The National Weather Service has issued a heat advisory for parts of Alabama, with heat index values expected to reach up to 109 degrees, urging residents to stay hydrated and avoid sun exposure. Similar heat advisories are anticipated for the Four State Region as temperatures could exceed 105 degrees due to high afternoon humidity. In Chicagoland, high heat and humidity will increase by midweek, with temperatures possibly reaching the low 90s. A dense fog advisory is in effect for several counties in South Alabama until 9 a.m. Sunday, posing hazardous driving conditions. Scattered thunderstorms and showers are predicted across various regions, including parts of Florida, Fort Collins, and San Antonio, with some areas expecting heavy rainfall and potentially severe weather.