This week, multiple regions across the United States are experiencing extreme heat, with temperatures soaring above 100 degrees in several areas. Maryland is under a heat advisory with a heat index near 105 and potential thunderstorms, while Tropical Storm Debby threatens heavy rain and coastal flooding along the Southeast. Rapid City, S.D., and New Mexico face strong to severe storms and flash flooding, with temperatures cooling slightly later in the week. The South Plains and Dallas-Fort Worth will see temperatures peaking at 105 degrees, with slight relief expected by the weekend. Central Illinois will also endure oppressive heat, with a cool down anticipated midweek. The North Bay in California will hit 100 degrees, raising fire concerns.