NWS Forecast Office Phoenix, AZ

High pressure will build back over the region this week resulting in a steady warming trend each day. HeatRisk will rise into the Moderate Category tomorrow and into the Major category, with localized areas of Extreme, across the lower deserts by mid week. Shower and storm activity will be confined to the higher terrain for the majority of the week. Increasing moisture by the end of the workweek and into next weekend will result in a slight chance (10-25%) for storms returning to the lower deserts of south-central AZ.