXTENDED for the yet again until 8 p.m. Monday for the entire Desert Southwest due to major and extreme heat risk. Take a look at the National Weather Service heat risk chart to see how this heat will impact your weekend. With the high heat, especially this weekend, make sure to practice heat safety at all times.