People are urged not to burn debris or have outdoor fires and be cautious with materials that can spark a fire.

At least 9 million people in the nation's upper Midwest region are under red flag warnings on Monday, including residents of Minnesota, where a wildfire was already burning out of control in the largest national forest east of the Mississippi River.

Multiple Wisconsin counties, including Marinette, are under "Extreme" fire danger from the state Department of Natural Resources.