The extreme heat poses risks of heat-related illnesses, particularly for vulnerable populations such as the elderly, children, and outdoor workers. The warm overnight temperatures will provide little relief, increasing the risk of heat stress. Isolated thunderstorms in the higher terrain could lead to localized gusty winds and light rain, but significant impacts are not expected in the Phoenix metro area. Residents in the High Country should remain cautious of scattered storms, which may bring brief heavy rain and lightning.