The heat wave poses significant risks, particularly for those without access to cooling or hydration. Emergency room visits for heat-related illnesses are expected to surge, and overnight lows will remain nearly 10°F (5.5°C) above normal, offering little relief. The heat is exacerbating wildfire risks and water shortages, especially in the Colorado River Basin, where below-average snowfall and historic low reservoir levels are already a concern. Energy and water supplies may also be strained as evaporation rates increase. Coastal areas in Southern California face additional hazards from large waves and rip currents caused by Hurricane Genevieve.