A significant heat wave is currently impacting millions of people across California, Arizona, and Nevada. The National Weather Service (NWS) has issued heat advisories, warning of dangerously high temperatures that are expected to peak on Friday and Saturday. Temperatures could reach up to 112°F (44°C) in some areas, particularly in valleys and lower mountain regions. Residents are strongly advised to stay indoors during the hottest parts of the day and to stay hydrated by drinking plenty of water. Avoiding strenuous outdoor activities is also highly recommended to prevent heat-related illnesses.