The saturated ground from last week's rainfall heightens the risk of flash flooding, particularly in northern Arizona, New Mexico, southern Colorado, and southern Utah. Areas of concern include the Phoenix metro's north and east sides, the Four Corners region, and San Diego County's foothills. Burn scars from recent wildfires are especially vulnerable to debris flows. Additionally, hikers in southern Utah, southern Colorado, and Arizona are advised to avoid slot canyons due to the potential for life-threatening flash floods. Over higher elevations, snowfall in the Sierra could create slippery travel conditions on mountain passes.