The combination of high temperatures and humidity increases the risk of heat-related illnesses, particularly for vulnerable populations such as the elderly, children, and those with pre-existing health conditions. The elevated overnight temperatures will limit cooling opportunities, compounding the heat stress. Thunderstorms in the mountains and deserts may bring heavy rain, strong winds, lightning, small hail, and localized flooding. Residents in affected areas should remain vigilant for sudden weather changes and potential hazards.