The weather in Mississippi could feel like 110°F into next week. Here's what to know about the heat wave, high humidity, how to stay cool and safe

Major cities across the United States are preparing for extreme temperatures caused by a heat dome that hit the U.S. Plains on Friday and is expected to expand to much of the rest of the country over the coming days.

Weather forecasters have warned of extreme and dangerous temperatures as a major heat wave sweeps across the central and eastern U.S. states.